gstack/test/fixtures/eng-completed-navigation-cab3.json

{
  "provenance": {
    "source": "cab3edc8b24f873b55f6edc6d98b60981eda52cb",
    "actualOutcome": "timeout; original paid verdict unchanged",
    "scope": "Exact public call/ACKs and reviewed task, lane and report sections; other report sections omitted for bounded fixture",
    "sourceHashes": {
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      "public-transcript.json": "e7f038a26c01bb78770d4b1b5ea32145251b9658289e3887a25307e152f592e1",
      "ownership.json": "49687f653dd8df9164fb66bfc94e80c2a7ba7c8823bfb1ca654c89642352cc1c",
      "original-shard.log": "cc409bfb82937c014d30b05228cb3176c528acf6c56b1a0ffc5fa07f20fdf9c8",
      "final-report.md": "ad044adff3258fd190536a08d9c8d2645772d5f4a234d4342ac917874901ecba",
      "terminal.screen.log": "1510a962502116b93dc6ecbff6d25cc444a5830618e1afb1c0dab32dfb238426"
    }
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  "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific\nfinding above. Run with Claude Code or Codex; checkbox as you ship.\n\n- [ ] **T1 (P1, human: ~3h / CC: ~10min)** \u2014 auth/router \u2014 Add `routeAuth()` with `AUTH_V2_ENABLED` kill switch and `AUTH_V2_TENANTS` allowlist; `legacyAuthFlow()` unchanged\n  - Surfaced by: Scope Challenge S4 / Architecture A3 (D4, D9)\n  - Files: `auth/router.ts`, `auth/router.test.ts`\n  - Verify: 4 routing branch tests green\n- [ ] **T2 (P1, human: ~4h / CC: ~15min)** \u2014 auth/AuthCache \u2014 Create facade over the existing adapter with `Reader` (`get`, `invalidate`) and `Writer` (`set`) interfaces; no module-level export\n  - Surfaced by: Architecture A1, A2 (D6, D7, D8)\n  - Files: `auth/AuthCache.ts`, `auth/AuthCache.test.ts`\n  - Verify: isolation + key + writer-only tests green; adapter tests untouched and green\n- [ ] **T3 (P1, human: ~1d / CC: ~30min)** \u2014 auth/AuthBroker \u2014 Implement with injected `Writer`; `validate()` returns `AuthResult`; `Promise.all` over 5 IDP calls with shared `AbortController` and 3 s deadline; composition root wires one cache\n  - Surfaced by: Architecture A1/A4, Code quality C1, Performance P1/P2 (D7, D10, D13, D14)\n  - Files: `auth/AuthBroker.ts`, `auth/AuthBroker.test.ts`, `auth/composition.ts`\n  - Verify: hit=0 calls; one-rejects; deadline; sibling-abort; elapsed\u2248max tests green\n- [ ] **T4 (P1, human: ~4h / CC: ~15min)** \u2014 auth/SessionMint \u2014 Implement with injected `Reader` only; return minted session to `AuthBroker` for storage\n  - Surfaced by: Architecture A2 (D8)\n  - Files: `auth/SessionMint.ts`, `auth/SessionMint.test.ts`\n  - Verify: type test (no `set`); late-mint-does-not-repopulate test green\n- [ ] **T5 (P1, human: ~1d / CC: ~20min)** \u2014 auth/validateAndDispatch \u2014 Split into `validate()` + `dispatch()`; map known errors to `AuthResult`; rethrow unknown; header diagram\n  - Surfaced by: Code quality C1 (D10)\n  - Files: `auth/validateAndDispatch.ts`, `auth/validateAndDispatch.test.ts`\n  - Verify: one test per variant + unknown-propagates + no-dispatch-on-non-ok green\n- [ ] **T6 (P1, human: ~1.5d / CC: ~30min)** \u2014 tests/parity \u2014 Write `authBehavior.contract.test.ts` parameterized over `legacyAuthFlow()` and `AuthBroker`\n  - Surfaced by: Test review T1 CRITICAL (D11)\n  - Files: `auth/authBehavior.contract.test.ts` (or `tests/`)\n  - Verify: six scenarios green for both implementations before any tenant is allowlisted\n- [ ] **T7 (P2, human: ~1d / CC: ~30min)** \u2014 tests/e2e \u2014 Write `auth.e2e.test.ts`: legacy login, v2 login, tenant suspension denial, kill-switch rollback mid-session\n  - Surfaced by: Test review T2 (D12)\n  - Files: `auth/auth.e2e.test.ts`\n  - Verify: 4 flows green against IDP stub in CI\n- [ ] **T8 (P2, human: ~1h / CC: ~5min)** \u2014 docs \u2014 Header ASCII diagrams in `AuthBroker.ts`, `validateAndDispatch.ts`, `router.ts`\n  - Surfaced by: Architecture A5, Code quality C4\n  - Files: `auth/AuthBroker.ts`, `auth/validateAndDispatch.ts`, `auth/router.ts`\n  - Verify: diagrams match the routing table and variant map\n- [ ] **T9 (P3, human: ~30min / CC: ~5min)** \u2014 TODOS.md \u2014 Create with the four approved entries below\n  - Surfaced by: Final planning decisions D15-D18\n  - Files: `TODOS.md`\n  - Verify: file matches TODOS-format (What/Why/Context/Effort/Priority)\n\nEffort assumption: tests ~50x, features ~30x, architecture ~5x human\u00f7CC ratios, adjusted down for a 3-component auth change.\n\nJSONL artifact: `~/.gstack/projects/gstack-plan-count-Sr94jU/tasks-eng-review-20260915-192142.jsonl` (9 tasks).\n\n## Worktree parallelization strategy\n\n| Step | Modules touched | Depends on |\n|---|---|---|\n| T5 `AuthResult` type + `validate/dispatch` split | auth/ (validateAndDispatch) | \u2014 |\n| T2 `AuthCache` facade | auth/ (AuthCache) | \u2014 |\n| T3 `AuthBroker` + composition root | auth/ | T2, T5 |\n| T4 `SessionMint` | auth/ | T2 |\n| T1 router + flags | auth/ (router) | T3 |\n| T6 parity suite | auth/__tests__ or tests/ | legacy only at first; T3 to parameterize |\n| T7 E2E | tests/e2e | T1, T3, T4 |\n| T8 diagrams | auth/ headers | T1, T3, T5 |\n| T9 TODOS.md | repo root | after plan mode exits |\n\nLanes:\n- Lane A: T5 \u2192 T2 \u2192 T3 + T4 \u2192 T1 \u2192 T8 (sequential, shared `auth/`)\n- Lane B: T6 parity suite written against `legacyAuthFlow()` (independent: tests/ only), then parameterized over `AuthBroker` after Lane A's T3 merges\n- Lane C: T7 E2E (after A and B merge)\n- T9 anywhere (root only)\n\nExecution: launch A and B in parallel worktrees. Merge both. Then C.\nConflict flag: if the parity suite is placed under `auth/` instead of `tests/`, Lanes A and B both touch `auth/`; keep it under `tests/` or `auth/__tests__/` to avoid the merge conflict.\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | \u2014 | \u2014 |\n| Outside Review | codex via `/plan-eng-review` (codex-plan-review) | Independent 2nd opinion | 1 | SKIPPED (disabled) | host=claude, outside_provider=codex, outside_status=disabled, phase=plan-review |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | CLEAR (PLAN) | 41 issues, 0 critical gaps |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | \u2014 | \u2014 |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | \u2014 | \u2014 |\n\n- **OUTSIDE COVERAGE:** codex, phase plan-review, disabled by `codex_reviews=disabled`; no outside findings. No native fallback dispatched (disabled is an opt-out). Re-enable with `gstack-config set codex_reviews enabled`.\n- **VERDICT:** ENG CLEARED \u2014 ready to implement (scope reduced: 3 components, strangler behind per-tenant flag, parity suite required before any tenant is allowlisted).\n\nNO UNRESOLVED DECISIONS\n",
  "call": {
    "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
    "toolUseId": "toolu_01V4dr38RG1aKzRWDx8weUqb",
    "questions": [
      {
        "question": "D19 \u2014 Next step after the engineering review?\nProject/branch/task: gstack-plan-count-Sr94jU @ main \u2014 reviewed PLAN.md \"Multi-tenant Auth Refactor\"; Eng Review CLEAR, 0 unresolved, 0 critical gaps.\nELI10: The plan now has every decision answered and a written test net. The only question left is whether to start building or first get a strategy-level second look. There is no UI in this change, so a design review has nothing to look at.\nStakes if we pick wrong: Starting without a CEO review risks building a well-engineered thing nobody prioritized; running one costs a session before any code lands.\nRecommendation: C because the scope was already challenged and reduced (D4-D6) inside this review, and every remedy landed at its recommended option (Lake Score 7/7).\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: strategy check vs. shipping momentum \u2014 the scope questions a CEO review asks were already answered here.",
        "header": "Next step",
        "multiSelect": false,
        "options": [
          {
            "label": "C) Ready to implement (recommended)",
            "description": "\u2705 Every D4-D14 remedy is approved and has a named test; T1-T9 are ordered with lanes\n\u2705 Parity suite (T6) gates the first allowlisted tenant, so rollout risk is bounded\n\u274c No strategy-level second opinion before code; outside (codex) review was disabled"
          },
          {
            "label": "B) Run /plan-ceo-review first",
            "description": "\u2705 Independent scope/strategy pass on whether this refactor is worth doing now at all\n\u2705 Could confirm or overturn the D4/D5 deferrals from a business angle\n\u274c Adds a session before any code; the review already cut scope 5\u21923 components"
          }
        ]
      }
    ],
    "answered": true,
    "failed": false,
    "answers": {
      "D19 \u2014 Next step after the engineering review?\nProject/branch/task: gstack-plan-count-Sr94jU @ main \u2014 reviewed PLAN.md \"Multi-tenant Auth Refactor\"; Eng Review CLEAR, 0 unresolved, 0 critical gaps.\nELI10: The plan now has every decision answered and a written test net. The only question left is whether to start building or first get a strategy-level second look. There is no UI in this change, so a design review has nothing to look at.\nStakes if we pick wrong: Starting without a CEO review risks building a well-engineered thing nobody prioritized; running one costs a session before any code lands.\nRecommendation: C because the scope was already challenged and reduced (D4-D6) inside this review, and every remedy landed at its recommended option (Lake Score 7/7).\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: strategy check vs. shipping momentum \u2014 the scope questions a CEO review asks were already answered here.": "C) Ready to implement (recommended)"
    },
    "unansweredQuestionIndices": [],
    "answeredAt": "2026-09-15T19:27:57.052Z"
  },
  "priorCalls": [
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01F8eabqQ2Fyi7nJ3GVBkAWW",
      "questions": [
        {
          "question": "D1 \u2014 Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: plan-review fixture repo on `main`, about to engineering-review PLAN.md (Multi-tenant Auth Refactor).\nELI10: gstack works best when your project's CLAUDE.md includes skill routing rules. Those rules tell Claude which skill to reach for when you say things like \"review this diff\" or \"help me ship\", so you don't have to remember slash-command names. Without them, you invoke skills manually every time.\nStakes if we pick wrong: mild either way. Skipping means more manual `/skill` typing; adding means a small committed edit to CLAUDE.md that you can revert.\nRecommendation: A because routing is a one-time, low-cost setup that makes every later session smoother.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNote: plan mode is active, so the CLAUDE.md edit and commit will happen after plan mode exits, not now.\nNet: a small config edit now vs. remembering skill names by hand later.",
          "header": "Routing",
          "multiSelect": false,
          "options": [
            {
              "label": "Add routing rules to CLAUDE.md (recommended)",
              "description": "\u2705 Natural-language requests like \"review this\" auto-route to the right gstack skill\n\u2705 One-time setup, committed so teammates get the same behavior\n\u274c Adds a committed section to CLAUDE.md that you may need to tune later"
            },
            {
              "label": "No thanks, I'll invoke skills manually",
              "description": "\u2705 CLAUDE.md stays untouched; nothing gets committed on your behalf\n\u2705 Full control over when each skill runs\n\u274c You'll type slash commands yourself; this prompt won't reappear for this project"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D1 \u2014 Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: plan-review fixture repo on `main`, about to engineering-review PLAN.md (Multi-tenant Auth Refactor).\nELI10: gstack works best when your project's CLAUDE.md includes skill routing rules. Those rules tell Claude which skill to reach for when you say things like \"review this diff\" or \"help me ship\", so you don't have to remember slash-command names. Without them, you invoke skills manually every time.\nStakes if we pick wrong: mild either way. Skipping means more manual `/skill` typing; adding means a small committed edit to CLAUDE.md that you can revert.\nRecommendation: A because routing is a one-time, low-cost setup that makes every later session smoother.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNote: plan mode is active, so the CLAUDE.md edit and commit will happen after plan mode exits, not now.\nNet: a small config edit now vs. remembering skill names by hand later.": "Add routing rules to CLAUDE.md (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:09:04.787Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_015BtesnZWoAyLRUQRSN3eAg",
      "questions": [
        {
          "question": "D2 \u2014 Run /office-hours first, or go straight to the engineering review?\nProject/branch/task: `main` in the plan-review fixture; reviewing PLAN.md \"Multi-tenant Auth Refactor\".\nELI10: No design doc found for this branch. `/office-hours` produces a structured problem statement, premise challenge, and explored alternatives \u2014 it gives this review much sharper input to work with. Takes about 10 minutes (human: ~1 hr / CC: ~10 min). The design doc is per-feature, not per-product \u2014 it captures the thinking behind this specific change. Without it, the review judges the plan on what's written, which here is thin on the \"why\" (why two services, why a shared cache, why rewrite legacyAuthFlow).\nStakes if we pick wrong: skipping risks reviewing the wrong premise (e.g. optimizing a shared-cache design that shouldn't exist); running it costs ~10 minutes before any findings land.\nRecommendation: B because the plan already names concrete, reviewable engineering defects (shared mutable cache, swallowed errors, no regression test, sequential IDP calls) and the request asks for a thorough review of this plan as written; the premise questions can be raised inside the review.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: sharper premise input later vs. actionable engineering findings now.",
          "header": "Prereq",
          "multiSelect": false,
          "options": [
            {
              "label": "Skip \u2014 proceed with standard review (recommended)",
              "description": "\u2705 Findings on the four named defects land now, no detour\n\u2705 Premise questions (why two services, why shared cache) still get raised as review findings\n\u274c No structured problem statement to anchor the architecture recommendation against"
            },
            {
              "label": "Run /office-hours now",
              "description": "\u2705 Produces a problem statement and explored alternatives before we lock architecture\n\u2705 Catches a wrong premise (e.g. the shared AuthCache) before it becomes a finding to argue about\n\u274c ~10 min delay before the engineering review starts; more questions to answer up front"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D2 \u2014 Run /office-hours first, or go straight to the engineering review?\nProject/branch/task: `main` in the plan-review fixture; reviewing PLAN.md \"Multi-tenant Auth Refactor\".\nELI10: No design doc found for this branch. `/office-hours` produces a structured problem statement, premise challenge, and explored alternatives \u2014 it gives this review much sharper input to work with. Takes about 10 minutes (human: ~1 hr / CC: ~10 min). The design doc is per-feature, not per-product \u2014 it captures the thinking behind this specific change. Without it, the review judges the plan on what's written, which here is thin on the \"why\" (why two services, why a shared cache, why rewrite legacyAuthFlow).\nStakes if we pick wrong: skipping risks reviewing the wrong premise (e.g. optimizing a shared-cache design that shouldn't exist); running it costs ~10 minutes before any findings land.\nRecommendation: B because the plan already names concrete, reviewable engineering defects (shared mutable cache, swallowed errors, no regression test, sequential IDP calls) and the request asks for a thorough review of this plan as written; the premise questions can be raised inside the review.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: sharper premise input later vs. actionable engineering findings now.": "Skip \u2014 proceed with standard review (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:09:46.891Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_016BUDCfWHiQPEHwN4TYJhhx",
      "questions": [
        {
          "question": "D3 \u2014 Enable cross-project learnings search?\nProject/branch/task: `main`, plan-eng-review of PLAN.md (Multi-tenant Auth Refactor); first-time setting.\nELI10: gstack can search learnings from your other projects on this machine to find patterns that might apply here. This stays local (no data leaves your machine). Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: enabling on a multi-client machine could surface one client's patterns while reviewing another's; disabling on a solo machine just means fewer prior learnings applied to this review.\nRecommendation: A because this is a local-only search and reusing past pitfalls makes reviews sharper over time.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: broader recall of past learnings vs. strict per-project isolation.",
          "header": "Learnings",
          "multiSelect": false,
          "options": [
            {
              "label": "Enable cross-project learnings (recommended)",
              "description": "\u2705 Past pitfalls from any project on this machine can inform this review\n\u2705 Stays local; nothing leaves the machine, and you can flip it back any time\n\u274c On a multi-client machine, patterns from one codebase may surface in another"
            },
            {
              "label": "Keep learnings project-scoped only",
              "description": "\u2705 Strict isolation between codebases; no cross-client leakage\n\u2705 Simplest mental model: what this repo taught is all that gets recalled here\n\u274c Fewer prior learnings applied; this fresh fixture repo currently has zero of its own"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D3 \u2014 Enable cross-project learnings search?\nProject/branch/task: `main`, plan-eng-review of PLAN.md (Multi-tenant Auth Refactor); first-time setting.\nELI10: gstack can search learnings from your other projects on this machine to find patterns that might apply here. This stays local (no data leaves your machine). Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: enabling on a multi-client machine could surface one client's patterns while reviewing another's; disabling on a solo machine just means fewer prior learnings applied to this review.\nRecommendation: A because this is a local-only search and reusing past pitfalls makes reviews sharper over time.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: broader recall of past learnings vs. strict per-project isolation.": "Enable cross-project learnings (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:10:49.047Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_015h3j6kXSbuLjXAJcKEek4T",
      "questions": [
        {
          "question": "D4 \u2014 Keep the legacyAuthFlow() rewrite in this PR, or strangle it?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge feature cut #1 of 2.\nELI10: The plan rewrites the existing `legacyAuthFlow()` in the same change that adds AuthBroker and SessionMint (PLAN.md:27-28), and the planned tests deliberately skip it (PLAN.md:14-16). That means the one code path every current user logs in through gets replaced with zero proof it still behaves the same. A strangler approach lands the new services first, routes traffic to them behind a flag, and rewrites the legacy path as its own step once a regression suite exists.\nStakes if we pick wrong: a rewrite-in-place with no net means a login regression shows up in production for every tenant at once, with no flag to flip back. Deferring too long means two auth paths live side by side for a while.\nRecommendation: B because it makes the change reversible (flag flip) and separates structural change from behavioral change (Beck); the regression suite this review will require lands before the rewrite, not after. (human: ~2 days / CC: ~30 min for the flag + routing.)\nNote: options differ in kind, not coverage \u2014 no completeness score. Whichever you choose, regression coverage for legacyAuthFlow() is still required and is decided separately in the Test review.\nNet: one big-bang swap vs. two smaller reversible steps.",
          "header": "Legacy flow",
          "multiSelect": false,
          "options": [
            {
              "label": "Defer rewrite: strangler behind a flag (recommended)",
              "description": "\u2705 New services ship with a rollback switch; legacy path stays live until proven replaceable\n\u2705 Regression suite is written against the running legacy code, then the rewrite has a target to hit\n\u274c Two auth paths coexist for one release; flag and routing code must be removed later"
            },
            {
              "label": "Include: rewrite legacyAuthFlow() in this PR",
              "description": "\u2705 One PR, one review, no temporary dual-path code to clean up\n\u2705 Callers move to the new services immediately, no flag plumbing\n\u274c No rollback short of revert; regression tests must be written from the old code before it is deleted"
            },
            {
              "label": "Cut: do not touch legacyAuthFlow() at all",
              "description": "\u2705 Smallest possible diff; zero risk to the current login path\n\u2705 New services can still be built and tested in isolation\n\u274c Refactor goal is not met; legacy path never converges on the new architecture"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D4 \u2014 Keep the legacyAuthFlow() rewrite in this PR, or strangle it?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge feature cut #1 of 2.\nELI10: The plan rewrites the existing `legacyAuthFlow()` in the same change that adds AuthBroker and SessionMint (PLAN.md:27-28), and the planned tests deliberately skip it (PLAN.md:14-16). That means the one code path every current user logs in through gets replaced with zero proof it still behaves the same. A strangler approach lands the new services first, routes traffic to them behind a flag, and rewrites the legacy path as its own step once a regression suite exists.\nStakes if we pick wrong: a rewrite-in-place with no net means a login regression shows up in production for every tenant at once, with no flag to flip back. Deferring too long means two auth paths live side by side for a while.\nRecommendation: B because it makes the change reversible (flag flip) and separates structural change from behavioral change (Beck); the regression suite this review will require lands before the rewrite, not after. (human: ~2 days / CC: ~30 min for the flag + routing.)\nNote: options differ in kind, not coverage \u2014 no completeness score. Whichever you choose, regression coverage for legacyAuthFlow() is still required and is decided separately in the Test review.\nNet: one big-bang swap vs. two smaller reversible steps.": "Defer rewrite: strangler behind a flag (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:12:08.784Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_015i5ZEUdgJWPyGW337YXLER",
      "questions": [
        {
          "question": "D5 \u2014 Keep RequestPolicy as a new class in this PR?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge feature cut #2 of 2.\nELI10: The plan lists `RequestPolicy` among the four new classes (PLAN.md:35-36) but never says what it does, who calls it, or what data it holds. The only \"policy\" the plan mentions is the existing adapter's policy version key (PLAN.md:8). An unexplained class in an auth refactor is either a real need the plan forgot to write down, or speculative structure. The review cannot design tests or failure modes for a component with no stated contract.\nStakes if we pick wrong: include it blind and you ship an untested abstraction in the auth path; cut it and, if it was load-bearing, the work resurfaces mid-implementation as an unplanned change.\nRecommendation: B because the plan gives no contract to review; deferring keeps the door open (add it back with a one-paragraph responsibility statement) without shipping unspecified auth code. (human: ~1 day / CC: ~10 min to write the responsibility statement if it comes back.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: speculative structure now vs. a defined component later.",
          "header": "RequestPolicy",
          "multiSelect": false,
          "options": [
            {
              "label": "Defer until its responsibility is written down (recommended)",
              "description": "\u2705 Nothing unspecified ships in the auth path; one fewer class in a 5-component change\n\u2705 Easy to reinstate: a short contract paragraph and it re-enters the plan\n\u274c If it was needed for the flag routing or tenant policy checks, that surfaces as a mid-build addition"
            },
            {
              "label": "Include: keep RequestPolicy, I'll define it",
              "description": "\u2705 Avoids a second planning pass if you already know what it owns\n\u2705 Tests and failure modes for it get covered in this review once you state its contract\n\u274c Review has to pause for you to supply the responsibility, inputs and callers now"
            },
            {
              "label": "Cut: remove RequestPolicy from the plan entirely",
              "description": "\u2705 Cleanest reduction; the four remaining components each have a stated role\n\u2705 No follow-up decision to track\n\u274c If tenant-level policy logic is needed, it lands inside AuthBroker instead of its own unit"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D5 \u2014 Keep RequestPolicy as a new class in this PR?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge feature cut #2 of 2.\nELI10: The plan lists `RequestPolicy` among the four new classes (PLAN.md:35-36) but never says what it does, who calls it, or what data it holds. The only \"policy\" the plan mentions is the existing adapter's policy version key (PLAN.md:8). An unexplained class in an auth refactor is either a real need the plan forgot to write down, or speculative structure. The review cannot design tests or failure modes for a component with no stated contract.\nStakes if we pick wrong: include it blind and you ship an untested abstraction in the auth path; cut it and, if it was load-bearing, the work resurfaces mid-implementation as an unplanned change.\nRecommendation: B because the plan gives no contract to review; deferring keeps the door open (add it back with a one-paragraph responsibility statement) without shipping unspecified auth code. (human: ~1 day / CC: ~10 min to write the responsibility statement if it comes back.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: speculative structure now vs. a defined component later.": "Defer until its responsibility is written down (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:12:24.841Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01TapUQ8xuvA9xXgVB1nAWtm",
      "questions": [
        {
          "question": "D6 \u2014 Component arrangement: keep TokenStore as a separate class, or fold it into AuthCache?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge structure choice (feature choices held fixed: legacy rewrite deferred behind a flag per D4, RequestPolicy deferred per D5).\nELI10: With RequestPolicy deferred, the plan still adds four components: AuthBroker, SessionMint, AuthCache, and TokenStore. The plan says AuthCache is a facade over the existing cache adapter, which already stores tokens keyed by tenant/issuer/audience/policy and already handles eviction and invalidation (PLAN.md:7-13). That makes TokenStore a third layer doing the adapter's job. This question picks structure only: how many boxes. Whether the shared AuthCache stays a module-level global (Section 1) and how errors and IDP calls are handled are separate decisions and stay pending in every option.\nStakes if we pick wrong: too many layers means three places to look when a tenant's revoked token still validates at 3am; too few means AuthBroker and SessionMint tangle if their responsibilities really are distinct.\nRecommendation: A because it removes the one component whose job the existing adapter already does, keeps the two services whose names describe distinct work, and preserves every retained contract from PLAN.md:6-13 unchanged. (human: ~0.5 day less / CC: ~5 min less.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: the existing adapter is already the token store; the question is whether you want a second one.",
          "header": "Structure",
          "multiSelect": false,
          "options": [
            {
              "label": "3 components: AuthBroker, SessionMint, AuthCache; drop TokenStore (recommended)",
              "description": "\u2705 AuthCache facade + existing adapter is the single token store; one place for invalidation bugs\n\u2705 Two services with distinct names keep brokering and minting separable and testable\n\u274c If TokenStore was meant to hold something the adapter cannot (e.g. refresh-token secrets), that need has to be named and added to AuthCache"
            },
            {
              "label": "4 components: keep TokenStore separate (original)",
              "description": "\u2705 Matches the plan as written; no re-scoping of what AuthCache owns\n\u2705 Room for TokenStore to own a distinct persistence concern if one exists\n\u274c Three storage layers (adapter, AuthCache, TokenStore) with no stated boundary between the last two"
            },
            {
              "label": "2 components: one AuthService (broker+mint) + AuthCache",
              "description": "\u2705 Fewest moving parts; one service to inject the cache into\n\u2705 Simplest wiring for the D4 flag routing\n\u274c Merges two responsibilities the plan deliberately separated; AuthService grows into the next 60-line validateAndDispatch()"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D6 \u2014 Component arrangement: keep TokenStore as a separate class, or fold it into AuthCache?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Scope Challenge structure choice (feature choices held fixed: legacy rewrite deferred behind a flag per D4, RequestPolicy deferred per D5).\nELI10: With RequestPolicy deferred, the plan still adds four components: AuthBroker, SessionMint, AuthCache, and TokenStore. The plan says AuthCache is a facade over the existing cache adapter, which already stores tokens keyed by tenant/issuer/audience/policy and already handles eviction and invalidation (PLAN.md:7-13). That makes TokenStore a third layer doing the adapter's job. This question picks structure only: how many boxes. Whether the shared AuthCache stays a module-level global (Section 1) and how errors and IDP calls are handled are separate decisions and stay pending in every option.\nStakes if we pick wrong: too many layers means three places to look when a tenant's revoked token still validates at 3am; too few means AuthBroker and SessionMint tangle if their responsibilities really are distinct.\nRecommendation: A because it removes the one component whose job the existing adapter already does, keeps the two services whose names describe distinct work, and preserves every retained contract from PLAN.md:6-13 unchanged. (human: ~0.5 day less / CC: ~5 min less.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: the existing adapter is already the token store; the question is whether you want a second one.": "3 components: AuthBroker, SessionMint, AuthCache; drop TokenStore (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:12:46.916Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01CjHZ6XGvnXovd8H7UAACeZ",
      "questions": [
        {
          "question": "D7 \u2014 How should AuthBroker and SessionMint get their AuthCache: injected instance or module-level global?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A1 (PLAN.md:19-20), ledger row R1.\nELI10: Right now the plan has both new services `import` one shared AuthCache object that lives at the top of a module. That works until a test wants a fresh cache, two copies of the package get installed, or someone needs to know who else is touching the cache. Injecting the one instance through each service's constructor from a single composition root keeps exactly one backing cache (the contract at PLAN.md:12 stays) but makes the dependency visible and swappable. Concurrent-write safety (R2) and flag granularity (R3) stay pending in both options.\nStakes if we pick wrong: with the global, a test that pollutes the cache silently affects the next test file, and a production bug where tenant A's entry appears in tenant B's request has no obvious owner to trace.\nRecommendation: A because it is the standard fix [Layer 1], costs one constructor parameter per service, and makes the R2 safety work testable with a fake cache. (human: ~2h / CC: ~5 min.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: one extra constructor argument vs. hidden shared state in the auth path.",
          "header": "R1 wiring",
          "multiSelect": false,
          "options": [
            {
              "label": "Inject one AuthCache instance via constructors (recommended)",
              "description": "\u2705 Tests construct a fresh cache per case; no cross-file leakage under Vitest/Jest workers\n\u2705 Dependency is explicit at the call site; composition root is the one place the cache is created\n\u274c Every place that instantiates AuthBroker or SessionMint must pass the cache (one composition root plus tests)"
            },
            {
              "label": "Keep the module-level export (as planned)",
              "description": "\u2705 Zero wiring changes; services import and go\n\u2705 Matches the plan text exactly, no re-plan\n\u274c Test isolation depends on module-cache resets; two writers on an invisible global is the exact pattern that produced A2"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D7 \u2014 How should AuthBroker and SessionMint get their AuthCache: injected instance or module-level global?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A1 (PLAN.md:19-20), ledger row R1.\nELI10: Right now the plan has both new services `import` one shared AuthCache object that lives at the top of a module. That works until a test wants a fresh cache, two copies of the package get installed, or someone needs to know who else is touching the cache. Injecting the one instance through each service's constructor from a single composition root keeps exactly one backing cache (the contract at PLAN.md:12 stays) but makes the dependency visible and swappable. Concurrent-write safety (R2) and flag granularity (R3) stay pending in both options.\nStakes if we pick wrong: with the global, a test that pollutes the cache silently affects the next test file, and a production bug where tenant A's entry appears in tenant B's request has no obvious owner to trace.\nRecommendation: A because it is the standard fix [Layer 1], costs one constructor parameter per service, and makes the R2 safety work testable with a fake cache. (human: ~2h / CC: ~5 min.)\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: one extra constructor argument vs. hidden shared state in the auth path.": "Inject one AuthCache instance via constructors (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:13:46.640Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_019FNhKdoooqX66Vw6sewBjy",
      "questions": [
        {
          "question": "D8 \u2014 How do two services write to one AuthCache without a revoked token coming back to life?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A2 (PLAN.md:10 + :20), ledger row R2.\nELI10: The plan says the adapter does not serialize mutations and that both new services mutate the cache. Picture it: an admin suspends a tenant, the invalidation hook clears that tenant's entries, and a millisecond later SessionMint finishes an in-flight mint and writes the entry back. The suspended tenant's token now validates until it expires. This is the classic lost-invalidation race. Two fixes: only one service ever writes (the other asks it to), or every write proves it saw the latest invalidation (a generation counter in the facade, rejected if stale). The adapter and its hooks stay untouched in every option.\nStakes if we pick wrong: a security bug (suspended or revoked tenant still authenticates) that only reproduces under concurrency and never in a unit test.\nRecommendation: A because it is explicit over clever: one writer means the race cannot occur by construction, no counters to reason about, and the failure mode is visible in the type signature (SessionMint has no `set`). Option B is correct but adds a concurrency primitive that a tired human at 3am has to understand. (A: human ~4h / CC ~15 min. B: human ~1 day / CC ~30 min.)\nCompleteness: A=10/10, B=10/10, C=3/10\nNet: eliminate the race structurally vs. detect it per write vs. leave it in.",
          "header": "R2 writes",
          "multiSelect": false,
          "options": [
            {
              "label": "Single writer: only AuthBroker writes to AuthCache (recommended)",
              "description": "\u2705 Lost-invalidation race is impossible by construction; nothing to reason about under load\n\u2705 SessionMint's API cannot mutate the cache, so the guarantee is visible in the types and enforced at compile time\n\u274c SessionMint must hand minted sessions to AuthBroker for storage, one extra call and one extra unit test seam"
            },
            {
              "label": "Generation-checked writes: set(key, value, gen) rejects stale gens",
              "description": "\u2705 Both services keep write access; race is detected and the stale write dropped\n\u2705 Generalizes if a third writer ever appears\n\u274c A per-key generation counter in the facade is new concurrency machinery in the auth path; harder to test and debug than no shared writes"
            },
            {
              "label": "Do nothing: two unordered writers (as planned)",
              "description": "\u2705 No change to the plan; smallest diff\n\u2705 Adapter behavior identical to today\n\u274c Revoked or suspended tenant tokens can be re-cached by a late write; no test can reliably catch it"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D8 \u2014 How do two services write to one AuthCache without a revoked token coming back to life?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A2 (PLAN.md:10 + :20), ledger row R2.\nELI10: The plan says the adapter does not serialize mutations and that both new services mutate the cache. Picture it: an admin suspends a tenant, the invalidation hook clears that tenant's entries, and a millisecond later SessionMint finishes an in-flight mint and writes the entry back. The suspended tenant's token now validates until it expires. This is the classic lost-invalidation race. Two fixes: only one service ever writes (the other asks it to), or every write proves it saw the latest invalidation (a generation counter in the facade, rejected if stale). The adapter and its hooks stay untouched in every option.\nStakes if we pick wrong: a security bug (suspended or revoked tenant still authenticates) that only reproduces under concurrency and never in a unit test.\nRecommendation: A because it is explicit over clever: one writer means the race cannot occur by construction, no counters to reason about, and the failure mode is visible in the type signature (SessionMint has no `set`). Option B is correct but adds a concurrency primitive that a tired human at 3am has to understand. (A: human ~4h / CC ~15 min. B: human ~1 day / CC ~30 min.)\nCompleteness: A=10/10, B=10/10, C=3/10\nNet: eliminate the race structurally vs. detect it per write vs. leave it in.": "Single writer: only AuthBroker writes to AuthCache (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:14:18.264Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01BcPYPmiYjHkJB7d7WH7PNa",
      "questions": [
        {
          "question": "D9 \u2014 What shape is the strangler flag: per-tenant allowlist with a kill switch, or one global boolean?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A3, ledger row R3 (D4 approved \"a flag\", shape undecided).\nELI10: D4 put the new AuthBroker/SessionMint path behind a flag with legacyAuthFlow() still live. The flag can be one switch for everyone, or a list of tenant IDs that get the new path plus a global off switch. This is a multi-tenant system: a per-tenant list lets you turn on one internal tenant, watch it, then widen. A global boolean is all-or-nothing.\nStakes if we pick wrong: a global flip that goes wrong logs out every tenant at once; a per-tenant list is a few more lines of config parsing and one more test.\nRecommendation: A because reversibility and canaries are the whole point of the strangler (D4), and the tenant ID is already on every request path per the cache key contract (PLAN.md:7). (A: human ~3h / CC ~10 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=6/10\nNet: canary by tenant vs. one big switch.",
          "header": "R3 flag",
          "multiSelect": false,
          "options": [
            {
              "label": "Per-tenant allowlist + global kill switch (recommended)",
              "description": "\u2705 Roll out to one internal tenant first; widen tenant by tenant with the legacy path untouched for the rest\n\u2705 Kill switch overrides the list, so rollback is one env var regardless of how many tenants are enabled\n\u274c Two config values to document and parse; one more routing test (tenant in list, not in list, kill switch on)"
            },
            {
              "label": "Single global boolean",
              "description": "\u2705 Simplest routing: one `if`, one env var, one test\n\u2705 Good enough if there is exactly one tenant in the first environment you enable it in\n\u274c Turning it on is a fleet-wide switch; a bug affects every tenant at once, which is what D4 was trying to avoid"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D9 \u2014 What shape is the strangler flag: per-tenant allowlist with a kill switch, or one global boolean?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Architecture finding A3, ledger row R3 (D4 approved \"a flag\", shape undecided).\nELI10: D4 put the new AuthBroker/SessionMint path behind a flag with legacyAuthFlow() still live. The flag can be one switch for everyone, or a list of tenant IDs that get the new path plus a global off switch. This is a multi-tenant system: a per-tenant list lets you turn on one internal tenant, watch it, then widen. A global boolean is all-or-nothing.\nStakes if we pick wrong: a global flip that goes wrong logs out every tenant at once; a per-tenant list is a few more lines of config parsing and one more test.\nRecommendation: A because reversibility and canaries are the whole point of the strangler (D4), and the tenant ID is already on every request path per the cache key contract (PLAN.md:7). (A: human ~3h / CC ~10 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=6/10\nNet: canary by tenant vs. one big switch.": "Per-tenant allowlist + global kill switch (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:14:59.919Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01ELUcYLwUeDZm9Qrw1cLb6c",
      "questions": [
        {
          "question": "D10 \u2014 Rewrite validateAndDispatch() with explicit error outcomes, or just add logging to the three catches?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Code quality finding C1 (PLAN.md:23-24), ledger row R4.\nELI10: Today three nested try/catch blocks each quietly eat one kind of error. An expired token, a revoked one, and an unreachable identity provider all vanish into the same silence, and whatever runs after the catches may proceed as if nothing happened. The fix is to split the function: `validate()` returns a typed result (ok / expired / revoked / idp_unreachable) and rethrows anything it does not recognize, then `dispatch()` branches on that result. The user gets a specific failure, and an unknown bug crashes loudly instead of being swallowed.\nStakes if we pick wrong: with swallowed errors, an IDP outage can look like \"everyone's token is invalid\" (or worse, dispatch runs on an unvalidated request) and nobody finds out until a tenant complains.\nRecommendation: A because it is explicit over clever, kills the error-hiding anti-pattern at the root, and each outcome gets its own test. The plan's own 5-call IDP path (Section 4) needs the idp_unreachable variant anyway. (A: human ~1 day / CC ~20 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=5/10, C=1/10\nNet: typed outcomes and loud unknowns vs. the same silence with log lines.",
          "header": "R4 errors",
          "multiSelect": false,
          "options": [
            {
              "label": "Split into validate() + dispatch() with a typed AuthResult (recommended)",
              "description": "\u2705 Every known error class becomes a visible outcome the caller and the user can act on\n\u2705 Unknown errors propagate, so a real bug surfaces in monitoring instead of being eaten\n\u274c Touches every caller of validateAndDispatch() to branch on the result (bounded: it is one function)"
            },
            {
              "label": "Keep the nesting, add a log line per catch",
              "description": "\u2705 Smallest diff; the swallowed errors at least show up in logs\n\u2705 No caller changes\n\u274c Behavior still silently continues after failure; three nested blocks remain the next person's problem"
            },
            {
              "label": "Do nothing (as planned)",
              "description": "\u2705 Zero effort now\n\u2705 No risk of changing current caller behavior\n\u274c Error hiding stays in the auth path; failures are invisible to users and operators"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D10 \u2014 Rewrite validateAndDispatch() with explicit error outcomes, or just add logging to the three catches?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Code quality finding C1 (PLAN.md:23-24), ledger row R4.\nELI10: Today three nested try/catch blocks each quietly eat one kind of error. An expired token, a revoked one, and an unreachable identity provider all vanish into the same silence, and whatever runs after the catches may proceed as if nothing happened. The fix is to split the function: `validate()` returns a typed result (ok / expired / revoked / idp_unreachable) and rethrows anything it does not recognize, then `dispatch()` branches on that result. The user gets a specific failure, and an unknown bug crashes loudly instead of being swallowed.\nStakes if we pick wrong: with swallowed errors, an IDP outage can look like \"everyone's token is invalid\" (or worse, dispatch runs on an unvalidated request) and nobody finds out until a tenant complains.\nRecommendation: A because it is explicit over clever, kills the error-hiding anti-pattern at the root, and each outcome gets its own test. The plan's own 5-call IDP path (Section 4) needs the idp_unreachable variant anyway. (A: human ~1 day / CC ~20 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=5/10, C=1/10\nNet: typed outcomes and loud unknowns vs. the same silence with log lines.": "Split into validate() + dispatch() with a typed AuthResult (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:15:49.638Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01883QhrD7Kj2L9VaRRpGBFy",
      "questions": [
        {
          "question": "D11 \u2014 How do we cover legacyAuthFlow() against regression: a shared parity suite, a characterization suite, or a router pass-through test?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Test review finding T1 CRITICAL (PLAN.md:14-16, :27-28), ledger row R5.\nELI10: The plan says the new tests will not touch legacyAuthFlow() at all. After D4 it is untouched code, but every current login now reaches it through a new router, and the whole point of the strangler is to later replace it with AuthBroker. A parity suite is one set of scenario tests (valid token, expired, revoked, tenant suspended, IDP down) run against BOTH implementations: it pins today's behavior now and becomes the acceptance test for the rewrite later. A characterization suite pins legacy only. A pass-through test only proves the router forwards calls.\nStakes if we pick wrong: a login regression for every tenant with nothing that would have caught it; or a rewrite later with no target to hit.\nRecommendation: A because it is the complete version and costs almost nothing extra with CC: the same five scenarios must be written for AuthBroker anyway, so running them against legacy too is a fixture parameter, not a second suite. (A: human ~1.5 days / CC ~30 min. B: human ~1 day / CC ~20 min. C: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=8/10, C=4/10\nNet: one suite that guards today and specifies tomorrow vs. a snapshot of today vs. proof the router forwards.",
          "header": "R5 regress",
          "multiSelect": false,
          "options": [
            {
              "label": "Shared parity suite run against legacy AND AuthBroker (recommended)",
              "description": "\u2705 Pins current legacy behavior and doubles as the acceptance test for the deferred rewrite\n\u2705 Divergence between the two paths shows up as a red test before any tenant is switched over\n\u274c Scenarios must be written as implementation-agnostic fixtures (inputs, expected outcome, expected cache key)"
            },
            {
              "label": "Characterization suite for legacyAuthFlow() only",
              "description": "\u2705 Pins today's outcomes and cache writes for every scenario\n\u2705 No coupling to AuthBroker's test shape\n\u274c Written once for legacy, then rewritten again for the rewrite; parity is never asserted"
            },
            {
              "label": "Router pass-through test only",
              "description": "\u2705 Minimal: proves the router forwards args and returns the legacy result\n\u2705 Fast to write\n\u274c Says nothing about what legacyAuthFlow() actually does; the rewrite starts with no net"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D11 \u2014 How do we cover legacyAuthFlow() against regression: a shared parity suite, a characterization suite, or a router pass-through test?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Test review finding T1 CRITICAL (PLAN.md:14-16, :27-28), ledger row R5.\nELI10: The plan says the new tests will not touch legacyAuthFlow() at all. After D4 it is untouched code, but every current login now reaches it through a new router, and the whole point of the strangler is to later replace it with AuthBroker. A parity suite is one set of scenario tests (valid token, expired, revoked, tenant suspended, IDP down) run against BOTH implementations: it pins today's behavior now and becomes the acceptance test for the rewrite later. A characterization suite pins legacy only. A pass-through test only proves the router forwards calls.\nStakes if we pick wrong: a login regression for every tenant with nothing that would have caught it; or a rewrite later with no target to hit.\nRecommendation: A because it is the complete version and costs almost nothing extra with CC: the same five scenarios must be written for AuthBroker anyway, so running them against legacy too is a fixture parameter, not a second suite. (A: human ~1.5 days / CC ~30 min. B: human ~1 day / CC ~20 min. C: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=8/10, C=4/10\nNet: one suite that guards today and specifies tomorrow vs. a snapshot of today vs. proof the router forwards.": "Shared parity suite run against legacy AND AuthBroker (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:16:47.399Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01XWBWagRJ56q2WJ8cfyod2j",
      "questions": [
        {
          "question": "D12 \u2014 Add four end-to-end tests for the flagged auth flows, or stop at unit + integration?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Test review finding T2, ledger row R7. Unit/integration tests for D7-D11 are already approved work; this only decides E2E depth.\nELI10: Unit tests prove each piece works with fakes. The four flows here span router \u2192 service \u2192 cache \u2192 adapter \u2192 IDP, and auth is the one place where mocks hiding a real wiring mistake costs the most. The four E2E cases: a tenant off the list logs in (legacy), a tenant on the list logs in (AuthBroker), an admin suspends a tenant and the next request is denied, and the kill switch is flipped while sessions are live and legacy takes over cleanly.\nStakes if we pick wrong: a wiring bug (wrong cache injected, router reads the wrong env var) passes every unit test and fails in the first environment you enable it in.\nRecommendation: A because the E2E decision matrix names auth flows as too important for unit tests alone, and the strangler rollout depends on the kill-switch flow working the first time it is needed. (A: human ~1 day / CC ~30 min. B: no extra work.)\nCompleteness: A=10/10, B=7/10\nNet: proof the assembled system routes and rolls back vs. proof each part works alone.",
          "header": "R7 E2E",
          "multiSelect": false,
          "options": [
            {
              "label": "Add the 4 E2E flows (recommended)",
              "description": "\u2705 Catches composition-root and env-var wiring mistakes that fakes cannot see\n\u2705 Kill-switch rollback is rehearsed in CI before it is ever needed in production\n\u274c Needs an IDP stub or sandbox reachable from CI; slower than the unit suite"
            },
            {
              "label": "Unit + integration only",
              "description": "\u2705 No E2E infrastructure to stand up; faster CI\n\u2705 Parity suite (D11) and per-branch router tests still cover the logic\n\u274c Wiring across router/service/cache/adapter is never exercised as one system before rollout"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D12 \u2014 Add four end-to-end tests for the flagged auth flows, or stop at unit + integration?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Test review finding T2, ledger row R7. Unit/integration tests for D7-D11 are already approved work; this only decides E2E depth.\nELI10: Unit tests prove each piece works with fakes. The four flows here span router \u2192 service \u2192 cache \u2192 adapter \u2192 IDP, and auth is the one place where mocks hiding a real wiring mistake costs the most. The four E2E cases: a tenant off the list logs in (legacy), a tenant on the list logs in (AuthBroker), an admin suspends a tenant and the next request is denied, and the kill switch is flipped while sessions are live and legacy takes over cleanly.\nStakes if we pick wrong: a wiring bug (wrong cache injected, router reads the wrong env var) passes every unit test and fails in the first environment you enable it in.\nRecommendation: A because the E2E decision matrix names auth flows as too important for unit tests alone, and the strangler rollout depends on the kill-switch flow working the first time it is needed. (A: human ~1 day / CC ~30 min. B: no extra work.)\nCompleteness: A=10/10, B=7/10\nNet: proof the assembled system routes and rolls back vs. proof each part works alone.": "Add the 4 E2E flows (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:17:21.061Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01Q2SwRVPjPb6aPoo4G8o3Md",
      "questions": [
        {
          "question": "D13 \u2014 Parallelize the 5 IDP calls with Promise.all?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P1 (PLAN.md:31-32), ledger row R6. Timeout and cancellation are a separate row (R8) and stay pending here.\nELI10: On every cache miss, token validation asks the identity provider five questions one after another. The plan says the five are independent, so they can be asked at the same time and the wait drops from the sum of five round trips to the slowest single one. Because auth needs all five answers, `Promise.all` (fail if any fails) is the right aggregator, not `allSettled`; a failure maps to the `idp_unreachable` outcome approved in D10.\nStakes if we pick wrong: leaving it sequential means every first login per tenant per policy version pays ~5x latency; parallelizing without verifying independence would be the real risk, but the plan states they are independent (verify during implementation).\nRecommendation: A because the plan itself calls it trivial, the calls are stated independent, and the win is a straight ~5x on cold-cache logins. (A: human ~2h / CC ~10 min.)\nCompleteness: A=10/10, B=3/10\nNet: one slow round trip vs. five in a row.",
          "header": "R6 parallel",
          "multiSelect": false,
          "options": [
            {
              "label": "Promise.all over the 5 calls (recommended)",
              "description": "\u2705 Cache-miss latency drops from the sum of five calls to the slowest one\n\u2705 Any single failure fails validation, which is the correct semantics for auth; maps to idp_unreachable\n\u274c Five concurrent connections per miss instead of one at a time; stampede mitigation is a separate TODO"
            },
            {
              "label": "Keep the calls sequential",
              "description": "\u2705 No change; lowest concurrent load on the IDP\n\u2705 Early exit on first failure without extra cancellation logic\n\u274c Every cold-cache login waits ~5x longer than it needs to"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D13 \u2014 Parallelize the 5 IDP calls with Promise.all?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P1 (PLAN.md:31-32), ledger row R6. Timeout and cancellation are a separate row (R8) and stay pending here.\nELI10: On every cache miss, token validation asks the identity provider five questions one after another. The plan says the five are independent, so they can be asked at the same time and the wait drops from the sum of five round trips to the slowest single one. Because auth needs all five answers, `Promise.all` (fail if any fails) is the right aggregator, not `allSettled`; a failure maps to the `idp_unreachable` outcome approved in D10.\nStakes if we pick wrong: leaving it sequential means every first login per tenant per policy version pays ~5x latency; parallelizing without verifying independence would be the real risk, but the plan states they are independent (verify during implementation).\nRecommendation: A because the plan itself calls it trivial, the calls are stated independent, and the win is a straight ~5x on cold-cache logins. (A: human ~2h / CC ~10 min.)\nCompleteness: A=10/10, B=3/10\nNet: one slow round trip vs. five in a row.": "Promise.all over the 5 calls (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:18:34.466Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_012iG5yMEuRiKHkVxCBYhLCp",
      "questions": [
        {
          "question": "D14 \u2014 Put a deadline on IDP validation, and cancel the sibling calls when one fails?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P2 / Architecture A4, ledger row R8 (R6 Promise.all approved in D13 and held fixed).\nELI10: Nothing in the plan says how long a login may wait on the identity provider. With five parallel calls, when one fails `Promise.all` reports failure right away, but the other four keep running and holding connections. During an IDP brownout that turns into piles of open sockets and logins that hang until the OS gives up. The fix is one shared `AbortController` per validation: a deadline (3 seconds, configurable) and an abort of the remaining calls as soon as one fails or the deadline hits. The result maps to the `idp_unreachable` outcome from D10.\nStakes if we pick wrong: an IDP slowdown becomes a login outage for every tenant, with connection exhaustion spreading to unrelated requests on the same process.\nRecommendation: A because it is stdlib (`AbortController` + `AbortSignal.timeout`) [Layer 1], a few lines, and the only option that bounds both wall time and resource use. 3 s is a starting default; tune it to the IDP's p99. (A: human ~3h / CC ~10 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=6/10, C=1/10\nNet: bounded wait and bounded sockets vs. bounded wait only vs. hope the IDP is fast.",
          "header": "R8 timeout",
          "multiSelect": false,
          "options": [
            {
              "label": "Deadline 3 s + abort siblings on first failure (recommended)",
              "description": "\u2705 Login never waits longer than the deadline; user gets idp_unreachable instead of a spinner\n\u2705 Failed validations release their four sibling connections immediately, so brownouts do not pile up sockets\n\u274c One more env var (AUTH_IDP_TIMEOUT_MS) to document; the IDP client must accept an AbortSignal"
            },
            {
              "label": "Deadline only, no sibling cancellation",
              "description": "\u2705 Bounds user-visible wait with less plumbing\n\u2705 No dependency on the IDP client honoring AbortSignal\n\u274c Sibling calls keep running to completion after a failure; socket pile-up under brownout remains"
            },
            {
              "label": "No timeout (as planned)",
              "description": "\u2705 Zero work\n\u2705 Relies on the HTTP client's default socket timeout, if any\n\u274c Login hang duration is undefined; IDP slowness becomes a full auth outage"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D14 \u2014 Put a deadline on IDP validation, and cancel the sibling calls when one fails?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P2 / Architecture A4, ledger row R8 (R6 Promise.all approved in D13 and held fixed).\nELI10: Nothing in the plan says how long a login may wait on the identity provider. With five parallel calls, when one fails `Promise.all` reports failure right away, but the other four keep running and holding connections. During an IDP brownout that turns into piles of open sockets and logins that hang until the OS gives up. The fix is one shared `AbortController` per validation: a deadline (3 seconds, configurable) and an abort of the remaining calls as soon as one fails or the deadline hits. The result maps to the `idp_unreachable` outcome from D10.\nStakes if we pick wrong: an IDP slowdown becomes a login outage for every tenant, with connection exhaustion spreading to unrelated requests on the same process.\nRecommendation: A because it is stdlib (`AbortController` + `AbortSignal.timeout`) [Layer 1], a few lines, and the only option that bounds both wall time and resource use. 3 s is a starting default; tune it to the IDP's p99. (A: human ~3h / CC ~10 min. B: human ~1h / CC ~5 min.)\nCompleteness: A=10/10, B=6/10, C=1/10\nNet: bounded wait and bounded sockets vs. bounded wait only vs. hope the IDP is fast.": "Deadline 3 s + abort siblings on first failure (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:19:06.157Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_011TogkGUwNTjNZBV6zJPuNp",
      "questions": [
        {
          "question": "D15 \u2014 TODO 1 of 4: capture the deferred legacyAuthFlow() rewrite in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; follows D4 (rewrite deferred behind the strangler flag).\nELI10: D4 kept legacyAuthFlow() live and routed new-path tenants to AuthBroker. The rewrite is now unowned work. A TODO records what it is, why it waits, and where to start so it is not forgotten once the flag is on for everyone.\nWhat: Rewrite or delete legacyAuthFlow() once all tenants run on AuthBroker; remove router + AUTH_V2_* flags.\nWhy: Two auth paths are a temporary state; leaving them forever doubles maintenance and test surface.\nPros: closes the strangler; one auth implementation; deletes flag plumbing.\nCons: needs every tenant migrated first; deleting the legacy path is a one-way door.\nContext: Parity suite (D11) is the acceptance test: when it is green for AuthBroker and AUTH_V2_TENANTS covers every tenant for one full token lifetime, the legacy path is dead code. Start at auth/router.ts.\nDepends on: this PR shipped; all tenants allowlisted; parity suite green.\nEffort: M. Priority: P2.\nStakes if we pick wrong: forgotten dual-path code, or a rewrite attempted before the net exists.\nRecommendation: A because it is real follow-up work with a clear trigger and the plan mode blocks building it now anyway.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: written down with a trigger vs. remembered by whoever is around.",
          "header": "TODO legacy",
          "multiSelect": false,
          "options": [
            {
              "label": "Add to TODOS.md (recommended)",
              "description": "\u2705 The rewrite has an owner-ready entry with its trigger condition and starting file\n\u2705 /retro and /ship can see the strangler is unfinished\n\u274c TODOS.md is created after plan mode exits; nothing is written now"
            },
            {
              "label": "Skip \u2014 not valuable enough",
              "description": "\u2705 No file churn\n\u2705 Fine if the rewrite is already tracked in your issue tracker\n\u274c Dual auth paths have no recorded exit plan in the repo"
            },
            {
              "label": "Build it now in this PR",
              "description": "\u2705 One PR closes the whole migration\n\u2705 No temporary router code to delete later\n\u274c Reverses D4: removes the strangler safety net this review was built around"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D15 \u2014 TODO 1 of 4: capture the deferred legacyAuthFlow() rewrite in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; follows D4 (rewrite deferred behind the strangler flag).\nELI10: D4 kept legacyAuthFlow() live and routed new-path tenants to AuthBroker. The rewrite is now unowned work. A TODO records what it is, why it waits, and where to start so it is not forgotten once the flag is on for everyone.\nWhat: Rewrite or delete legacyAuthFlow() once all tenants run on AuthBroker; remove router + AUTH_V2_* flags.\nWhy: Two auth paths are a temporary state; leaving them forever doubles maintenance and test surface.\nPros: closes the strangler; one auth implementation; deletes flag plumbing.\nCons: needs every tenant migrated first; deleting the legacy path is a one-way door.\nContext: Parity suite (D11) is the acceptance test: when it is green for AuthBroker and AUTH_V2_TENANTS covers every tenant for one full token lifetime, the legacy path is dead code. Start at auth/router.ts.\nDepends on: this PR shipped; all tenants allowlisted; parity suite green.\nEffort: M. Priority: P2.\nStakes if we pick wrong: forgotten dual-path code, or a rewrite attempted before the net exists.\nRecommendation: A because it is real follow-up work with a clear trigger and the plan mode blocks building it now anyway.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: written down with a trigger vs. remembered by whoever is around.": "Add to TODOS.md (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:20:18.088Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01AwYQ3jE2HigUjvwbuwVBgz",
      "questions": [
        {
          "question": "D16 \u2014 TODO 2 of 4: capture the deferred RequestPolicy class in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; follows D5 (RequestPolicy deferred until its responsibility is written).\nELI10: D5 pulled RequestPolicy out of this PR because the plan never said what it does. If it was a real need (tenant-level request policy checks, rate rules, policy-version gating), someone has to write that contract down before it comes back. A TODO holds the slot.\nWhat: Write a one-paragraph contract for RequestPolicy (owner, inputs, callers, what it decides) and re-plan it, or drop the idea.\nWhy: An unspecified class in the auth path is either missing work or speculative structure; this resolves which.\nPros: keeps the idea from being silently lost; forces a contract before code.\nCons: may turn out to be nothing, in which case the TODO is noise.\nContext: Original plan listed it among new classes (PLAN.md:35) with no description. The only \"policy\" the plan mentions is the adapter's policy-version cache key. Start by asking what request-time decision is not already made by AuthBroker.validate().\nDepends on: none.\nEffort: S. Priority: P3.\nStakes if we pick wrong: low either way; a lost idea or a stale TODO.\nRecommendation: A because deferral without a note is how deferred work disappears; the entry is tiny.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a small placeholder vs. relying on memory.",
          "header": "TODO policy",
          "multiSelect": false,
          "options": [
            {
              "label": "Add to TODOS.md (recommended)",
              "description": "\u2705 The deferred idea keeps a slot with the question it must answer\n\u2705 Trivial to close as \"dropped\" if it turns out unnecessary\n\u274c Might be noise if RequestPolicy was never a real need"
            },
            {
              "label": "Skip \u2014 not valuable enough",
              "description": "\u2705 Nothing to maintain\n\u2705 If it matters it will resurface during implementation\n\u274c The original intent behind the class is lost with no record"
            },
            {
              "label": "Build it now in this PR",
              "description": "\u2705 Avoids a second planning pass\n\u2705 Lands alongside the services that would call it\n\u274c Reverses D5: ships a class with no written contract in the auth path"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D16 \u2014 TODO 2 of 4: capture the deferred RequestPolicy class in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; follows D5 (RequestPolicy deferred until its responsibility is written).\nELI10: D5 pulled RequestPolicy out of this PR because the plan never said what it does. If it was a real need (tenant-level request policy checks, rate rules, policy-version gating), someone has to write that contract down before it comes back. A TODO holds the slot.\nWhat: Write a one-paragraph contract for RequestPolicy (owner, inputs, callers, what it decides) and re-plan it, or drop the idea.\nWhy: An unspecified class in the auth path is either missing work or speculative structure; this resolves which.\nPros: keeps the idea from being silently lost; forces a contract before code.\nCons: may turn out to be nothing, in which case the TODO is noise.\nContext: Original plan listed it among new classes (PLAN.md:35) with no description. The only \"policy\" the plan mentions is the adapter's policy-version cache key. Start by asking what request-time decision is not already made by AuthBroker.validate().\nDepends on: none.\nEffort: S. Priority: P3.\nStakes if we pick wrong: low either way; a lost idea or a stale TODO.\nRecommendation: A because deferral without a note is how deferred work disappears; the entry is tiny.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a small placeholder vs. relying on memory.": "Add to TODOS.md (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:20:32.180Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_0179nfiMtSm5rk5yUf8iooLJ",
      "questions": [
        {
          "question": "D17 \u2014 TODO 3 of 4: capture the pre-existing hook-vs-in-flight-write race in the cache adapter?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; surfaced as a factual correction under D8.\nELI10: D8 made AuthBroker the only service that writes to the cache, which kills the race between the two new services. A second, older race remains inside the unchanged adapter: an invalidation hook (logout, revocation, suspension) can fire between a validation finishing and its cache write landing, so the freshly-invalidated entry gets written back and lives until expiry. This exists today with the current code and is out of this PR's scope (the adapter is retained unchanged per PLAN.md:12-13).\nWhat: Make cache writes invalidation-aware in the adapter or facade (e.g. per-tenant invalidation generation checked on set, or re-check tenant/revocation state immediately before write).\nWhy: A suspended or revoked tenant can authenticate until token expiry if the timing lines up; the window is small but the impact is a security bypass.\nPros: closes the last resurrection path; the D11 parity suite gives a place to add the concurrency test.\nCons: touches the adapter this plan promised not to touch; needs a real concurrency test harness.\nContext: Race window = time between last IDP response and AuthCache.set(). Reproduce with a fake adapter that fires invalidate() during that window. Start in the AuthCache facade (D6/D7) since it fronts every write.\nDepends on: this PR shipped (AuthCache facade exists).\nEffort: M. Priority: P1.\nStakes if we pick wrong: an unrecorded security race in the auth path.\nRecommendation: A because it is a security-relevant gap with a concrete reproduction path, and building it now would break the \"adapter unchanged\" contract this review held fixed.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a recorded P1 with a repro vs. an unrecorded race.",
          "header": "TODO race",
          "multiSelect": false,
          "options": [
            {
              "label": "Add to TODOS.md (recommended)",
              "description": "\u2705 Security-relevant race gets a P1 entry with the repro recipe and the file to start in\n\u2705 Adapter contract for this PR stays intact\n\u274c The window stays open until the follow-up lands"
            },
            {
              "label": "Skip \u2014 not valuable enough",
              "description": "\u2705 No new tracked work\n\u2705 Window is small in practice\n\u274c Known security race with no record; next reader rediscovers it from scratch"
            },
            {
              "label": "Build it now in this PR",
              "description": "\u2705 Closes the window in the same change that adds the facade\n\u2705 Concurrency test lands with the parity suite\n\u274c Breaks the \"adapter, hooks, tests unchanged\" contract (PLAN.md:12-13) and widens a 12-file PR"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D17 \u2014 TODO 3 of 4: capture the pre-existing hook-vs-in-flight-write race in the cache adapter?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; surfaced as a factual correction under D8.\nELI10: D8 made AuthBroker the only service that writes to the cache, which kills the race between the two new services. A second, older race remains inside the unchanged adapter: an invalidation hook (logout, revocation, suspension) can fire between a validation finishing and its cache write landing, so the freshly-invalidated entry gets written back and lives until expiry. This exists today with the current code and is out of this PR's scope (the adapter is retained unchanged per PLAN.md:12-13).\nWhat: Make cache writes invalidation-aware in the adapter or facade (e.g. per-tenant invalidation generation checked on set, or re-check tenant/revocation state immediately before write).\nWhy: A suspended or revoked tenant can authenticate until token expiry if the timing lines up; the window is small but the impact is a security bypass.\nPros: closes the last resurrection path; the D11 parity suite gives a place to add the concurrency test.\nCons: touches the adapter this plan promised not to touch; needs a real concurrency test harness.\nContext: Race window = time between last IDP response and AuthCache.set(). Reproduce with a fake adapter that fires invalidate() during that window. Start in the AuthCache facade (D6/D7) since it fronts every write.\nDepends on: this PR shipped (AuthCache facade exists).\nEffort: M. Priority: P1.\nStakes if we pick wrong: an unrecorded security race in the auth path.\nRecommendation: A because it is a security-relevant gap with a concrete reproduction path, and building it now would break the \"adapter unchanged\" contract this review held fixed.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a recorded P1 with a repro vs. an unrecorded race.": "Add to TODOS.md (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:20:50.270Z"
    },
    {
      "sessionId": "a5bd9ed4-796f-4d5d-9bea-ab180502c903",
      "toolUseId": "toolu_01LGQfvFrJBdh9enxbdBknXS",
      "questions": [
        {
          "question": "D18 \u2014 TODO 4 of 4: capture cold-cache stampede protection (in-flight dedupe) for AuthBroker?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P3 (medium confidence 6/10).\nELI10: With D13, every cache miss fires five IDP calls at once. After a deploy, or when the kill switch flips back on, the cache is cold and every request for the same tenant/token misses at the same moment. N concurrent misses become 5N IDP calls for the same answer. A singleflight map (one in-flight validation promise per cache key; later callers await it) turns that into 5 calls total. This is an optimization beyond the plan and its need depends on IDP rate limits this review could not see.\nWhat: In AuthBroker.validate(), keep a Map<cacheKey, Promise<AuthResult>> of in-flight validations; concurrent misses for the same key await the first.\nWhy: Prevents a 5x call burst to the IDP on cold cache; protects against IDP rate-limit rejections turning into idp_unreachable for real users.\nPros: small, self-contained; no new dependency; measurable in the fake-IDP test (call count).\nCons: speculative until IDP rate limits are known; adds a Map to reason about (must delete entry on settle).\nContext: Only matters if IDP concurrency limits are tighter than peak login rate x 5. Check the IDP's documented limits first; if generous, close this as not needed.\nDepends on: D13 shipped; IDP rate-limit numbers.\nEffort: S. Priority: P3.\nStakes if we pick wrong: either a stampede at the first cold start or a few lines nobody needed.\nRecommendation: A because the check (read the IDP limits) is cheap and the fix is small; recording it beats rediscovering it during an incident.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a P3 with a go/no-go check vs. finding out at the first cold start.",
          "header": "TODO dedupe",
          "multiSelect": false,
          "options": [
            {
              "label": "Add to TODOS.md (recommended)",
              "description": "\u2705 Stampede risk is recorded with the one fact needed to decide it (IDP rate limits)\n\u2705 Fix is a few lines when and if it is needed\n\u274c May be closed as unnecessary; minor TODO noise"
            },
            {
              "label": "Skip \u2014 not valuable enough",
              "description": "\u2705 Nothing speculative in the backlog\n\u2705 IDP may well tolerate the burst\n\u274c First cold start after enabling v2 is the moment you find out"
            },
            {
              "label": "Build it now in this PR",
              "description": "\u2705 Ships with the parallelization it protects against\n\u2705 Fake-IDP test can assert call count under concurrent misses\n\u274c Adds concurrency state to AuthBroker before knowing it is needed; widens the PR"
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D18 \u2014 TODO 4 of 4: capture cold-cache stampede protection (in-flight dedupe) for AuthBroker?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance finding P3 (medium confidence 6/10).\nELI10: With D13, every cache miss fires five IDP calls at once. After a deploy, or when the kill switch flips back on, the cache is cold and every request for the same tenant/token misses at the same moment. N concurrent misses become 5N IDP calls for the same answer. A singleflight map (one in-flight validation promise per cache key; later callers await it) turns that into 5 calls total. This is an optimization beyond the plan and its need depends on IDP rate limits this review could not see.\nWhat: In AuthBroker.validate(), keep a Map<cacheKey, Promise<AuthResult>> of in-flight validations; concurrent misses for the same key await the first.\nWhy: Prevents a 5x call burst to the IDP on cold cache; protects against IDP rate-limit rejections turning into idp_unreachable for real users.\nPros: small, self-contained; no new dependency; measurable in the fake-IDP test (call count).\nCons: speculative until IDP rate limits are known; adds a Map to reason about (must delete entry on settle).\nContext: Only matters if IDP concurrency limits are tighter than peak login rate x 5. Check the IDP's documented limits first; if generous, close this as not needed.\nDepends on: D13 shipped; IDP rate-limit numbers.\nEffort: S. Priority: P3.\nStakes if we pick wrong: either a stampede at the first cold start or a few lines nobody needed.\nRecommendation: A because the check (read the IDP limits) is cheap and the fix is small; recording it beats rediscovering it during an incident.\nNote: options differ in kind, not coverage \u2014 no completeness score.\nNet: a P3 with a go/no-go check vs. finding out at the first cold start.": "Add to TODOS.md (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:21:08.391Z"
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      "questions": [
        {
          "question": "D15 — Next step after this eng review?\nProject/branch/task: gstack-plan-count-1OoDxf on main, Multi-tenant Auth Refactor plan.\nELI10: The engineering review is done and every P1 fix is approved and specified; one performance follow-up (R6) is intentionally parked until the 5 IDP calls are enumerated. The remaining choice is whether another review pass adds value before coding starts. There is no UI, so design review does not apply.\nStakes if we pick wrong: an unnecessary review costs a session; skipping a needed one risks scope creeping back (TokenStore/RequestPolicy) during implementation.\nRecommendation: C because all blocking decisions are made and scope was already challenged in Step 0; the open item (R6) is a follow-up task (T6), not a blocker.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start T1-T5 now versus one more strategic pass over a scope that was already reduced.",
          "header": "Next Steps",
          "multiSelect": false,
          "options": [
            {
              "label": "C) Ready to implement (recommended)",
              "description": "✅ All P1 remedies approved with proof tests; 10 tasks and 4 parallel lanes are laid out. ✅ REGRESSION RULE satisfied by T1 gate before any rewrite. ❌ R6 stays open and must be re-asked after T6, or every cache miss keeps making 5 IDP calls."
            },
            {
              "label": "B) CEO review (/plan-ceo-review)",
              "description": "✅ Independent challenge of whether the refactor itself is worth 9-10 files this cycle. ✅ Would formalize TokenStore/RequestPolicy deferral at the strategy level. ❌ Scope was already cut 5→3 classes in Step 0; likely re-confirms D4-D6 at the cost of a session."
            },
            {
              "label": "A) Design review (/plan-design-review)",
              "description": "✅ Would catch UX gaps if any surface existed. ❌ This plan has no UI or user-facing screens; the review would have nothing to evaluate."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D15 — Next step after this eng review?\nProject/branch/task: gstack-plan-count-1OoDxf on main, Multi-tenant Auth Refactor plan.\nELI10: The engineering review is done and every P1 fix is approved and specified; one performance follow-up (R6) is intentionally parked until the 5 IDP calls are enumerated. The remaining choice is whether another review pass adds value before coding starts. There is no UI, so design review does not apply.\nStakes if we pick wrong: an unnecessary review costs a session; skipping a needed one risks scope creeping back (TokenStore/RequestPolicy) during implementation.\nRecommendation: C because all blocking decisions are made and scope was already challenged in Step 0; the open item (R6) is a follow-up task (T6), not a blocker.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start T1-T5 now versus one more strategic pass over a scope that was already reduced.": "C) Ready to implement (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-15T19:51:51.347Z"
    },
    "priorCalls": [
      {
        "sessionId": "604c616f-edb2-4d04-bf37-deef45a62a4b",
        "toolUseId": "toolu_01DtxXQEpE3DjjXwuUbFcLUz",
        "questions": [
          {
            "question": "D12 — R6: Cache per-issuer IDP metadata (discovery doc, JWKS, tenant config) so most validations skip the network entirely?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance review, R5 approved (parallel calls with idpCall wrapper).\nELI10: Parallelizing (R5) turns 5 round trips into 1 round trip of latency, but every cache miss still makes 5 network calls. If some of those 5 fetch things that rarely change for a given IDP issuer (its discovery document, its signing keys, a tenant's config), those responses can be cached per issuer with a TTL and most validations would make 0 or 1 calls. I do not know what the 5 calls are; the plan does not list them. R5 already includes a task to enumerate them. Deciding on caching before that list exists would be guessing.\nStakes if we pick wrong: build a metadata cache for calls that turn out to be all per-token (introspection, userinfo) and it is dead code; skip it when 3 of the 5 are static metadata and you leave a 60-80% network reduction on the table plus an IDP hammering risk at scale.\nRecommendation: C because the R5 enumeration produces exactly the information this decision needs, at no extra cost; choose with facts, not guesses. This is an outside-style policy row: keep other approved choices fixed.\nNote: options differ in kind, not coverage — no completeness score.\nNet: decide now blind vs decide right after a task you are already doing.",
            "header": "R6 metadata",
            "multiSelect": false,
            "options": [
              {
                "label": "C) Investigate before choosing (recommended)",
                "description": "✅ The R5 call enumeration (already accepted) tells you which calls are static metadata; this row is re-asked with that list in hand (human: ~1h / CC: ~5 min)\n✅ No dead code and no missed win; the decision waits exactly as long as it needs to\n❌ Leaves one pending row in the ledger; the plan reports it as an unresolved decision until the enumeration is done"
              },
              {
                "label": "A) Apply: add per-issuer metadata cache now",
                "description": "✅ If the calls include discovery/JWKS/tenant config, cache misses drop to 0-1 network calls and IDP load falls sharply\n✅ JWKS refresh-on-unknown-kid is a well-known Layer 1 pattern with little risk\n❌ Built before knowing if any of the 5 calls qualify; could be dead code (human: ~1 day / CC: ~30 min)"
              },
              {
                "label": "B) Keep current value: no metadata cache",
                "description": "✅ Nothing to build; R5 already delivers the latency win\n✅ No second cache with its own TTL semantics next to the token cache\n❌ Every cache miss still makes all 5 network calls; at scale the IDP sees the full validation volume"
              },
              {
                "label": "D) Defer this proposed change only",
                "description": "✅ Removes it from this PR cleanly; can be a TODO with the R5 call list attached\n✅ Keeps the PR focused on correctness fixes\n❌ Same downside as B for this release, and the decision still has to be made later without the review context"
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D12 — R6: Cache per-issuer IDP metadata (discovery doc, JWKS, tenant config) so most validations skip the network entirely?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; Performance review, R5 approved (parallel calls with idpCall wrapper).\nELI10: Parallelizing (R5) turns 5 round trips into 1 round trip of latency, but every cache miss still makes 5 network calls. If some of those 5 fetch things that rarely change for a given IDP issuer (its discovery document, its signing keys, a tenant's config), those responses can be cached per issuer with a TTL and most validations would make 0 or 1 calls. I do not know what the 5 calls are; the plan does not list them. R5 already includes a task to enumerate them. Deciding on caching before that list exists would be guessing.\nStakes if we pick wrong: build a metadata cache for calls that turn out to be all per-token (introspection, userinfo) and it is dead code; skip it when 3 of the 5 are static metadata and you leave a 60-80% network reduction on the table plus an IDP hammering risk at scale.\nRecommendation: C because the R5 enumeration produces exactly the information this decision needs, at no extra cost; choose with facts, not guesses. This is an outside-style policy row: keep other approved choices fixed.\nNote: options differ in kind, not coverage — no completeness score.\nNet: decide now blind vs decide right after a task you are already doing.": "C) Investigate before choosing (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-15T19:44:36.055Z"
      },
      {
        "sessionId": "604c616f-edb2-4d04-bf37-deef45a62a4b",
        "toolUseId": "toolu_01EgFqZBhycDhGCpHu66GYQM",
        "questions": [
          {
            "question": "D14 — TODO: capture the deferred RequestPolicy in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; TODOS.md updates.\nELI10: RequestPolicy was deferred in D5 for the same reason as TokenStore: no stated contract, and a name that overlaps the adapter's existing policy-version cache key. The proposed TODO: **What:** Define what RequestPolicy enforces and how it relates to the cache's policy version. **Why:** two notions of \"policy\" that can drift is a correctness bug (a policy bump invalidates cache entries but the enforcer keeps the old rule, or vice versa). **Pros:** forces the policy-version relationship to be written before any second policy class exists. **Cons:** may resolve to \"policy version already covers it\". **Context:** the adapter keys entries by tenant/issuer/audience/policy version (PLAN.md:7-8); R3 added a `PolicyMismatch` AuthError variant for cache-key-vs-current mismatch. Start from that variant: if RequestPolicy would only re-derive it, cut it. **Depends on:** R3 landing (PolicyMismatch variant). **Effort:** S. **Priority:** P3.\nStakes if we pick wrong: skip and the policy-drift question is never asked; build now and you ship a second policy concept without defining its relationship to the first.\nRecommendation: A because the policy-version relationship is exactly the kind of reasoning that gets lost without a written TODO.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a backlog entry that carries the drift risk explicitly vs dropping it vs reversing D5.",
            "header": "TODO Policy",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Add to TODOS.md (recommended)",
                "description": "✅ The policy-version drift concern is written down where the next implementer will see it\n✅ Written on plan exit under `## Auth` with Effort S / Priority P3\n❌ Backlog item that may resolve to \"already covered by PolicyMismatch\""
              },
              {
                "label": "B) Skip, not valuable enough",
                "description": "✅ No backlog entry for an undefined class\n✅ Nothing to maintain\n❌ The drift question between RequestPolicy and policy version is never asked on record"
              },
              {
                "label": "C) Build it now in this PR",
                "description": "✅ Gives per-tenant request rules a named home immediately if you can define them now\n✅ No deferral to track\n❌ Reverses D5 and adds a second policy concept with no written relationship to the cache key"
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D14 — TODO: capture the deferred RequestPolicy in TODOS.md?\nProject/branch/task: `main`, PLAN.md Multi-tenant Auth Refactor; TODOS.md updates.\nELI10: RequestPolicy was deferred in D5 for the same reason as TokenStore: no stated contract, and a name that overlaps the adapter's existing policy-version cache key. The proposed TODO: **What:** Define what RequestPolicy enforces and how it relates to the cache's policy version. **Why:** two notions of \"policy\" that can drift is a correctness bug (a policy bump invalidates cache entries but the enforcer keeps the old rule, or vice versa). **Pros:** forces the policy-version relationship to be written before any second policy class exists. **Cons:** may resolve to \"policy version already covers it\". **Context:** the adapter keys entries by tenant/issuer/audience/policy version (PLAN.md:7-8); R3 added a `PolicyMismatch` AuthError variant for cache-key-vs-current mismatch. Start from that variant: if RequestPolicy would only re-derive it, cut it. **Depends on:** R3 landing (PolicyMismatch variant). **Effort:** S. **Priority:** P3.\nStakes if we pick wrong: skip and the policy-drift question is never asked; build now and you ship a second policy concept without defining its relationship to the first.\nRecommendation: A because the policy-version relationship is exactly the kind of reasoning that gets lost without a written TODO.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a backlog entry that carries the drift risk explicitly vs dropping it vs reversing D5.": "A) Add to TODOS.md (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-15T19:45:52.214Z"
      }
    ],
    "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\nReviewed target: `PLAN.md` on `main` (commit 360b3cb) via `/plan-eng-review`, 2026-09-15.\nReport file: this file (user-requested path). Scope: reduced per recommendation (D4-D6). Mode: SCOPE_REDUCED.\n\n## Decision ledger\n\n### R6: Per-issuer IDP metadata caching\nFinding: Performance #3, P2, confidence 5/10, PLAN.md:31, native reviewer\nPlan baseline: no metadata cache\nRuntime evidence: unknown which calls fetch cacheable metadata\nState: pending (Investigate)\n\nComparison grid:\n\n| Choice | Current | A | B | C | D |\n|---|---|---|---|---|---|\n| R6 metadata cache | none | per-issuer cache, TTL from Cache-Control / 5 min, JWKS refresh-on-unknown-kid | none | investigate after R5 enumeration | defer |\n| R5 wrapper | approved (D11) | unchanged | unchanged | unchanged | unchanged |\n| Token cache | approved | unchanged, separate | unchanged | unchanged | unchanged |\n\nQuestion D12: \"Cache per-issuer IDP metadata (discovery doc, JWKS, tenant config) so most validations skip the network entirely?\" Options: C) Investigate before choosing (recommended); A) Apply now; B) Keep current value; D) Defer this change only. Note: options differ in kind.\n\nActual answer: C) Investigate before choosing (D12)\nAccepted scope: bounded investigation only: mark each of the 5 calls per-token vs per-issuer-static in the plan's \"The 5 IDP calls\" table. No cache implementation approved. R6 remains unresolved until re-asked with the list.\nHistory: none\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific finding above. Run with Claude Code or Codex; checkbox as you ship. Ratios assumed: tests ~50x, features ~30x, architecture ~5x.\n\n- [ ] **T1 (P1, human: ~1 day / CC: ~30 min)** — tests/auth — Record `legacyAuthFlow()` characterization suite (10 cases) and commit green against legacy before any rewrite\n  - Surfaced by: Test review — R4 / D10, PLAN.md:27-28\n  - Files: `legacyAuthFlow.characterization.test.*`, plan section \"Intended differences\"\n  - Verify: suite green on unmodified legacy; later green on the new flow\n- [ ] **T2 (P1, human: ~1 day / CC: ~30 min)** — auth/cache — Implement `AuthCache` with per-key invalidation generation and conditional `put`; minimal surface; eviction hook removes generation; inline diagram\n  - Surfaced by: Architecture — R2 / D8, PLAN.md:10, :20; Code Quality #3\n  - Files: `AuthCache.*`, `AuthCache.test.*`\n  - Verify: put-after-invalidate dropped; tenant-wide suspension; cross-tenant isolation; race integration test\n- [ ] **T3 (P1, human: ~2h / CC: ~10 min)** — app bootstrap, auth/broker, auth/mint — Remove module-level export; inject one `AuthCache` from the composition root\n  - Surfaced by: Architecture — R1 / D7, PLAN.md:19-20\n  - Files: composition root, `AuthBroker` and `SessionMint` constructors\n  - Verify: shared-instance and separate-instance tests\n- [ ] **T4 (P1, human: ~half day / CC: ~20 min)** — auth/broker — Split `validateAndDispatch()` into `validate`/`dispatch`; typed `AuthError` union; fail closed\n  - Surfaced by: Code Quality — R3 / D9, PLAN.md:23-24\n  - Files: broker module, request boundary handler, `AuthError.*`\n  - Verify: one test per variant; unknown rethrown; dispatch unreachable on failure\n- [ ] **T5 (P2, human: ~half day / CC: ~20 min)** — auth/idp-client — Add `idpCall` wrapper (timeout, abort, name); `Promise.all` with one AbortController; keep-alive agent\n  - Surfaced by: Performance — R5 / D11, PLAN.md:31-32; Code Quality #2 (DRY)\n  - Files: IDP client module, `AuthBroker.validate()`\n  - Verify: timeout -> IdpUnavailable with failedCall; abort on first rejection; latency ~= max\n- [ ] **T6 (P2, human: ~1h / CC: ~5 min)** — plan — Enumerate the 5 IDP calls (name, input, output, depends-on, per-token vs per-issuer-static); sequence any dependent pair; feeds R6\n  - Surfaced by: Performance #2 and R6 / D12\n  - Files: this plan, \"The 5 IDP calls\" table\n  - Verify: table complete; R6 re-asked\n- [ ] **T7 (P1, human: ~1 day / CC: ~30 min)** — auth/mint — Implement `SessionMint.mint()` using `beginWrite`/`put`; return token even when write dropped; inline diagram\n  - Surfaced by: Architecture — R2 / D8; Test review GAPs\n  - Files: `SessionMint.*`, `SessionMint.test.*`\n  - Verify: success cached; invalidated-during dropped; IDP failure typed\n- [ ] **T8 (P1, human: ~1 day / CC: ~30 min)** — tests/e2e — Three E2E flows: two-tenant happy path; revoke mid-session -> 401; suspend tenant -> tenant-wide 401, others unaffected\n  - Surfaced by: Test review — [→E2E] gaps, retained contract PLAN.md:8-10\n  - Files: e2e suite\n  - Verify: all three pass against the composed app\n- [ ] **T9 (P2, human: ~half day / CC: ~15 min)** — auth/legacy — Rewrite `legacyAuthFlow()` on top of AuthBroker/SessionMint; fill \"Intended differences\"; remove stale comments\n  - Surfaced by: Tests — PLAN.md:27; Code Quality #4\n  - Files: legacy flow module\n  - Verify: T1 suite green with only listed differences\n- [ ] **T10 (P3, human: ~15 min / CC: ~2 min)** — repo — Create `TODOS.md` with the two accepted TODOs (D13, D14) under `## Auth`\n  - Surfaced by: TODOS.md updates\n  - Files: `TODOS.md`\n  - Verify: file present with both items\n\n_No new tasks from Outside Voice (disabled)._\n\n## Worktree parallelization strategy\n\n| Step | Modules touched | Depends on |\n|------|----------------|------------|\n| S1 legacyAuthFlow characterization suite | tests/auth (legacy) | — |\n| S2 AuthCache facade + generation | auth/cache | — |\n| S3 idpCall wrapper + 5-call enumeration | auth/idp-client | — |\n| S4 validate/dispatch split + AuthError + AuthBroker | auth/broker | S2, S3 |\n| S5 SessionMint | auth/mint | S2 |\n| S6 composition root wiring | app bootstrap | S2, S4, S5 |\n| S7 legacyAuthFlow rewrite + E2E flows | auth/legacy, tests/e2e | S1, S4, S5, S6 |\n\nLanes: `Lane A: S1 (independent)` / `Lane B: S2 → S5 (sequential, S5 needs AuthCache API)` / `Lane C: S3 → S4 (sequential, S4 needs idpCall; S4 also waits on S2)` / `Lane D: S6 → S7 (after A, B, C merge)`.\nExecution order: launch A, B, C in parallel worktrees. Merge B before S4 starts in C (S4 needs AuthCache). Merge all, then D.\nConflict flags: S4 and S5 both live under `auth/` and both consume the AuthCache API; if they share a directory, coordinate the import surface or run S5 after S4. S7 touches the file S1 tested; S1 must be merged and green first (REGRESSION RULE).\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | — | — |\n| Outside Review | codex via `/plan-eng-review` outside voice | Independent 2nd opinion | 1 | DISABLED (skipped) | codex_reviews disabled; no findings |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | ISSUES OPEN | 40 issues, 0 critical gaps |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | — | — |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | — | — |\n\n**OUTSIDE COVERAGE:** provider codex, phase plan-review, disabled (opt-out via `codex_reviews`), no findings; no native fallback dispatched.\n\n**VERDICT:** No reviews CLEAR. Eng Review ISSUES OPEN (1 unresolved decision, 0 critical gaps) — eng review required. All P1 remedies are approved and specified; the open item is a performance follow-up, not a blocker to starting T1-T5.\n\n**UNRESOLVED DECISIONS:**\n- R6 / D12 — per-issuer IDP metadata cache: Investigate; re-ask after the 5 IDP calls are enumerated (T6)\n",
    "captureAt": "2026-09-15T19:58:22.814Z",
    "reportMtimeMs": 1789501736036.9578,
    "startedAt": 1789500807800.0,
    "planReadyRequests": [
      {
        "sessionId": "604c616f-edb2-4d04-bf37-deef45a62a4b",
        "toolUseId": "toolu_01QjYheYXsvycjoZzikwMrcp",
        "timestamp": "2026-09-15T19:53:05.518Z",
        "failed": false,
        "source": "pre_tool_use"
      }
    ],
    "projection": "Exact parent D12 and D14 ACKs, D15 question/ACK, and current owned report sections; full 15-call report replay retained separately."
  },
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    "first": {
      "source": "cf74db538a2f4c4361f2573316abb91e01663564",
      "transcript": {
        "status": "ready",
        "calls": [
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01A4pycvvxmzmaYnpaFkNaRL",
            "questions": [
              {
                "question": "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo; one-time gstack setup prompt before the engineering review.\nELI10: gstack skills work best when the project's CLAUDE.md tells Claude which skill to reach for (\"bugs → /investigate\", \"architecture → /plan-eng-review\"). Without it you invoke skills by hand every time. This is a setup question only; it does not approve anything about the auth refactor plan.\nStakes if we pick wrong: Nothing breaks either way; you just lose automatic skill routing (A) or get a CLAUDE.md edit you did not want (B).\nRecommendation: A because routing rules are a small, reversible CLAUDE.md append that makes future sessions pick the right skill without prompting.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a tiny committed doc edit versus manual skill invocation forever. (Plan mode is active, so the actual CLAUDE.md append and commit would happen after the review exits plan mode.)",
                "header": "Routing",
                "multiSelect": false,
                "options": [
                  {
                    "label": "Add routing rules to CLAUDE.md (recommended)",
                    "description": "✅ Future sessions auto-route requests to the right gstack skill without you naming it. ✅ One small appended section, committed as its own chore commit, trivially revertable. ❌ Adds ~20 lines to CLAUDE.md that every session loads into context."
                  },
                  {
                    "label": "No thanks, I'll invoke skills manually",
                    "description": "✅ CLAUDE.md stays exactly as the fixture authored it, nothing extra in context. ✅ You keep full control over when a skill runs. ❌ Every skill has to be typed by hand; the prompt is suppressed per project and only re-enabled via gstack-config."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo; one-time gstack setup prompt before the engineering review.\nELI10: gstack skills work best when the project's CLAUDE.md tells Claude which skill to reach for (\"bugs → /investigate\", \"architecture → /plan-eng-review\"). Without it you invoke skills by hand every time. This is a setup question only; it does not approve anything about the auth refactor plan.\nStakes if we pick wrong: Nothing breaks either way; you just lose automatic skill routing (A) or get a CLAUDE.md edit you did not want (B).\nRecommendation: A because routing rules are a small, reversible CLAUDE.md append that makes future sessions pick the right skill without prompting.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a tiny committed doc edit versus manual skill invocation forever. (Plan mode is active, so the actual CLAUDE.md append and commit would happen after the review exits plan mode.)": "Add routing rules to CLAUDE.md (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:02:21.037Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01FgjSvJb2sMP5R2wb4hkqt2",
            "questions": [
              {
                "question": "D2 — Run /office-hours first, or go straight into the engineering review?\nProject/branch/task: main branch; reviewing PLAN.md \"Multi-tenant Auth Refactor\". No design doc found for this branch.\nELI10: A design doc is a short write-up of the problem being solved, the constraints, and the alternatives that were considered and rejected. /office-hours produces one in about 10 minutes (human: ~10 min / CC: ~3 min). Right now the plan tells me WHAT will be built (four new classes, a shared cache, a rewritten legacy flow) but not WHY, so some of my review will have to guess at intent. The design doc is per-feature: it captures the thinking behind this specific auth change, not the whole product.\nStakes if we pick wrong: Skip it and the review may argue with premises you already settled; run it and you spend 10 minutes before seeing any findings.\nRecommendation: B because the plan already carries five concrete, reviewable engineering claims and the CLAUDE.md request is for a thorough review of this plan as written; a design doc would sharpen intent but is not blocking.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper problem framing up front versus getting to the architecture findings now.",
                "header": "Design doc",
                "multiSelect": false,
                "options": [
                  {
                    "label": "Skip — proceed with standard review (recommended)",
                    "description": "✅ Findings on the shared mutable AuthCache, the missing legacyAuthFlow regression test, and the sequential IDP calls arrive immediately. ✅ Honors the stated request: review this plan thoroughly as written. ❌ Review has to infer the problem statement and rejected alternatives from a very terse plan."
                  },
                  {
                    "label": "Run /office-hours now",
                    "description": "✅ Produces a problem statement, premise challenge, and explored alternatives that ground every later recommendation. ✅ Catches a wrong premise (e.g. whether four new classes are needed at all) before we debate their shape. ❌ Roughly 10 minutes of Q&A before the engineering findings start."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D2 — Run /office-hours first, or go straight into the engineering review?\nProject/branch/task: main branch; reviewing PLAN.md \"Multi-tenant Auth Refactor\". No design doc found for this branch.\nELI10: A design doc is a short write-up of the problem being solved, the constraints, and the alternatives that were considered and rejected. /office-hours produces one in about 10 minutes (human: ~10 min / CC: ~3 min). Right now the plan tells me WHAT will be built (four new classes, a shared cache, a rewritten legacy flow) but not WHY, so some of my review will have to guess at intent. The design doc is per-feature: it captures the thinking behind this specific auth change, not the whole product.\nStakes if we pick wrong: Skip it and the review may argue with premises you already settled; run it and you spend 10 minutes before seeing any findings.\nRecommendation: B because the plan already carries five concrete, reviewable engineering claims and the CLAUDE.md request is for a thorough review of this plan as written; a design doc would sharpen intent but is not blocking.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper problem framing up front versus getting to the architecture findings now.": "Skip — proceed with standard review (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:03:15.137Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01NW9yNB4ARbEUB6GpgpJJjE",
            "questions": [
              {
                "question": "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch, reviewing PLAN.md \"Multi-tenant Auth Refactor\"; first-time learnings setup (cross_project_learnings is unset).\nELI10: gstack saves small lessons after each session (\"this repo's test runner needs X\", \"shared mutable singletons bit us before\"). By default it only looks at lessons from THIS project. Cross-project mode also searches lessons from your other repos on this machine, which helps a solo developer reuse patterns. Nothing leaves your machine either way. This is setup only; it does not approve any change to the auth plan.\nStakes if we pick wrong: Enable it on a machine with multiple client codebases and one client's patterns could color advice for another; keep it scoped and you lose reuse of your own past lessons.\nRecommendation: A because this is a local-only search and a solo/single-owner setup benefits from every past lesson; flip it off later with gstack-config if client isolation matters.\nNote: options differ in kind, not coverage — no completeness score.\nNet: broader recall of your own past lessons versus strict per-project isolation.",
                "header": "Learnings",
                "multiSelect": false,
                "options": [
                  {
                    "label": "Enable cross-project learnings (recommended)",
                    "description": "✅ Reviews get smarter across every repo you work on, not just this one. ✅ Stays local; no learning data leaves this machine. ❌ Patterns from one codebase can surface in another where they do not apply."
                  },
                  {
                    "label": "Keep learnings project-scoped only",
                    "description": "✅ Strict isolation between codebases, right for multi-client work. ✅ Zero chance of a lesson from repo A being misapplied to repo B. ❌ Every new project starts cold; lessons you already learned elsewhere are invisible here."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch, reviewing PLAN.md \"Multi-tenant Auth Refactor\"; first-time learnings setup (cross_project_learnings is unset).\nELI10: gstack saves small lessons after each session (\"this repo's test runner needs X\", \"shared mutable singletons bit us before\"). By default it only looks at lessons from THIS project. Cross-project mode also searches lessons from your other repos on this machine, which helps a solo developer reuse patterns. Nothing leaves your machine either way. This is setup only; it does not approve any change to the auth plan.\nStakes if we pick wrong: Enable it on a machine with multiple client codebases and one client's patterns could color advice for another; keep it scoped and you lose reuse of your own past lessons.\nRecommendation: A because this is a local-only search and a solo/single-owner setup benefits from every past lesson; flip it off later with gstack-config if client isolation matters.\nNote: options differ in kind, not coverage — no completeness score.\nNet: broader recall of your own past lessons versus strict per-project isolation.": "Enable cross-project learnings (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:04:11.282Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_014cJBaCUKZYs28BVYs7Aahc",
            "questions": [
              {
                "question": "D4 — Keep the legacyAuthFlow() rewrite inside this change, or defer it to a follow-up?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", complexity gate, scope item S4 (PLAN.md:27-28).\nELI10: legacyAuthFlow() is the code that logs users in today. The plan rewrites it in the same change that adds five new auth classes across 12 files. If anything in the rewrite differs from today's behavior, every existing user feels it at the same moment the new tenant code lands, and there is no single thing to roll back. A strangler approach adds the new services first, leaves the legacy function serving existing callers untouched, and migrates callers in a second, smaller change. This question decides scope only; how the legacy behavior gets test-protected is a separate Test review decision either way.\nStakes if we pick wrong: Keep it and a login regression is tangled with a 12-file refactor at rollback time; defer it and you carry two auth paths for one extra PR.\nRecommendation: B because auth is the highest-blast-radius code you own and incremental change (new path first, migrate second) makes a bad rewrite cheap to undo. (human: ~1 day saved now / CC: ~20 min either way)\nNote: options differ in kind, not coverage — no completeness score.\nNet: one bigger change with one rollback lever versus two smaller changes where legacy login is untouched until the new path is proven.",
                "header": "Legacy scope",
                "multiSelect": false,
                "options": [
                  {
                    "label": "Defer rewrite — strangler, legacy untouched (recommended)",
                    "description": "✅ Existing logins keep running the exact code they run today while AuthBroker/SessionMint land. ✅ Rollback of the new services never touches the legacy path; blast radius is new tenants only. ❌ Two auth paths coexist until the follow-up migration lands; that follow-up must actually get scheduled."
                  },
                  {
                    "label": "Keep rewrite in this change",
                    "description": "✅ One change, one code path, no interim dual-path maintenance. ✅ Matches the plan as written; no re-sequencing. ❌ A behavior drift in the rewrite ships bundled with 12 files of unrelated refactor, so rollback means reverting everything."
                  },
                  {
                    "label": "Cut the rewrite entirely",
                    "description": "✅ Smallest possible diff; legacyAuthFlow() stays as-is indefinitely. ✅ Zero regression exposure on existing logins from this work. ❌ Whatever motivated the rewrite (unknown from the plan) stays unaddressed with no follow-up captured."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D4 — Keep the legacyAuthFlow() rewrite inside this change, or defer it to a follow-up?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", complexity gate, scope item S4 (PLAN.md:27-28).\nELI10: legacyAuthFlow() is the code that logs users in today. The plan rewrites it in the same change that adds five new auth classes across 12 files. If anything in the rewrite differs from today's behavior, every existing user feels it at the same moment the new tenant code lands, and there is no single thing to roll back. A strangler approach adds the new services first, leaves the legacy function serving existing callers untouched, and migrates callers in a second, smaller change. This question decides scope only; how the legacy behavior gets test-protected is a separate Test review decision either way.\nStakes if we pick wrong: Keep it and a login regression is tangled with a 12-file refactor at rollback time; defer it and you carry two auth paths for one extra PR.\nRecommendation: B because auth is the highest-blast-radius code you own and incremental change (new path first, migrate second) makes a bad rewrite cheap to undo. (human: ~1 day saved now / CC: ~20 min either way)\nNote: options differ in kind, not coverage — no completeness score.\nNet: one bigger change with one rollback lever versus two smaller changes where legacy login is untouched until the new path is proven.": "Defer rewrite — strangler, legacy untouched (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:06:11.629Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01SemVi6JZGDiryPcgZTTaNK",
            "questions": [
              {
                "question": "D5 — Which class arrangement for the new auth services?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", complexity gate, findings S1-S3 (PLAN.md:11-12, 19, 35). legacyAuthFlow() rewrite is deferred per D4 in every option below.\nELI10: The plan adds five new classes (AuthBroker, SessionMint, AuthCache, TokenStore, RequestPolicy) across 12 files. But the cache adapter you already have does the tenant keying, expiry and invalidation. AuthCache is described as a thin wrapper over it, TokenStore is a second place tokens live, and RequestPolicy has no job described anywhere. Every extra class is another seam to test, mock and keep consistent. This chooses structure only: HOW the two services share the cache (a global export versus passing it in) stays pending for the Architecture section in every option.\nStakes if we pick wrong: Too many classes and you maintain three token-storage abstractions for one cache; too few and you refactor again when a real RequestPolicy contract shows up.\nRecommendation: A because the existing adapter already owns the tenant-key and invalidation contract; the two new services should call it, not wrap it twice. Promote a class only when code shows a distinct contract. (human: ~3 days / CC: ~30 min for A; human: ~1 week / CC: ~1 h for C)\nNote: options differ in kind, not coverage — no completeness score.\nNet: two services on the existing adapter versus keeping speculative layers you may never need.",
                "header": "Structure",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) 2 classes: AuthBroker + SessionMint on existing adapter (recommended)",
                    "description": "✅ One token store (the existing adapter), one set of invalidation semantics, no facade drift. ✅ Roughly 6-8 files instead of 12; RequestPolicy becomes a typed function/value inside AuthBroker until a real contract appears. ❌ If RequestPolicy or TokenStore has a distinct contract in code not shown here, you promote it later."
                  },
                  {
                    "label": "B) 3 classes: + AuthCache as the single service-facing seam",
                    "description": "✅ One explicit seam both services depend on, easy to fake in tests. ✅ Folds TokenStore and RequestPolicy; ~8-9 files. ❌ A facade over an adapter is a second interface to keep in sync with the adapter's invalidation hooks."
                  },
                  {
                    "label": "C) Original: 5 classes, 12 files as planned",
                    "description": "✅ No re-planning; every named component ships as drafted. ✅ Room for each class to grow its own responsibility. ❌ Three token-storage abstractions and an undefined RequestPolicy; largest test surface and blast radius for an auth change."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D5 — Which class arrangement for the new auth services?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", complexity gate, findings S1-S3 (PLAN.md:11-12, 19, 35). legacyAuthFlow() rewrite is deferred per D4 in every option below.\nELI10: The plan adds five new classes (AuthBroker, SessionMint, AuthCache, TokenStore, RequestPolicy) across 12 files. But the cache adapter you already have does the tenant keying, expiry and invalidation. AuthCache is described as a thin wrapper over it, TokenStore is a second place tokens live, and RequestPolicy has no job described anywhere. Every extra class is another seam to test, mock and keep consistent. This chooses structure only: HOW the two services share the cache (a global export versus passing it in) stays pending for the Architecture section in every option.\nStakes if we pick wrong: Too many classes and you maintain three token-storage abstractions for one cache; too few and you refactor again when a real RequestPolicy contract shows up.\nRecommendation: A because the existing adapter already owns the tenant-key and invalidation contract; the two new services should call it, not wrap it twice. Promote a class only when code shows a distinct contract. (human: ~3 days / CC: ~30 min for A; human: ~1 week / CC: ~1 h for C)\nNote: options differ in kind, not coverage — no completeness score.\nNet: two services on the existing adapter versus keeping speculative layers you may never need.": "A) 2 classes: AuthBroker + SessionMint on existing adapter (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:06:39.720Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01MFyaMqw2HruoSLS2VQj6Bn",
            "questions": [
              {
                "question": "D6 — How should AuthBroker and SessionMint get the shared cache adapter?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A1 (PLAN.md:19-20), ledger R1.\nELI10: Both new services need the same cache. The plan has them import one global object from a module and both change it. That works until a test needs a clean cache, a tenant needs a different backing store, or someone traces a bug and cannot see who else is touching the object. Injection means the cache is handed to each service when it is built, in one place, so the wiring is visible and swappable. This decides only how the adapter is shared; who is allowed to write to it (R2) and how requests are routed (R3) are separate.\nStakes if we pick wrong: Global export: order-dependent test failures and hidden coupling in the most sensitive code you have. Injection: a few extra constructor lines and one composition file.\nRecommendation: A because the dependency graph becomes explicit and each service is testable with a fake adapter with no global reset dance. (human: ~2 h / CC: ~5 min)\nNote: options differ in kind, not coverage — no completeness score.\nNet: a little wiring ceremony versus invisible shared state in auth.",
                "header": "Adapter DI",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Constructor injection, wired once at the composition root (recommended)",
                    "description": "✅ Each service unit-tests against a fake adapter with zero global state to reset. ✅ One place shows exactly which instance both services share; swapping per-tenant stores later is a one-line change. ❌ Adds a small composition/bootstrap step and two constructor parameters."
                  },
                  {
                    "label": "B) Keep the module-level export as planned",
                    "description": "✅ Least code; import and go. ✅ Matches the plan text exactly, no re-design. ❌ Tests share state across files and must reset it; coupling between the two services is invisible at the call site."
                  },
                  {
                    "label": "C) Service registry / locator lookup",
                    "description": "✅ Swappable at runtime without changing constructors. ✅ Central place to see registered instances. ❌ Hides dependencies behind a string/key lookup; a missing registration fails at call time, not at construction."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D6 — How should AuthBroker and SessionMint get the shared cache adapter?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A1 (PLAN.md:19-20), ledger R1.\nELI10: Both new services need the same cache. The plan has them import one global object from a module and both change it. That works until a test needs a clean cache, a tenant needs a different backing store, or someone traces a bug and cannot see who else is touching the object. Injection means the cache is handed to each service when it is built, in one place, so the wiring is visible and swappable. This decides only how the adapter is shared; who is allowed to write to it (R2) and how requests are routed (R3) are separate.\nStakes if we pick wrong: Global export: order-dependent test failures and hidden coupling in the most sensitive code you have. Injection: a few extra constructor lines and one composition file.\nRecommendation: A because the dependency graph becomes explicit and each service is testable with a fake adapter with no global reset dance. (human: ~2 h / CC: ~5 min)\nNote: options differ in kind, not coverage — no completeness score.\nNet: a little wiring ceremony versus invisible shared state in auth.": "A) Constructor injection, wired once at the composition root (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:08:11.020Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_013vAFXTmKoCWXwuhadxKLkv",
            "questions": [
              {
                "question": "D7 — Who may write to the shared adapter, and how is the revoke-then-late-write race closed?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A2 (PLAN.md:10, 20), ledger R2. Medium confidence (6/10): the adapter's write semantics are not visible in this repo, so verify the race exists before treating it as observed.\nELI10: The plan says the cache does not serialize writes and that both new services write to it. Picture SessionMint reading a tenant's entry, waiting on the IDP for 300 ms, then writing a fresh session. During that wait an admin suspends the tenant and the existing hook deletes the entry. SessionMint's write then lands and a suspended tenant has a live session again. Option A makes one service the only writer and has it re-check revocation right after writing; option B changes the adapter to reject stale writes; option C lives with it. This decides only write discipline; adapter sharing is already settled (D6: injection).\nStakes if we pick wrong: A suspended or logged-out tenant keeps a valid session until natural expiry. Silent, security-relevant, and only visible in incident review.\nRecommendation: A because it closes both interleavings without modifying the adapter the plan promises to keep unchanged, and it is a few lines plus one deterministic test. (human: ~4 h / CC: ~10 min)\nCompleteness: A=9/10, B=10/10, C=2/10\nNet: a small ownership rule and re-check now versus an invisible session-resurrection bug later.",
                "header": "Write race",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Single writer + post-write revocation re-check (recommended)",
                    "description": "✅ SessionMint is the only writer; AuthBroker gets a read-only adapter interface, so the service-vs-service interleaving cannot happen. ✅ After each write SessionMint re-reads revoke/suspend state and invalidates its own entry if a hook fired mid-await; adapter stays unchanged. ❌ A one-tick window remains between write and re-check; acceptable because the re-check self-heals it."
                  },
                  {
                    "label": "B) Check-and-set in the adapter",
                    "description": "✅ Stale writes are rejected at the storage layer, airtight for every current and future writer. ✅ No ownership convention for developers to remember. ❌ Modifies the adapter the plan promises to keep unchanged, so its existing tests and invalidation hooks are back in scope."
                  },
                  {
                    "label": "C) Accept the race, document it",
                    "description": "✅ Zero implementation cost now. ✅ Keeps the plan text as written. ❌ A revoked or suspended tenant can regain a live session with no error, no log, and no test."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D7 — Who may write to the shared adapter, and how is the revoke-then-late-write race closed?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A2 (PLAN.md:10, 20), ledger R2. Medium confidence (6/10): the adapter's write semantics are not visible in this repo, so verify the race exists before treating it as observed.\nELI10: The plan says the cache does not serialize writes and that both new services write to it. Picture SessionMint reading a tenant's entry, waiting on the IDP for 300 ms, then writing a fresh session. During that wait an admin suspends the tenant and the existing hook deletes the entry. SessionMint's write then lands and a suspended tenant has a live session again. Option A makes one service the only writer and has it re-check revocation right after writing; option B changes the adapter to reject stale writes; option C lives with it. This decides only write discipline; adapter sharing is already settled (D6: injection).\nStakes if we pick wrong: A suspended or logged-out tenant keeps a valid session until natural expiry. Silent, security-relevant, and only visible in incident review.\nRecommendation: A because it closes both interleavings without modifying the adapter the plan promises to keep unchanged, and it is a few lines plus one deterministic test. (human: ~4 h / CC: ~10 min)\nCompleteness: A=9/10, B=10/10, C=2/10\nNet: a small ownership rule and re-check now versus an invisible session-resurrection bug later.": "A) Single writer + post-write revocation re-check (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:09:07.731Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01LTUgZtQw46jcvLnBFtGPj3",
            "questions": [
              {
                "question": "D8 — How do requests get routed to AuthBroker while legacyAuthFlow() stays live?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A3, ledger R3. Follows from D4 (legacy rewrite deferred).\nELI10: Since the old login function stays in place, something has to decide which requests use the new AuthBroker path. A per-tenant flag lets you turn the new path on for one internal tenant, watch it, then widen; flipping it off is the rollback. Without a flag, the new path only runs where new code explicitly calls it, and there is no switch when something goes wrong at 3am. This decides routing only; everything else already approved stays fixed.\nStakes if we pick wrong: No flag and a bad AuthBroker release means a code revert and redeploy under incident pressure; with a flag it is a config flip.\nRecommendation: A because auth changes should roll out one tenant at a time with a config-level kill switch, and the same flag is the migration lever for the deferred legacy rewrite. (human: ~1 day / CC: ~15 min)\nCompleteness: A=10/10, B=5/10, C=7/10\nNet: a flag and a routing test now versus a redeploy-only rollback later.",
                "header": "Routing",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Per-tenant flag, default legacy, flip = kill switch (recommended)",
                    "description": "✅ Canary on one tenant, widen deliberately, roll back any single tenant by config. ✅ The same allowlist drives the deferred legacy migration tenant by tenant. ❌ One more config surface to read at request time and to test (flag on / off / missing)."
                  },
                  {
                    "label": "B) Only new call sites use AuthBroker, no flag",
                    "description": "✅ Simplest code; no flag plumbing. ✅ Legacy callers provably untouched. ❌ No runtime rollback; a faulty AuthBroker needs a code revert and redeploy."
                  },
                  {
                    "label": "C) One global flag for all tenants",
                    "description": "✅ Instant global kill switch. ✅ Less config than a per-tenant list. ❌ All-or-nothing: no canary tenant, and a flip affects every tenant at once."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D8 — How do requests get routed to AuthBroker while legacyAuthFlow() stays live?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Architecture finding A3, ledger R3. Follows from D4 (legacy rewrite deferred).\nELI10: Since the old login function stays in place, something has to decide which requests use the new AuthBroker path. A per-tenant flag lets you turn the new path on for one internal tenant, watch it, then widen; flipping it off is the rollback. Without a flag, the new path only runs where new code explicitly calls it, and there is no switch when something goes wrong at 3am. This decides routing only; everything else already approved stays fixed.\nStakes if we pick wrong: No flag and a bad AuthBroker release means a code revert and redeploy under incident pressure; with a flag it is a config flip.\nRecommendation: A because auth changes should roll out one tenant at a time with a config-level kill switch, and the same flag is the migration lever for the deferred legacy rewrite. (human: ~1 day / CC: ~15 min)\nCompleteness: A=10/10, B=5/10, C=7/10\nNet: a flag and a routing test now versus a redeploy-only rollback later.": "A) Per-tenant flag, default legacy, flip = kill switch (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:09:41.375Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01AmSryz5pmczKJWUFZR4oX9",
            "questions": [
              {
                "question": "D9 — How should validateAndDispatch() be restructured?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Code quality findings C1-C3 (PLAN.md:23-24), ledger R4.\nELI10: This one function checks a token and then acts on it, 60 lines deep with three nested try/catch blocks, and each catch quietly eats one kind of error. When the IDP is down, or a token is malformed, or a tenant policy is missing, all three look identical from outside: nothing happened. Option A splits it into a validate step that returns an explicit outcome (ok / invalid / unavailable) and a dispatch step that acts on it, with one place that maps error types to outcomes. Option B keeps the shape but makes every catch log and rethrow. This decides only the function's structure and error handling.\nStakes if we pick wrong: Silent auth failures are the ones that turn into multi-hour incidents because nothing points at the cause.\nRecommendation: A because it removes the nesting, states the three error classes once instead of three times, and makes every failure observable. (human: ~half day / CC: ~10 min)\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: a small structural refactor now versus debugging silent login failures by elimination later.",
                "header": "Dispatcher",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Split validate()/dispatch(), typed outcomes, one error map (recommended)",
                    "description": "✅ Each error class appears exactly once in a mapping table; nesting depth drops from 3 to 1. ✅ validate() is a pure-ish function that unit-tests directly for all three failure kinds plus success. ❌ Touches every caller of validateAndDispatch() to consume the new outcome type."
                  },
                  {
                    "label": "B) Keep shape, log + typed rethrow in each catch",
                    "description": "✅ Smallest diff; callers unchanged. ✅ Failures become visible in logs and to callers. ❌ Still 60 lines, still depth-3 nesting, still three copies of per-class handling to keep in sync."
                  },
                  {
                    "label": "C) Leave as is",
                    "description": "✅ Zero effort. ✅ No caller churn. ❌ Three classes of auth failure stay silent in production."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D9 — How should validateAndDispatch() be restructured?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Code quality findings C1-C3 (PLAN.md:23-24), ledger R4.\nELI10: This one function checks a token and then acts on it, 60 lines deep with three nested try/catch blocks, and each catch quietly eats one kind of error. When the IDP is down, or a token is malformed, or a tenant policy is missing, all three look identical from outside: nothing happened. Option A splits it into a validate step that returns an explicit outcome (ok / invalid / unavailable) and a dispatch step that acts on it, with one place that maps error types to outcomes. Option B keeps the shape but makes every catch log and rethrow. This decides only the function's structure and error handling.\nStakes if we pick wrong: Silent auth failures are the ones that turn into multi-hour incidents because nothing points at the cause.\nRecommendation: A because it removes the nesting, states the three error classes once instead of three times, and makes every failure observable. (human: ~half day / CC: ~10 min)\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: a small structural refactor now versus debugging silent login failures by elimination later.": "A) Split validate()/dispatch(), typed outcomes, one error map (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:10:27.070Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01MB1Tn3eu9GRwdm75tZ2q4Y",
            "questions": [
              {
                "question": "D10 — How should legacyAuthFlow()'s behavior be protected while the new services share its adapter?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Test finding T1 (PLAN.md:15-16, 27-28), ledger R5. Regression rule: this asks how to cover it, not whether.\nELI10: legacyAuthFlow() is not being rewritten anymore (D4), but two things around it change: a new service now writes into the same cache it reads, and a flag now decides whether a request even reaches it. A characterization test records what the legacy path does today (login works, logout/revoke/suspend kill the session, tenant A never sees tenant B) and re-asserts it with the new writer active. Behavior to preserve: those three things. Intentional differences: none. This decides only the depth of that regression suite.\nStakes if we pick wrong: A legacy login regression caused by the new writer ships unnoticed to every tenant NOT on the new path, which at launch is all of them.\nRecommendation: A because the new risk is exactly the interleaving and cross-tenant cases, and CC writes those extra cases in minutes. (human: ~1.5 days / CC: ~20 min)\nCompleteness: A=10/10, B=7/10, C=3/10\nNet: a full safety net under the code every current user runs versus a smoke check that misses the two new failure modes.",
                "header": "Legacy tests",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Full characterization + interleaved writes + tenant isolation (recommended)",
                    "description": "✅ Locks in login success and every failure class, all three invalidation hooks, and tenant isolation, each with SessionMint writes interleaved. ✅ Also asserts flag-off routing lands on legacy, so the strangler boundary itself is tested. ❌ Largest suite to write; needs a controllable fake adapter and hook triggers."
                  },
                  {
                    "label": "B) Parity + invalidation hooks only",
                    "description": "✅ Covers login success and logout/revoke/suspend for legacy sessions. ✅ Moderate suite size. ❌ Skips the two risks this change introduces: interleaved writes and cross-tenant reads."
                  },
                  {
                    "label": "C) Happy-path parity only",
                    "description": "✅ Quick to write. ✅ Catches an outright broken legacy login. ❌ Silent on invalidation, interleaving and isolation; a suspended tenant staying logged in would pass."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D10 — How should legacyAuthFlow()'s behavior be protected while the new services share its adapter?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Test finding T1 (PLAN.md:15-16, 27-28), ledger R5. Regression rule: this asks how to cover it, not whether.\nELI10: legacyAuthFlow() is not being rewritten anymore (D4), but two things around it change: a new service now writes into the same cache it reads, and a flag now decides whether a request even reaches it. A characterization test records what the legacy path does today (login works, logout/revoke/suspend kill the session, tenant A never sees tenant B) and re-asserts it with the new writer active. Behavior to preserve: those three things. Intentional differences: none. This decides only the depth of that regression suite.\nStakes if we pick wrong: A legacy login regression caused by the new writer ships unnoticed to every tenant NOT on the new path, which at launch is all of them.\nRecommendation: A because the new risk is exactly the interleaving and cross-tenant cases, and CC writes those extra cases in minutes. (human: ~1.5 days / CC: ~20 min)\nCompleteness: A=10/10, B=7/10, C=3/10\nNet: a full safety net under the code every current user runs versus a smoke check that misses the two new failure modes.": "A) Full characterization + interleaved writes + tenant isolation (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:11:28.872Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_014tyKVpZ8GaBUrTUL6xaAMU",
            "questions": [
              {
                "question": "D11 — How should the 5 IDP calls in token validation be issued?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Performance findings P1-P3 (PLAN.md:31-32), ledger R6.\nELI10: Every token check makes five trips to the identity provider, one after another, so a user waits five round trips. The plan says fire all five at once. That helps, but the bigger win is not making some of them at all: identity providers publish their settings and signing keys at well-known URLs that change rarely, so those get cached for minutes to hours (refreshing when an unknown key ID shows up), and a token already validated in the cache needs zero trips. What must still be fetched per token runs in parallel; if one fails, the others are cancelled and validation fails closed. This decides only the call strategy; fail-closed on IDP failure is already fixed.\nStakes if we pick wrong: Sequential: login latency stays 5x. Blind parallel: IDP load per login is unchanged, and a first-failure rejection leaves four requests in flight with no cancellation.\nRecommendation: A because deleting calls beats parallelizing them, and abort-on-first-failure keeps the fail-closed contract without leaking requests. (human: ~1 day / CC: ~15 min)\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: near-zero IDP traffic for warm tokens versus the same five calls, just faster.",
                "header": "IDP calls",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Cache-first, TTL-cache metadata/JWKS, parallel rest with abort (recommended)",
                    "description": "✅ Warm tokens make zero IDP calls; discovery and JWKS come from a TTL cache with refresh on unknown kid. ✅ Remaining per-token calls run via Promise.all; first rejection aborts the others through an AbortSignal, so nothing leaks. ❌ Requires classifying the five calls and adding a TTL cache for metadata."
                  },
                  {
                    "label": "B) Promise.all all 5 every validation",
                    "description": "✅ Latency drops from 5 round trips to 1 with a one-line change. ✅ Matches the plan text exactly. ❌ IDP request volume per login is unchanged, and in-flight calls keep running after the first failure."
                  },
                  {
                    "label": "C) Keep sequential",
                    "description": "✅ No change, simplest failure reasoning. ✅ Natural short-circuit: a failed first call skips the rest. ❌ Users pay 5x IDP latency on every login."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D11 — How should the 5 IDP calls in token validation be issued?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\", Performance findings P1-P3 (PLAN.md:31-32), ledger R6.\nELI10: Every token check makes five trips to the identity provider, one after another, so a user waits five round trips. The plan says fire all five at once. That helps, but the bigger win is not making some of them at all: identity providers publish their settings and signing keys at well-known URLs that change rarely, so those get cached for minutes to hours (refreshing when an unknown key ID shows up), and a token already validated in the cache needs zero trips. What must still be fetched per token runs in parallel; if one fails, the others are cancelled and validation fails closed. This decides only the call strategy; fail-closed on IDP failure is already fixed.\nStakes if we pick wrong: Sequential: login latency stays 5x. Blind parallel: IDP load per login is unchanged, and a first-failure rejection leaves four requests in flight with no cancellation.\nRecommendation: A because deleting calls beats parallelizing them, and abort-on-first-failure keeps the fail-closed contract without leaking requests. (human: ~1 day / CC: ~15 min)\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: near-zero IDP traffic for warm tokens versus the same five calls, just faster.": "A) Cache-first, TTL-cache metadata/JWKS, parallel rest with abort (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:12:36.201Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_014zZCZ7NRCJJ4tyDeEmMYat",
            "questions": [
              {
                "question": "D12 — TODO: \"Migrate legacyAuthFlow() callers to AuthBroker and delete the legacy path\"?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\"; follow-up created by D4 (legacy rewrite deferred). TODOS.md does not exist yet; option A creates it.\nELI10: We chose to leave the old login function in place and add the new path beside it. That means someone has to come back later, move tenants onto the new path with the per-tenant flag, and delete the old code. If that follow-up is not written down with its reasoning, the two paths quietly become permanent. What: migrate all tenants via the R3 flag, then remove legacyAuthFlow() and its characterization suite. Why: end the dual-path period and the duplicated validation (C4). Context: strangler deferral from this review; start by flipping the flag for internal tenants, watch AuthBroker error rates, widen, then delete. Effort: M. Priority: P2. Depends on: this change shipped and the flag proven on at least one tenant. Pros: captured with reasoning, no silent permanence. Cons: one more file to maintain. This is a bookkeeping question; it approves no code change.\nStakes if we pick wrong: Skip it and the dual path becomes permanent debt nobody remembers deciding on.\nRecommendation: A because the whole point of a strangler is that the second half actually happens.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a written follow-up versus trusting memory for an auth cleanup.",
                "header": "TODO",
                "multiSelect": false,
                "options": [
                  {
                    "label": "A) Add to TODOS.md (recommended)",
                    "description": "✅ The migration and its reasoning survive three months of other work. ✅ Gives /retro and /ship something to check against. ❌ Creates TODOS.md in the repo (after plan mode exits) as one more file to keep current."
                  },
                  {
                    "label": "B) Skip — not valuable enough",
                    "description": "✅ No new file. ✅ Nothing to maintain. ❌ The deferred half of the strangler lives only in this review report."
                  },
                  {
                    "label": "C) Build it now in this PR instead of deferring",
                    "description": "✅ One code path at the end of this change. ✅ No follow-up to schedule. ❌ Reverses D4: the legacy rewrite comes back into the same 6-8 file change with the same rollback tangling."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D12 — TODO: \"Migrate legacyAuthFlow() callers to AuthBroker and delete the legacy path\"?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\"; follow-up created by D4 (legacy rewrite deferred). TODOS.md does not exist yet; option A creates it.\nELI10: We chose to leave the old login function in place and add the new path beside it. That means someone has to come back later, move tenants onto the new path with the per-tenant flag, and delete the old code. If that follow-up is not written down with its reasoning, the two paths quietly become permanent. What: migrate all tenants via the R3 flag, then remove legacyAuthFlow() and its characterization suite. Why: end the dual-path period and the duplicated validation (C4). Context: strangler deferral from this review; start by flipping the flag for internal tenants, watch AuthBroker error rates, widen, then delete. Effort: M. Priority: P2. Depends on: this change shipped and the flag proven on at least one tenant. Pros: captured with reasoning, no silent permanence. Cons: one more file to maintain. This is a bookkeeping question; it approves no code change.\nStakes if we pick wrong: Skip it and the dual path becomes permanent debt nobody remembers deciding on.\nRecommendation: A because the whole point of a strangler is that the second half actually happens.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a written follow-up versus trusting memory for an auth cleanup.": "A) Add to TODOS.md (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:13:29.996Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "toolUseId": "toolu_01TPm69Hh2p8yVMCTxbDYVzF",
            "questions": [
              {
                "question": "D13 — What next after this engineering review?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\" is ENG CLEARED (scope reduced, 0 unresolved decisions, 0 critical gaps).\nELI10: The engineering review is done and saved. You can start building now (T1 characterization suite first, then the parallel lanes), or run an optional CEO review first to pin down the goal and success criteria the plan never states. Navigation only: this does not change any approved decision or task ordering.\nStakes if we pick wrong: Nothing irreversible either way; a CEO review costs ~10 minutes, skipping it means the plan's \"why\" stays implicit.\nRecommendation: C because this is an internal auth refactor with no product-direction change; the missing goal statement is a doc gap, not a strategy question.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start implementing now versus a short strategy pass first.",
                "header": "Next step",
                "multiSelect": false,
                "options": [
                  {
                    "label": "C) Ready to implement — run /ship when done (recommended)",
                    "description": "✅ T1 baseline capture can start immediately; lanes B, C, D run in parallel worktrees. ✅ All remedies approved with a regression contract; nothing waits on another review. ❌ The plan's goal/success criteria stay implicit (S5) unless you add a sentence yourself."
                  },
                  {
                    "label": "B) Run /plan-ceo-review first",
                    "description": "✅ Pins down the goal, success criteria and rollout story the plan omits. ✅ Checks whether multi-tenant auth is the right thing to build now. ❌ ~10 minutes before implementation for a change that does not alter product direction."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D13 — What next after this engineering review?\nProject/branch/task: main; PLAN.md \"Multi-tenant Auth Refactor\" is ENG CLEARED (scope reduced, 0 unresolved decisions, 0 critical gaps).\nELI10: The engineering review is done and saved. You can start building now (T1 characterization suite first, then the parallel lanes), or run an optional CEO review first to pin down the goal and success criteria the plan never states. Navigation only: this does not change any approved decision or task ordering.\nStakes if we pick wrong: Nothing irreversible either way; a CEO review costs ~10 minutes, skipping it means the plan's \"why\" stays implicit.\nRecommendation: C because this is an internal auth refactor with no product-direction change; the missing goal statement is a doc gap, not a strategy question.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start implementing now versus a short strategy pass first.": "C) Ready to implement — run /ship when done (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:16:37.715Z"
          }
        ],
        "assistantMessages": [
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Scope gate: plan mode — auto-selected B (reviewing `PLAN.md`: \"Multi-tenant Auth Refactor\").",
            "timestamp": "2026-09-16T01:02:00.334Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Noted: routing rules go into CLAUDE.md, committed, once we exit plan mode (plan mode blocks that edit right now). Continuing the preamble.",
            "timestamp": "2026-09-16T01:02:25.942Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "No worries — standard review. If you ever want sharper input, try /office-hours first next time.\n\nNow reading the review sections in full before Step 0.",
            "timestamp": "2026-09-16T01:03:19.496Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Section read in full. Preparing: report destination, prior learnings, test-framework detection.",
            "timestamp": "2026-09-16T01:03:44.976Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "No prior learnings found. Codex reviews are disabled in config (Outside Voice will be recorded as skipped later). Running the Scope Challenge search check via WebSearch since Aside is not installed.",
            "timestamp": "2026-09-16T01:05:12.407Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "## Step 0: Scope Challenge\n\n**Evidence baseline.** This repo holds only `CLAUDE.md` and `PLAN.md`; the auth codebase the plan describes is not checked in here. Every finding below is a plan-text finding (`PLAN.md:line`), and runtime evidence is **unknown** unless stated. Confidence is capped accordingly.\n\n**1. What already exists.** The existing cache adapter already does tenant/issuer/audience/policy-version keying, expiry eviction, and invalidation on logout/revocation/suspension (`PLAN.md:7-9`). The plan then adds `AuthCache` as a facade over it (`PLAN.md:11-12`) AND a separate `TokenStore` (`PLAN.md:35`). That is three token-holding abstractions where one exists today. `RequestPolicy` has no stated contract anywhere in the plan.\n\n**2. Minimum change.** The plan never states the goal (\"multi-tenant\" is in the title only). The smallest change that plausibly delivers it: `AuthBroker` + `SessionMint` calling the existing adapter directly (injected), plus the multi-tenant behavior. Facade, `TokenStore`, and `RequestPolicy` are unmotivated in the text.\n\n**3. Complexity check: TRIGGERED.** 12 files, and 5 new classes once you count `AuthBroker` (named at `PLAN.md:19` but missing from the \"4 new classes\" list at `PLAN.md:35-36`). Gate below.\n\n**4. Search check** (WebSearch; Aside not installed):\n- Module-level singleton cache shared by two mutating services: known testing and request-scope pitfalls; DI keeps the graph explicit. **[Layer 1]** inject the adapter. Sources: [Singletons in JavaScript: Useful Tool or Hidden Trap?](https://blog.openreplay.com/singletons-javascript-tool-trap/), [Singleton, DI, IoC in Node.js](https://medium.com/@moali314/singleton-dependency-injection-ioc-and-service-locator-in-node-js-9a9c7a3326b7), [Module Caching in Node.js](https://www.linkedin.com/pulse/module-caching-nodejs-practical-singleton-jo%C3%A3o-pedro-samarino-usidf)\n- `Promise.all` is right when all results are required (auth is an all-must-succeed case); `allSettled` when partial success is acceptable. **[Layer 1]** Sources: [MDN Promise.all](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all), [Promise.all vs allSettled](https://andrewusher.dev/blog/promise-all-vs-promise-allsettled)\n- OIDC guidance: cache the discovery document for hours and JWKS for minutes-to-hours keyed by `kid`, never refetch per request. If any of the 5 IDP calls are metadata/JWKS fetches, parallelizing them is the wrong fix; caching removes them. **[Layer 1]** Sources: [Amazon Cognito: Verifying JWTs](https://docs.aws.amazon.com/cognito/latest/developerguide/amazon-cognito-user-pools-using-tokens-verifying-a-jwt.html), [Caching OIDC discovery metadata](https://oneuptime.com/blog/post/2026-03-31-redis-openid-connect-discovery-metadata/view), [JWKS on the edge](https://dev.to/authagonal/every-token-validation-hit-our-origin-now-the-jwks-lives-on-the-edge-nfg)\n\n**5. TODOS.md:** does not exist. **7. Distribution:** no new artifact, N/A.\n\n**6. Completeness:** the plan takes three shortcuts that are minutes with CC: no regression test for `legacyAuthFlow()` (`PLAN.md:27-28`), swallowed error classes (`PLAN.md:23-24`), sequential IDP calls (`PLAN.md:31-32`). Each gets a decision in Sections 2-4.\n\n### Scope Challenge findings\n\n| # | Sev | Conf | Source | Finding | Disposition |\n|---|---|---|---|---|---|\n| S1 | P1 | 8/10 | `PLAN.md:19,35` | 5 new classes across 12 files for one auth change; `AuthBroker` omitted from the class count. Complexity gate triggered. | pending (D5) |\n| S2 | P2 | 7/10 | `PLAN.md:7-12,35` | `AuthCache` facade + `TokenStore` + existing adapter = three token-storage abstractions; plan gives no distinct contract for the extra two. | pending (D5) |\n| S3 | P2 | 6/10 | `PLAN.md:35` | `RequestPolicy` has no stated responsibility. Medium confidence, verify this is actually an issue (the class may be motivated in code not shown). | pending (D5) |\n| S4 | P1 | 8/10 | `PLAN.md:27-28` | Rewriting `legacyAuthFlow()` inside the same 12-file change is a big-bang auth migration; strangler-style deferral is available. | pending (D4) |\n| S5 | P3 | 9/10 | `PLAN.md:4` | Plan states no goal, success criteria, or rollout/flag strategy for an auth change. Factual gap; recorded, no question. | accepted as note |\n\nTwo complexity-gate questions follow: first the one deferrable feature (S4), then structure (S1-S3).",
            "timestamp": "2026-09-16T01:05:57.434Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "## Section 1: Architecture review\n\n```\n                 ┌──────────────────────┐        ┌───────────────┐\n request ──────▶ │ AuthBroker           │──────▶ │ IDP (5 calls) │\n (tenant, token) │  validate → dispatch │◀────── │               │\n                 └───────┬──────────────┘        └───────────────┘\n                         │ read / invalidate\n                         ▼\n                 ┌──────────────────────┐   ◀── logout / revoke / suspend hooks\n                 │ existing cache       │        (unchanged)\n                 │ adapter (tenant key) │\n                 └───────▲──────────────┘\n                         │ write (mint)\n                 ┌───────┴──────────────┐\n                 │ SessionMint          │\n                 └──────────────────────┘\n legacy callers ──▶ legacyAuthFlow() ──▶ same adapter (unchanged, D4)\n```\n\n| # | Sev | Conf | Source | Finding |\n|---|---|---|---|---|\n| A1 | P1 | 8/10 | `PLAN.md:19-20` \"share a global mutable AuthCache instance via module-level export. Both services mutate it.\" | Module-level shared mutable singleton: hidden coupling between the two services, state leaks between tests and requests, no way to give one tenant path a different adapter. Choice R1. |\n| A2 | P1 | 6/10 | `PLAN.md:10` \"they do not serialize mutations\" + `PLAN.md:20` \"Both services mutate it.\" | Two async writers on an unserialized cache: SessionMint reads → awaits IDP → writes; a revoke/suspend invalidation lands in between; the late write resurrects a revoked entry. Medium confidence, verify this is actually an issue (depends on adapter write semantics not shown). Choice R2. |\n| A3 | P2 | 7/10 | `PLAN.md:4`, D4 deferral | With the legacy path retained, nothing in the plan says how a request reaches `AuthBroker` instead of `legacyAuthFlow()`. No flag, no kill switch. Choice R3. |\n| A4 | P2 | 7/10 | `PLAN.md:31` \"5 sequential API calls to the IDP\" | Production failure: IDP timeout mid-validation. Token validation must fail closed (cannot validate ⇒ not valid) with a typed error and no stale-serve. This is the existing validation contract, so it is carried as required work, no question; its proof is a test requirement in Section 3. |\n| A5 | P3 | 9/10 | `PLAN.md` (whole) | No data-flow diagram in the plan. Added above; `AuthBroker` and `SessionMint` should carry an inline ASCII comment of the same flow. Factual, no question. |\n\nSaving R1 to the ledger, then asking.",
            "timestamp": "2026-09-16T01:07:47.299Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Applying R1 (D6 = A) and saving R2 before asking.",
            "timestamp": "2026-09-16T01:08:13.949Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Applying R4 (D9 = A). Section 2 complete: 5 findings, 1 decision resolved.\n\n## Section 3: Test review\n\n**Framework detection:** `CLAUDE.md` has no `## Testing` section; the repo has no `package.json`, `pyproject.toml`, `Gemfile`, `go.mod`, or test files (`TESTFILES:0`). Framework **unknown**; `Promise.all` in the plan implies a JS/TS runtime. Test file names below follow `*.test.ts`; adapt to the real convention.\n\n```\nCODE PATHS                                                      USER FLOWS\n[+] auth/composition-root                                       [+] Login, tenant on flag allowlist\n  └── build adapter once, inject into both services              ├── [GAP] [→E2E] valid token → session minted → dispatched\n      ├── [GAP] both services receive the same instance          ├── [GAP] [→E2E] expired token → typed `invalid`, clear error\n      └── [GAP] fake adapter in unit tests, no global reset      └── [GAP] [→E2E] IDP down → typed `unavailable`, fail closed\n[+] auth/routing (R3 flag)                                     [+] Login, tenant NOT on allowlist / flag missing\n  ├── [GAP] flag on  → AuthBroker                                ├── [GAP] [→E2E] routes to legacyAuthFlow(), behavior identical\n  ├── [GAP] flag off → legacyAuthFlow()                          └── [GAP]        flag store unreadable → legacy (fail safe)\n  ├── [GAP] flag missing/unreadable → legacyAuthFlow()         [+] Revocation while minting (R2)\n  └── [GAP] tenant absent from list → legacyAuthFlow()           ├── [GAP] [→E2E] suspend hook fires mid-await → no live session\n[+] auth/AuthBroker                                              └── [GAP]        logout during mint → entry absent\n  ├── validate()  (R4)                                         [+] Legacy callers (D4, untouched) — REGRESSION, R5 pending\n  │   ├── [GAP] ok                                               ├── [GAP] CRITICAL legacy login parity with SessionMint writes present\n  │   ├── [GAP] invalid (malformed / expired / wrong aud)        ├── [GAP] CRITICAL logout/revoke/suspend still invalidate for legacy\n  │   ├── [GAP] unavailable (IDP timeout / 5xx) → fail closed    └── [GAP] CRITICAL tenant-key isolation: tenant A never sees B\n  │   └── [GAP] error-map table: each class → exactly one outcome\n  ├── dispatch()                                               Concurrency / interaction\n  │   ├── [GAP] ok → downstream call                              ├── [GAP] double-submit same tenant/subject → one session, idempotent\n  │   └── [GAP] non-ok → typed error surfaced, logged once        └── [GAP] two tenants in parallel → no cross-tenant cache hit\n  └── [GAP] read-only adapter type: write call fails to compile\n[+] auth/SessionMint (R2 single writer)\n  ├── [GAP] mint writes entry keyed tenant/issuer/aud/policy\n  ├── [GAP] post-write re-check: hook fired → self-invalidate\n  └── [GAP] post-write re-check: no hook → entry retained\n[+] auth/idp-client (Section 4, pending)\n  ├── [GAP] 5 calls in parallel, all ok\n  ├── [GAP] one call fails → whole validation fails closed\n  └── [GAP] cacheable metadata (discovery/JWKS) served from cache\n\nExisting (unchanged, plan `PLAN.md:12-13`): adapter keying / eviction / invalidation tests — [EXISTING, quality unknown: not in repo]\n\nCOVERAGE: 0/31 planned paths tested (0%)  |  Code paths: 0/20  |  User flows: 0/11\nQUALITY: ★★★:0 ★★:0 ★:0 (existing adapter tests not visible)  |  GAPS: 31 (7 E2E, 0 eval, 3 CRITICAL regression)\n```\n\nLegend: ★★★ behavior + edge + error | ★★ happy path | ★ smoke | [→E2E] integration test | CRITICAL = regression protection.\n\n**LLM/eval scope:** none; no prompt or LLM files touched.\n\n**Regression rule (IRON RULE):** `legacyAuthFlow()` is untouched (D4) but its inputs change: a new writer (`SessionMint`) shares its adapter, and a routing flag now sits in front of it. Behavior at risk: existing login success/failure, invalidation on logout/revoke/suspend, tenant-key isolation. Intentional differences: none. Coverage contract is pending R5 (D10).\n\nProofs already carried from approved behaviors (no new question): R2 interleaving + read-only type test, R3 four routing cases, R4 outcome-per-error-class tests, A4 fail-closed on IDP failure.",
            "timestamp": "2026-09-16T01:10:57.948Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Applying R5 (D10 = A) and writing the Test Plan Artifact.",
            "timestamp": "2026-09-16T01:11:34.060Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Section 4 complete: 4 findings, 1 decision resolved.\n\n## Outside Voice",
            "timestamp": "2026-09-16T01:12:51.281Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Codex review skipped (codex_reviews disabled). Re-enable: `gstack-config set codex_reviews enabled`.",
            "timestamp": "2026-09-16T01:13:01.070Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "## Final planning decisions: TODOs",
            "timestamp": "2026-09-16T01:13:10.979Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Approval readiness check against the ledger, then the full report write.",
            "timestamp": "2026-09-16T01:13:43.984Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Read-back gate: verifying the saved file.",
            "timestamp": "2026-09-16T01:15:22.586Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Read-back passed. Logging the review, the architecture decision, and JSONL tasks, then the dashboard.",
            "timestamp": "2026-09-16T01:15:40.237Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "Review complete and persisted. Writing the host plan file (a copy of the reviewed plan) and displaying the dashboard.",
            "timestamp": "2026-09-16T01:16:10.028Z"
          },
          {
            "sessionId": "0a55cdfb-bd64-4fd6-813f-bffd101795a4",
            "text": "All relevant reviews complete. Run /ship when ready.\n\nLearning hooks, telemetry, and cache refresh.",
            "timestamp": "2026-09-16T01:16:40.940Z"
          }
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            "timestamp": "2026-09-16T01:17:05.112Z",
            "failed": false
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      "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\nReviewed target: `PLAN.md` (\"Multi-tenant Auth Refactor\") in the plan-review fixture repo, branch `main`, commit `8fe8db6`.\nReview: `/plan-eng-review`, 2026-09-16. Evidence note: the auth codebase the plan describes is not checked into this repo; all findings cite plan text (`PLAN.md:line`) and runtime evidence is unknown unless stated.\n\n## Context\nThe plan introduces two new auth services for multi-tenant token handling on top of an existing cache adapter that already keys entries by tenant ID, issuer, audience and policy version and already invalidates on logout, revocation and tenant suspension. The review reduced scope (D4, D5): the `legacyAuthFlow()` rewrite is deferred to a follow-up (strangler migration), and the new work is two classes (`AuthBroker`, `SessionMint`) calling the existing adapter directly instead of five classes across 12 files.\n\n## Existing contracts retained\nThe existing cache adapter keys entries by tenant ID, issuer, audience,\nand policy version. It evicts expired tokens and invalidates entries on\nlogout, token revocation, or tenant suspension. These validity and tenant-key\nrules are unchanged; the adapter does not serialize mutations.\nThe adapter, its invalidation hooks, and their existing tests remain in use unchanged.\nUnit and integration coverage is planned for the new components and their\nsuccess/error paths.\n\n## Architecture\nTwo new services, `AuthBroker` and `SessionMint`, use the existing cache adapter\ndirectly (D5: the `AuthCache` facade, `TokenStore` and `RequestPolicy` classes are\nfolded; `RequestPolicy` becomes a typed value/function inside `AuthBroker` until a\ndistinct contract appears in code). How the two services obtain the shared adapter\n(module-level export vs. injection) is pending R1 below.\n\n## Code quality\nThe `validateAndDispatch()` function is 60 lines with three nested\ntry/catch blocks; each catch swallows a different error class.\n\n## Tests\n`legacyAuthFlow()` is NOT rewritten in this change (D4). It keeps serving existing\ncallers unchanged while the new services land. Regression coverage for its behavior\nagainst the shared adapter is pending the Test review.\n\n## Performance\nToken validation issues 5 sequential API calls to the IDP; they could be\nparallelized via Promise.all (calls are independent).\n\n## Scope (resolved)\nOriginal: 12 files, 5 new classes (`AuthBroker`, `SessionMint`, `AuthCache`, `TokenStore`, `RequestPolicy`).\nAccepted (D5-A): 2 new classes (`AuthBroker`, `SessionMint`), roughly 6-8 files.\nDeferred (D4-A): `legacyAuthFlow()` rewrite → follow-up migration PR.\n\n## Decision ledger\n\n### Scope answers (imported from the complexity gate; no grid, per Scope Challenge rules)\n- **D4** — legacyAuthFlow() rewrite: **Defer (strangler, legacy untouched)**. Finding S4 [P1] (8/10) `PLAN.md:27-28`. Accepted scope: remove the rewrite from this change; legacy callers untouched; migration is follow-up work.\n- **D5** — class arrangement: **A) 2 classes: AuthBroker + SessionMint on the existing adapter**. Findings S1 [P1] (8/10) `PLAN.md:19,35`, S2 [P2] (7/10) `PLAN.md:7-12,35`, S3 [P2] (6/10) `PLAN.md:35`. Accepted scope: drop `AuthCache` facade, `TokenStore`, `RequestPolicy` classes; RequestPolicy is a typed value inside AuthBroker. Sharing mechanism for the adapter stays pending (R1).\n- S5 [P3] (9/10) `PLAN.md:4` — plan states no goal/success criteria/rollout strategy: factual note, no question.\n\n### R1: How AuthBroker and SessionMint obtain the shared cache adapter\nFinding: A1 [P1] (confidence 8/10) `PLAN.md:19-20` — reviewer: Claude (native)\nPlan baseline: module-level export of a global mutable instance, both services import and mutate it (original proposal; no approval yet)\nRuntime evidence: unknown (auth codebase not in this repo)\nState: pending\nComparison grid:\n\n| Choice | Current | A (inject) | B (module export) | C (registry/locator) |\n|---|---|---|---|---|\n| R1 adapter sharing | module-level global, pending | constructor injection of the adapter instance; composition root wires one instance | keep module-level export | central registry lookup at call time |\n| R2 write discipline | unserialized, pending | pending | pending | pending |\n| R3 routing flag | unspecified, pending | pending | pending | pending |\n| D5 structure | 2 classes (approved D5) | fixed | fixed | fixed |\n\nQuestion D6: \"How should AuthBroker and SessionMint get the shared cache adapter?\" Options: A) Constructor injection, one instance wired at the composition root (recommended); B) Keep the module-level export as planned; C) Service registry / locator lookup. Recommendation: A because the dependency graph becomes explicit and each service is testable with a fake adapter without global resets.\nActual answer: **A — Constructor injection, wired once at the composition root** (D6)\nAccepted scope: remove the module-level `AuthCache` export; `AuthBroker` and `SessionMint` take the adapter as a constructor parameter; one composition-root module constructs the adapter once and passes it to both; unit tests construct each service with a fake adapter. Tests and docs for this wiring are part of the same accepted work.\nHistory: none\n\n### R2: Write discipline on the shared, unserialized adapter\nFinding: A2 [P1] (confidence 6/10) `PLAN.md:10` \"they do not serialize mutations\" + `PLAN.md:20` \"Both services mutate it.\" — reviewer: Claude (native). Medium confidence: adapter write semantics not visible.\nPlan baseline: both services mutate the adapter; no ordering or ownership rule (original proposal)\nRuntime evidence: unknown; scenario is a pattern match (read → await IDP → write racing an invalidation hook)\nState: pending\nComparison grid:\n\n| Choice | Current | A (single writer) | B (check-and-set) | C (accept, document) |\n|---|---|---|---|---|\n| R2 write discipline | both write, unserialized | SessionMint is the only writer (AuthBroker gets a read-only adapter view); after each mint write SessionMint re-checks revocation/suspension state and invalidates its own entry if a hook fired during the await | adapter write compares invalidation generation/policy version; stale write rejected | no change; race documented in plan |\n| Existing adapter | unchanged (plan contract) | unchanged | modified (breaks \"adapter unchanged\") | unchanged |\n| R1 adapter sharing | injection (D6) | fixed | fixed | fixed |\n| R3 routing flag | pending | pending | pending | pending |\n\nQuestion D7: \"Who may write to the shared adapter, and how is the revoke-then-late-write race prevented?\" Options: A) Single writer (SessionMint) with a post-write revocation re-check; AuthBroker reads via a read-only interface (recommended); B) Add check-and-set (invalidation generation) to the adapter; C) Accept the race and document it. Recommendation: A because it removes service-vs-service interleaving by construction and closes the hook-vs-mint window without touching the adapter the plan promises to keep unchanged.\nActual answer: **A — Single writer + post-write revocation re-check** (D7; Completeness 9/10)\nAccepted scope: `SessionMint` is the only adapter writer; `AuthBroker` receives a read-only adapter interface type (compile-time enforced) and triggers invalidation only through the existing hooks; after every mint write `SessionMint` re-reads revocation/suspension state for that tenant/subject and invalidates its own entry if a hook fired during the await. Required proof (carried, no further question): a deterministic interleaving test that fires the suspend hook between SessionMint's read and write and asserts the entry is absent afterwards; a type-level test that AuthBroker cannot call the write API.\nHistory: none\n\n### R3: How requests reach AuthBroker while legacyAuthFlow() stays live\nFinding: A3 [P2] (confidence 7/10) `PLAN.md:4` (no rollout strategy) + D4 deferral — reviewer: Claude (native)\nPlan baseline: unspecified; original plan replaced legacyAuthFlow() outright, D4 deferred that\nRuntime evidence: unknown\nState: pending\nComparison grid:\n\n| Choice | Current | A (per-tenant flag) | B (new callers only) | C (global flag) |\n|---|---|---|---|---|\n| R3 routing | unspecified, pending | per-tenant allowlist flag selects AuthBroker; default legacy; flag flip is the kill switch | only new call sites use AuthBroker; legacy callers hard-wired to legacyAuthFlow() | one global on/off flag for all tenants |\n| D4 legacy deferral | deferred (approved) | fixed | fixed | fixed |\n| R1 / R2 | injection / single writer (approved) | fixed | fixed | fixed |\n\nQuestion D8: \"How do requests get routed to AuthBroker while legacyAuthFlow() stays live?\" Options: A) Per-tenant flag, default legacy, flag flip = kill switch (recommended); B) Only new call sites use AuthBroker, no flag; C) One global flag for all tenants. Recommendation: A because it gives a canary (one tenant), an instant rollback, and a migration path for the deferred rewrite.\nActual answer: **A — Per-tenant flag, default legacy, flip = kill switch** (D8; Completeness 10/10)\nAccepted scope: a per-tenant allowlist flag read at the auth entry point; tenants on the list route to `AuthBroker`, all others (and a missing/unreadable flag) route to `legacyAuthFlow()`; flag flip is the rollback. Required proof (carried): routing tests for flag on, flag off, flag missing/unreadable (must fall back to legacy), and tenant not on list.\nHistory: none\n\n### R4: Structure and error handling of validateAndDispatch()\nFinding: C1 [P1] (8/10), C2 [P2] (8/10), C3 [P2] (7/10) `PLAN.md:23-24` — reviewer: Claude (native)\nPlan baseline: 60-line function, three nested try/catch, each catch swallows one error class (original proposal)\nRuntime evidence: unknown (function not in this repo)\nState: pending\nComparison grid:\n\n| Choice | Current | A (split + typed outcomes) | B (log + rethrow in place) | C (leave as is) |\n|---|---|---|---|---|\n| R4 structure | one 60-line function, depth-3 nesting | `validate()` returns a discriminated union (`ok` / `invalid` / `unavailable`), `dispatch()` consumes it; one error boundary maps error classes via a single table | keep shape; each catch logs with tenant/subject context and rethrows a typed `AuthError` | unchanged |\n| Error visibility | swallowed | every failure surfaced as a typed outcome and logged once | logged and propagated | swallowed |\n| R1-R3, D4, D5 | approved | fixed | fixed | fixed |\n\nQuestion D9: \"How should validateAndDispatch() be restructured?\" Options: A) Split into validate()/dispatch() with typed outcomes and one error-mapping boundary (recommended); B) Keep the shape, replace each swallow with log + typed rethrow; C) Leave as is. Recommendation: A because it removes the nesting, states the three error classes once, and makes every failure observable; effort is minutes with CC.\nActual answer: **A — Split validate()/dispatch(), typed outcomes, one error map** (D9; Completeness 10/10)\nAccepted scope: `validateAndDispatch()` becomes `validate(): Promise<ValidationOutcome>` (discriminated union `ok | invalid | unavailable`, each carrying a typed reason) and `dispatch(outcome)`; one error-mapping table converts the three caught error classes to outcomes; every non-ok outcome is logged once with tenant/subject context; nothing is swallowed. Callers updated to consume the outcome type. Required proof (carried): unit tests for success and each of the three failure classes, asserting exactly one outcome and one log line each; dispatch tests for ok and each non-ok outcome.\nHistory: none\n\n### R5: Regression contract for legacyAuthFlow() (IRON RULE)\nFinding: T1 [P1] (confidence 8/10) `PLAN.md:27-28` \"no regression test for the prior behavior is planned\" + `PLAN.md:15-16` \"does not exercise legacyAuthFlow() or assert compatibility\" — reviewer: Claude (native)\nPlan baseline: no regression coverage (original proposal). D4 deferred the rewrite, but the function's shared adapter gains a new writer (R2) and a routing flag sits in front of it (R3), so behavior remains at risk.\nRuntime evidence: unknown (legacyAuthFlow() and existing tests not in this repo)\nState: pending\nBehavior to preserve: existing login success/failure outcomes for tenants not on the flag; invalidation on logout, revoke, suspend still takes effect for legacy sessions; tenant-key isolation (tenant A never reads tenant B's entry) with SessionMint writes present. Intentional differences: none.\nComparison grid:\n\n| Choice | Current | A (full characterization) | B (parity + invalidation) | C (happy-path parity) |\n|---|---|---|---|---|\n| R5 regression coverage | none | characterization suite: golden login success + each failure class, all three invalidation hooks, tenant isolation, each run with SessionMint writes interleaved, plus flag-off routing lands on legacy | login success + three invalidation hooks; no interleaving, no isolation | login success only |\n| R1-R4, D4, D5 | approved | fixed | fixed | fixed |\n\nQuestion D10: \"How should legacyAuthFlow()'s behavior be protected while the new services share its adapter?\" Options: A) Full characterization suite with interleaved SessionMint writes and tenant isolation (recommended); B) Parity + invalidation hooks only; C) Happy-path parity only. Recommendation: A because the new risk is exactly the interleaving and cross-tenant cases, and CC writes the extra cases in minutes.\nActual answer: **A — Full characterization + interleaved writes + tenant isolation** (D10; Completeness 10/10)\nAccepted scope: **CRITICAL** regression suite `legacyAuthFlow.characterization.test.*`: (1) login success for a flag-off tenant; (2) each existing failure class returns the same outcome as today; (3) logout, revoke, suspend each invalidate the legacy session; (4) tenant A never reads tenant B's entry; (5) cases 1-4 repeated with SessionMint writes interleaved for another tenant and for the same tenant; (6) flag-off / flag-missing routing lands on legacyAuthFlow(). Intentional differences: none. Assertions compare against outcomes captured from the current implementation before any change lands.\nHistory: none\n\n### R6: IDP call strategy in token validation\nFinding: P1 [P2] (8/10), P2 [P2] (7/10), P3 [P3] (6/10) `PLAN.md:31-32` — reviewer: Claude (native)\nPlan baseline: 5 sequential IDP calls per validation; plan proposes Promise.all (original proposal)\nRuntime evidence: unknown (which 5 calls, and whether any are discovery/JWKS, not visible)\nState: pending\nComparison grid:\n\n| Choice | Current | A (classify: cache + parallel) | B (Promise.all all 5) | C (keep sequential) |\n|---|---|---|---|---|\n| R6 IDP strategy | 5 sequential | check adapter first (cached validation → 0 calls); classify the 5: metadata/JWKS fetched via TTL cache (refresh on unknown kid), remaining per-token calls run with Promise.all; on first rejection abort the others via AbortSignal | all 5 in Promise.all every validation | unchanged |\n| Failure semantics (A4, fixed) | fail closed | fail closed, typed `unavailable` | fail closed, typed `unavailable` | fail closed |\n| R1-R5, D4, D5 | approved | fixed | fixed | fixed |\n\nQuestion D11: \"How should the 5 IDP calls be issued?\" Options: A) Cache-first, TTL-cache metadata/JWKS, Promise.all the rest with abort on first failure (recommended); B) Promise.all all 5 every time; C) Keep sequential. Recommendation: A because removing calls beats parallelizing them, and parallel-with-abort keeps the fail-closed contract without leaking in-flight requests.\nActual answer: **A — Cache-first, TTL-cache metadata/JWKS, parallel rest with abort** (D11; Completeness 10/10)\nAccepted scope: `AuthBroker.validate()` consults the injected adapter first (cached, unexpired, un-invalidated entry ⇒ no IDP call). The 5 IDP calls are classified during implementation: discovery/metadata and JWKS fetches move behind a TTL cache (discovery ~hours, JWKS ~minutes-hours, refresh once on unknown `kid`, no unbounded refetch loop); remaining per-token calls run via `Promise.all` sharing one `AbortSignal`; first rejection aborts the rest and yields the typed `unavailable`/`invalid` outcome (fail closed, A4). Unknown recorded: which of the 5 calls are cacheable; resolve by reading the IDP client before implementing. Required proof (carried): tests for cache hit ⇒ zero IDP calls; JWKS unknown-kid refresh exactly once; parallel all-ok; one failure ⇒ others aborted and outcome fail-closed.\nHistory: none\n\n### Outside Voice\nCodex reviews disabled (`codex_reviews=disabled`); outside_status: disabled, logged. No native fallback dispatched (disabled is an opt-out, not a failure). Cross-model tension: none.\n\n### TODO decisions\n- **D12** — TODO \"Migrate legacyAuthFlow() callers to AuthBroker and delete the legacy path\": **A — Add to TODOS.md**. TODOS.md does not exist in the repo; plan mode blocks repo writes, so its creation is Implementation Task T0 (content below). Bookkeeping only; approves no code change.\n\nApproval readiness: PASS\nChecked: D4 (S4, defer legacy rewrite), D5 (S1-S3, 2-class structure), R1←D6 (A, injection), R2←D7 (A, single writer + re-check), R3←D8 (A, per-tenant flag), R4←D9 (A, split + typed outcomes), R5←D10 (A, full characterization, regression contract), R6←D11 (A, cache-first + parallel with abort), D12 (A, TODO). Carried proofs (A4 fail-closed; R2/R3/R4/R6 tests) are necessary implementation of approved contracts. No deferrals open inside this review.\n\n## NOT in scope\n- **`legacyAuthFlow()` rewrite** — deferred (D4); strangler migration via the R3 flag is the follow-up (T0 TODO). Rationale: keep auth rollback to a config flip.\n- **`AuthCache` facade, `TokenStore`, `RequestPolicy` classes** — cut (D5); the existing adapter already owns tenant keying/invalidation; promote a class only when code shows a distinct contract.\n- **Adapter check-and-set / write serialization** — not chosen (D7-B rejected in favor of A); revisit only if the post-write re-check proves insufficient in the interleaving test.\n- **Changing the existing adapter, its hooks or its tests** — plan contract retained unchanged (`PLAN.md:12-13`).\n- **Removing duplicated validation between legacy and AuthBroker (C4)** — consequence of D4; removed by the T0 migration.\n- **Distribution/CI artifacts** — none introduced; N/A.\n\n## What already exists\n| Existing | Plan reuses? | Note |\n|---|---|---|\n| Cache adapter: tenant/issuer/audience/policy-version keying, expiry eviction, logout/revoke/suspend invalidation (`PLAN.md:7-9`) | **Yes** (D5, D6: injected, used directly) | Original plan wrapped it twice (AuthCache facade + TokenStore); cut. |\n| Adapter invalidation hooks + tests (`PLAN.md:12-13`) | **Yes**, unchanged | R2's post-write re-check calls the same hooks; no new invalidation path. |\n| `legacyAuthFlow()` (`PLAN.md:27`) | **Yes**, untouched (D4) | Serves all flag-off tenants; protected by the R5 characterization suite. |\n| `validateAndDispatch()` (`PLAN.md:23`) | Restructured (R4) | Existing behavior preserved; error visibility added. |\n| IDP client (5 calls, `PLAN.md:31`) | Reused, reclassified (R6) | Metadata/JWKS behind TTL cache; per-token calls parallel with abort. |\n\n## Diagrams\nPlan-level data flow (also in Section 1 of the review):\n\n```\n request (tenant, token)\n        │\n        ▼\n ┌─ routing: tenant on flag allowlist? ─┐\n │ no / flag missing        yes         │\n ▼                          ▼           │\n legacyAuthFlow()      AuthBroker.validate()\n (unchanged, D4)            │  1. adapter hit? ──▶ ok (0 IDP calls)\n        │                   │  2. metadata/JWKS from TTL cache\n        │                   │  3. per-token calls: Promise.all + AbortSignal\n        │                   │  → ValidationOutcome: ok | invalid | unavailable\n        │                   ▼\n        │             AuthBroker.dispatch(outcome)\n        │                   │ ok → SessionMint.mint()\n        │                   │        write ──▶ adapter ──▶ re-check hooks → self-invalidate if fired\n        │                   │ non-ok → typed error, logged once (fail closed)\n        ▼                   ▼\n ┌──────────────── existing cache adapter (one instance, injected) ───────────────┐\n │ keyed tenant/issuer/aud/policy · expiry eviction · logout/revoke/suspend hooks │\n └────────────────────────────────────────────────────────────────────────────────┘\n```\n\nInline ASCII comments to add in implementation: `AuthBroker` (validate → dispatch pipeline with the three outcomes), `SessionMint` (write → re-check → self-invalidate), the composition root (who receives the one adapter instance), the routing module (four flag cases).\n\n## Failure modes\n| Codepath | Realistic failure | Test | Handling | User sees | Gap? |\n|---|---|---|---|---|---|\n| Routing flag read | flag store unreachable | R3 test (missing/unreadable → legacy) | fallback to legacy | normal legacy login | no |\n| AuthBroker.validate, IDP | timeout / 5xx mid fan-out | R6 test (one failure → abort, fail closed) | typed `unavailable` | clear \"try again\" error | no |\n| AuthBroker.validate | malformed / expired / wrong-aud token | R4 tests per class | typed `invalid` | clear auth error | no |\n| SessionMint.mint | suspend hook fires during await | R2 interleaving test | post-write re-check + self-invalidate | no session (correct) | no |\n| SessionMint.mint | adapter write throws | **not yet listed** | R4 error map must include storage errors → `unavailable` | clear error | **add to R4 error map (P2, included in T4)** |\n| JWKS cache | key rotated, unknown `kid` | R6 test (refresh once) | single refresh, then fail closed | brief error only if rotation window missed | no |\n| legacyAuthFlow | new writer changes shared entry shape | R5 characterization | adapter unchanged | unchanged | no |\n| Composition root | two adapter instances built by mistake | R1 same-instance test | type/DI wiring | invisible cache split | no |\n\nCritical gaps (no test AND no handling AND silent): **0**. One P2 handling addition folded into T4 (storage error in the R4 map).\n\n## Worktree parallelization strategy\n| Step | Modules touched | Depends on |\n|---|---|---|\n| S-A Composition root + adapter injection (R1) | auth/bootstrap, auth/services | — |\n| S-B Routing flag (R3) | auth/routing, config | — |\n| S-C validate()/dispatch() restructure (R4) | auth/services (AuthBroker) | S-A |\n| S-D SessionMint single writer + re-check (R2) | auth/services (SessionMint) | S-A |\n| S-E IDP call classification + TTL cache + parallel/abort (R6) | auth/idp-client | — |\n| S-F legacyAuthFlow characterization suite (R5) | auth/legacy tests | — (capture baseline BEFORE S-A..S-E land) |\n\nLanes:\n- Lane A: S-A → S-C → S-D (sequential, shared auth/services)\n- Lane B: S-B (independent)\n- Lane C: S-E (independent)\n- Lane D: S-F (independent; run first to capture baseline outcomes)\n\nExecution order: launch D first (baseline capture), then A + B + C in parallel worktrees. Merge B, C, D; then A. Conflict flags: Lane A and Lane C both touch AuthBroker's IDP call site at S-C/S-E boundary; define the `IdpClient` interface in S-E first, consume in S-C.\n\n## TODOS.md (T0 — create after plan mode exits)\n```markdown\n# TODOS\n\n## Auth\n\n### Migrate legacyAuthFlow() callers to AuthBroker and delete the legacy path\n\n**What:** Move every tenant onto AuthBroker via the per-tenant flag, then remove legacyAuthFlow() and its characterization suite.\n\n**Why:** Ends the dual auth path created by the strangler deferral (plan-eng-review D4, 2026-09-16) and the duplicated token validation between the two paths.\n\n**Context:** The multi-tenant auth refactor landed AuthBroker/SessionMint beside legacyAuthFlow(), routed by a per-tenant allowlist flag (default legacy). Start by enabling internal tenants, watch AuthBroker error rates and IDP call volume, widen in batches, then delete the legacy function, its routing branch and `legacyAuthFlow.characterization.test.*`. The R5 characterization suite is the parity oracle during migration.\n\n**Effort:** M\n**Priority:** P2\n**Depends on:** Multi-tenant auth refactor shipped; flag proven on at least one tenant.\n```\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific\nfinding above. Run with Claude Code or Codex; checkbox as you ship.\n\n- [ ] **T0 (P2, human: ~15min / CC: ~1min)** — repo docs — Create TODOS.md with the legacy-migration TODO above; append gstack skill routing rules to CLAUDE.md (D1) and commit\n  - Surfaced by: Final planning decisions — D12; preamble D1\n  - Files: `TODOS.md`, `CLAUDE.md`\n  - Verify: files present, `git log -1` shows the chore commit\n- [ ] **T1 (P1, human: ~1.5 days / CC: ~20min)** — legacy tests — Capture baseline outcomes and write the `legacyAuthFlow()` characterization suite (login success, each failure class, logout/revoke/suspend invalidation, tenant isolation, each with interleaved SessionMint writes; flag-off routing lands on legacy). **CRITICAL regression.** Land before any other task.\n  - Surfaced by: Test review — T1 / R5 (D10-A)\n  - Files: `auth/legacy/legacyAuthFlow.characterization.test.*`, fake adapter + hook trigger helpers\n  - Verify: suite green against current code before S-A..S-E; still green after\n- [ ] **T2 (P1, human: ~2h / CC: ~5min)** — auth/bootstrap — Remove the module-level AuthCache export; construct the adapter once in a composition root and inject it into AuthBroker and SessionMint constructors\n  - Surfaced by: Architecture — A1 / R1 (D6-A); Scope — S1-S3 / D5-A (AuthCache, TokenStore, RequestPolicy classes cut)\n  - Files: `auth/bootstrap/*`, `auth/services/AuthBroker.*`, `auth/services/SessionMint.*`\n  - Verify: test asserting both services receive the same instance; unit tests run with a fake adapter and no global reset\n- [ ] **T3 (P1, human: ~4h / CC: ~10min)** — auth/services — Make SessionMint the only adapter writer (AuthBroker gets a read-only interface type); after each mint write re-check revoke/suspend state and self-invalidate if a hook fired\n  - Surfaced by: Architecture — A2 / R2 (D7-A)\n  - Files: `auth/services/SessionMint.*`, `auth/services/AuthBroker.*`, `auth/adapter/ReadOnlyAdapter` type\n  - Verify: deterministic interleaving test (suspend hook between read and write → entry absent); compile-time test that AuthBroker cannot call write\n- [ ] **T4 (P1, human: ~half day / CC: ~10min)** — auth/services — Split `validateAndDispatch()` into `validate()` returning `ok | invalid | unavailable` and `dispatch(outcome)`; one error-mapping table (include adapter storage errors → `unavailable`); log each non-ok once with tenant/subject; update callers\n  - Surfaced by: Code quality — C1-C3 / R4 (D9-A); Failure modes (storage error row)\n  - Files: `auth/services/AuthBroker.*`, callers of `validateAndDispatch()`\n  - Verify: unit tests: success + each of three (plus storage) failure classes → exactly one outcome, one log line; dispatch tests per outcome\n- [ ] **T5 (P1, human: ~1 day / CC: ~15min)** — auth/routing — Per-tenant allowlist flag at the auth entry point; default and missing/unreadable → legacyAuthFlow(); flag flip is the kill switch\n  - Surfaced by: Architecture — A3 / R3 (D8-A)\n  - Files: `auth/routing/*`, config schema\n  - Verify: four routing tests (on, off, missing/unreadable, tenant absent)\n- [ ] **T6 (P2, human: ~1 day / CC: ~15min)** — auth/idp-client — Cache-first validation via the adapter; classify the 5 IDP calls; TTL cache for discovery/JWKS with single refresh on unknown `kid`; remaining calls via `Promise.all` sharing one `AbortSignal`, first rejection aborts the rest and fails closed\n  - Surfaced by: Performance — P1-P3 / R6 (D11-A); Architecture — A4\n  - Files: `auth/idp-client/*`, `auth/services/AuthBroker.*`\n  - Verify: cache hit ⇒ zero IDP calls; unknown-kid refresh exactly once; all-ok parallel; one failure ⇒ others aborted, outcome fail-closed\n- [ ] **T7 (P3, human: ~30min / CC: ~3min)** — docs — Add inline ASCII pipeline comments to AuthBroker, SessionMint, composition root and routing module; keep them in the same commit as the code\n  - Surfaced by: Architecture — A5; Code quality — C5\n  - Files: the four modules above\n  - Verify: diagrams match the plan diagram in this report\n\n_No new tasks from Outside Voice (disabled)._\n\nEffort assumption: tests ~50x, bug-fix-with-regression ~20x, architecture ~5x human÷CC; T1 dominated by test writing, T2/T3 by architecture.\n\n## Unresolved decisions that may bite you later\nNone in this review. Recorded unknowns (not decisions): which of the 5 IDP calls are cacheable (resolve while implementing T6); whether the interleaving race in A2 exists in the real adapter (T3's test settles it either way).\n\n## Completion summary\n- Step 0: Scope Challenge — scope reduced per recommendation (D4 defer legacy rewrite; D5 two classes instead of five)\n- Architecture Review: 5 issues found (A1-A5; 3 decisions, 2 factual)\n- Code Quality Review: 5 issues found (C1-C5; 1 decision, 2 factual)\n- Test Review: diagram produced, 31 gaps identified (3 CRITICAL regression, all converted to required work)\n- Performance Review: 4 issues found (P1-P4; 1 decision)\n- NOT in scope: written\n- What already exists: written\n- TODOS.md updates: 1 item proposed to user (accepted; creation deferred to T0 by plan mode)\n- Failure modes: 0 critical gaps flagged (1 P2 handling addition folded into T4)\n- Unresolved decisions: 0 in this review\n- Outside voice: provider codex, disabled (codex_reviews=disabled); no native fallback by design\n- Parallelization: 4 lanes, 3 parallel / 1 sequential (Lane D first for baseline capture)\n- Lake Score: 4/5 (coverage choices answered: D7=9/10, D8=10, D9=10, D10=10, D11=10 → 4 of 5 chose 10/10; D4, D5, D6, D12 differ in kind and are excluded)\n\n## Suppressed findings\n- P4 [P3] (5/10) shared single adapter instance means one eviction policy for both services; informational, no action.\n- S3 [P2] (6/10) RequestPolicy has no stated contract; shown in main report with caveat, resolved by D5-A (folded into AuthBroker).\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | — | — |\n| Outside Review | codex via `/plan-eng-review` | Independent 2nd opinion | 1 | DISABLED (2026-09-16, host claude, provider codex, phase plan-review) | skipped: codex_reviews=disabled |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | CLEAR (PLAN, 2026-09-16, commit 8fe8db6, mode SCOPE_REDUCED) | 45 issues, 0 critical gaps |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | — | — |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | — | — |\n\n- **OUTSIDE COVERAGE:** provider codex, phase plan-review, disabled (user opt-out `codex_reviews=disabled`), no findings, no native fallback dispatched. Outside coverage is absent, not clean.\n- **VERDICT:** ENG CLEARED — ready to implement (scope reduced per D4/D5; all 9 remedies approved with regression contract R5).\n\nNO UNRESOLVED DECISIONS\n",
      "planSha256": "4cc9c0b39bff56a7fdf9a37169b8a0b6685db35f73a290a86615206089c0c604"
    },
    "retry": {
      "source": "cf74db538a2f4c4361f2573316abb91e01663564",
      "transcript": {
        "status": "ready",
        "calls": [
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            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01A9fuDKER9Ay5T9YFRqVPLq",
            "questions": [
              {
                "header": "Routing",
                "question": "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo; one-time gstack setup before the review starts.\nELI10: gstack has a bunch of skills (/investigate, /ship, /plan-eng-review...). A short routing section in CLAUDE.md tells Claude which one to reach for when you say things like \"this is broken\" or \"ship it\", so you don't have to remember the names. Without it, you invoke skills by hand.\nStakes if we pick wrong: none of this is irreversible; skipping just means more manual skill invocation, adding means a ~15-line append to CLAUDE.md (deferred until we leave plan mode, since plan mode forbids edits and commits).\nRecommendation: A because auto-routing is the whole point of installing gstack and the cost is one small committed section.\nNote: options differ in kind, not coverage — no completeness score.\nNet: convenience of automatic skill routing vs keeping CLAUDE.md untouched.",
                "options": [
                  {
                    "label": "Add routing rules (recommended)",
                    "description": "✅ Skills fire automatically from natural requests (bugs → /investigate, deploy → /ship). ✅ One small committed section; teammates get the same routing. ❌ Touches and commits CLAUDE.md (done after plan mode exits, not now)."
                  },
                  {
                    "label": "No thanks, manual invocation",
                    "description": "✅ CLAUDE.md stays exactly as it is; nothing committed on your behalf. ✅ You keep full control over when a skill runs. ❌ You must remember and type skill names yourself every time."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo; one-time gstack setup before the review starts.\nELI10: gstack has a bunch of skills (/investigate, /ship, /plan-eng-review...). A short routing section in CLAUDE.md tells Claude which one to reach for when you say things like \"this is broken\" or \"ship it\", so you don't have to remember the names. Without it, you invoke skills by hand.\nStakes if we pick wrong: none of this is irreversible; skipping just means more manual skill invocation, adding means a ~15-line append to CLAUDE.md (deferred until we leave plan mode, since plan mode forbids edits and commits).\nRecommendation: A because auto-routing is the whole point of installing gstack and the cost is one small committed section.\nNote: options differ in kind, not coverage — no completeness score.\nNet: convenience of automatic skill routing vs keeping CLAUDE.md untouched.": "Add routing rules (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:27:18.300Z"
          },
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            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01RWSqbBaBhx3b6FgkBUHytf",
            "questions": [
              {
                "header": "Prereq",
                "question": "D2 — Run /office-hours first, or go straight into the engineering review?\nProject/branch/task: main branch; reviewing PLAN.md \"Multi-tenant Auth Refactor\" with no design doc on file.\nELI10: No design doc found for this branch. /office-hours produces a structured problem statement, premise challenge, and explored alternatives; it gives this review much sharper input to work with (about 10 minutes). The design doc is per-feature, not per-product: it captures the thinking behind this specific auth refactor, like why two services need a shared cache at all.\nStakes if we pick wrong: skipping means the review judges the plan's mechanics without a stated problem or rejected alternatives; running it costs ~10 minutes before any findings land.\nRecommendation: B because the user asked for a thorough review of this plan as written, the plan already lists concrete architecture/test/perf concerns to work, and the review can flag the missing problem statement as a finding.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper upstream framing vs getting to findings now on a plan that is already concrete enough to review.",
                "options": [
                  {
                    "label": "Skip, standard review (recommended)",
                    "description": "✅ Findings start immediately on the plan the user asked to have reviewed. ✅ Missing problem statement and alternatives get flagged inside the review itself. ❌ Review has no written 'why' to check the architecture against; some judgments rest on inference."
                  },
                  {
                    "label": "Run /office-hours now",
                    "description": "✅ Produces a problem statement and premise challenge before architecture is locked. ✅ Explored alternatives give the review a baseline to compare the 4-class design against. ❌ Adds ~10 minutes of interactive questions before the first finding (human: ~1 hr / CC: ~10 min)."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D2 — Run /office-hours first, or go straight into the engineering review?\nProject/branch/task: main branch; reviewing PLAN.md \"Multi-tenant Auth Refactor\" with no design doc on file.\nELI10: No design doc found for this branch. /office-hours produces a structured problem statement, premise challenge, and explored alternatives; it gives this review much sharper input to work with (about 10 minutes). The design doc is per-feature, not per-product: it captures the thinking behind this specific auth refactor, like why two services need a shared cache at all.\nStakes if we pick wrong: skipping means the review judges the plan's mechanics without a stated problem or rejected alternatives; running it costs ~10 minutes before any findings land.\nRecommendation: B because the user asked for a thorough review of this plan as written, the plan already lists concrete architecture/test/perf concerns to work, and the review can flag the missing problem statement as a finding.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper upstream framing vs getting to findings now on a plan that is already concrete enough to review.": "Skip, standard review (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:28:00.472Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01MDhdximSgATMpdGPo9mZ6U",
            "questions": [
              {
                "header": "Learnings",
                "question": "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch; one-time gstack setup before the Scope Challenge on PLAN.md.\nELI10: gstack keeps a local notebook of lessons from past sessions (pitfalls, patterns, project quirks). It can read notebooks from your other projects on this machine to find patterns that might apply here. This stays local (no data leaves your machine). Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: enabling on a multi-client machine could surface one client's patterns while working on another; disabling just means fewer prior-learning hits until you flip it back.\nRecommendation: A because this fixture has no learnings of its own yet (LEARNINGS: 0), so cross-project is the only way prior lessons reach this review, and the setting is a one-line toggle.\nNote: options differ in kind, not coverage — no completeness score.\nNet: more prior-learning recall vs strict per-project isolation.",
                "options": [
                  {
                    "label": "Enable cross-project (recommended)",
                    "description": "✅ Past pitfalls from any project on this machine can surface as 'Prior learning applied' in reviews. ✅ Purely local search; reversible with gstack-config set cross_project_learnings false. ❌ On a shared multi-client machine, one codebase's patterns can leak into another's review."
                  },
                  {
                    "label": "Project-scoped only",
                    "description": "✅ Strict isolation; nothing from other codebases influences this review. ✅ Safe default for consultants juggling client repos. ❌ This project has zero learnings today, so the Prior Learnings step finds nothing."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch; one-time gstack setup before the Scope Challenge on PLAN.md.\nELI10: gstack keeps a local notebook of lessons from past sessions (pitfalls, patterns, project quirks). It can read notebooks from your other projects on this machine to find patterns that might apply here. This stays local (no data leaves your machine). Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: enabling on a multi-client machine could surface one client's patterns while working on another; disabling just means fewer prior-learning hits until you flip it back.\nRecommendation: A because this fixture has no learnings of its own yet (LEARNINGS: 0), so cross-project is the only way prior lessons reach this review, and the setting is a one-line toggle.\nNote: options differ in kind, not coverage — no completeness score.\nNet: more prior-learning recall vs strict per-project isolation.": "Enable cross-project (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:29:08.818Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01SWGy7L6rVbJVwb4XzkB81i",
            "questions": [
              {
                "header": "Scope cut",
                "question": "D4 — Does TokenStore stay in this refactor, or is it cut/deferred?\nProject/branch/task: main; Scope Challenge complexity gate on PLAN.md \"Multi-tenant Auth Refactor\" (12 files, 4 new classes + AuthBroker).\nELI10: The plan already says the existing cache adapter stores tokens keyed by tenant, issuer, audience and policy version, evicts expired ones, and invalidates on logout/revocation/suspension (PLAN.md:7-13). Then it adds a brand-new class called TokenStore (PLAN.md:35) without saying what it stores that the adapter does not. Two places that hold tokens means two places that can disagree about whether a token is still valid. That is the exact bug class a multi-tenant auth system cannot afford.\nStakes if we pick wrong: keep it with no defined role and you ship a second token source of truth; cut it and it turns out to hold something the adapter cannot (say, refresh tokens with a different lifetime) and SessionMint has nowhere to put them.\nRecommendation: B (defer) because nothing in the plan names a TokenStore responsibility the retained adapter lacks; if a real one surfaces during implementation it comes back as its own scoped decision with a stated contract.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one token source of truth vs keeping a slot open for a responsibility the plan has not written down.",
                "options": [
                  {
                    "label": "Defer TokenStore (recommended)",
                    "description": "✅ One token source of truth: the retained adapter behind the AuthCache facade. ✅ Drops one of the 4 new classes and its file(s) from a 12-file diff. ❌ If refresh tokens or non-cache token state truly need a home, that comes back as a follow-up decision (human: ~1 day / CC: ~20 min later)."
                  },
                  {
                    "label": "Keep TokenStore",
                    "description": "✅ Keeps the plan's original shape; no re-planning of SessionMint's storage. ✅ Room for token state the cache adapter does not model, if that exists. ❌ Second token holder with undefined contract next to an adapter that already keys, evicts and invalidates tokens; drift and stale-token bugs live in that gap."
                  },
                  {
                    "label": "Cut TokenStore entirely",
                    "description": "✅ Cleanest scope: the name disappears from the plan and cannot creep back silently. ✅ Same simplification win as deferring. ❌ If a real need appears mid-implementation you re-open scope instead of picking up a recorded deferral."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D4 — Does TokenStore stay in this refactor, or is it cut/deferred?\nProject/branch/task: main; Scope Challenge complexity gate on PLAN.md \"Multi-tenant Auth Refactor\" (12 files, 4 new classes + AuthBroker).\nELI10: The plan already says the existing cache adapter stores tokens keyed by tenant, issuer, audience and policy version, evicts expired ones, and invalidates on logout/revocation/suspension (PLAN.md:7-13). Then it adds a brand-new class called TokenStore (PLAN.md:35) without saying what it stores that the adapter does not. Two places that hold tokens means two places that can disagree about whether a token is still valid. That is the exact bug class a multi-tenant auth system cannot afford.\nStakes if we pick wrong: keep it with no defined role and you ship a second token source of truth; cut it and it turns out to hold something the adapter cannot (say, refresh tokens with a different lifetime) and SessionMint has nowhere to put them.\nRecommendation: B (defer) because nothing in the plan names a TokenStore responsibility the retained adapter lacks; if a real one surfaces during implementation it comes back as its own scoped decision with a stated contract.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one token source of truth vs keeping a slot open for a responsibility the plan has not written down.": "Defer TokenStore (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:30:25.299Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01Ji6TTgwAjviCpRyzUAEA6z",
            "questions": [
              {
                "header": "Scope cut",
                "question": "D5 — Does RequestPolicy stay as its own class, fold into AuthBroker, or get deferred?\nProject/branch/task: main; Scope Challenge complexity gate on PLAN.md, second of the two undefined new classes (TokenStore already deferred in D4).\nELI10: RequestPolicy appears once in the plan (PLAN.md:35) with no description of what a 'policy' decides, who calls it, or what it reads. The retained cache adapter already keys entries by a policy version (PLAN.md:7-8), so some policy concept exists today. A new class with no written contract is the most common way a 12-file refactor becomes 18 files: everyone guesses what it should do and it grows to fit.\nStakes if we pick wrong: keep it undefined and it becomes a dumping ground for per-request auth rules with no tests targeting a contract; fold or defer it and, if the broker genuinely needs a pluggable decision point per tenant, you add it back as a small extraction later.\nRecommendation: B (fold into AuthBroker) because request-level auth decisions are exactly what a broker does; extract a class only when a second caller or a second policy implementation exists (make change easy first, then change).\nNote: options differ in kind, not coverage — no completeness score.\nNet: a smaller, explicit broker now vs a speculative abstraction whose contract nobody has written.",
                "options": [
                  {
                    "label": "Keep RequestPolicy as a class",
                    "description": "✅ Policy decisions get a named home with their own unit tests. ✅ Matches the plan as written; no re-planning. ❌ No stated contract or caller; premature abstraction with 1 implementation, and one more file in an already wide diff (human: ~1 day / CC: ~20 min)."
                  },
                  {
                    "label": "Fold into AuthBroker (recommended)",
                    "description": "✅ Policy logic lives next to the only code that uses it; explicit over clever. ✅ Removes a second undefined class; AuthBroker's tests cover the rules directly. ❌ If two policy variants arrive later, you extract then (cheap: a method-to-class move, human: ~2h / CC: ~10 min)."
                  },
                  {
                    "label": "Defer RequestPolicy",
                    "description": "✅ Nothing policy-shaped ships until someone writes down what it decides. ✅ Same file-count win as folding. ❌ Per-request policy checks still have to live somewhere for the broker to work; deferring the name does not defer the behavior."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D5 — Does RequestPolicy stay as its own class, fold into AuthBroker, or get deferred?\nProject/branch/task: main; Scope Challenge complexity gate on PLAN.md, second of the two undefined new classes (TokenStore already deferred in D4).\nELI10: RequestPolicy appears once in the plan (PLAN.md:35) with no description of what a 'policy' decides, who calls it, or what it reads. The retained cache adapter already keys entries by a policy version (PLAN.md:7-8), so some policy concept exists today. A new class with no written contract is the most common way a 12-file refactor becomes 18 files: everyone guesses what it should do and it grows to fit.\nStakes if we pick wrong: keep it undefined and it becomes a dumping ground for per-request auth rules with no tests targeting a contract; fold or defer it and, if the broker genuinely needs a pluggable decision point per tenant, you add it back as a small extraction later.\nRecommendation: B (fold into AuthBroker) because request-level auth decisions are exactly what a broker does; extract a class only when a second caller or a second policy implementation exists (make change easy first, then change).\nNote: options differ in kind, not coverage — no completeness score.\nNet: a smaller, explicit broker now vs a speculative abstraction whose contract nobody has written.": "Keep RequestPolicy as a class"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:30:43.424Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01MeFnELpenLJp1CQAaUHNrz",
            "questions": [
              {
                "header": "Structure",
                "question": "D6 — Which class arrangement for the remaining scope: AuthBroker + SessionMint + RequestPolicy + AuthCache facade, or drop the facade?\nProject/branch/task: main; Scope Challenge structure gate on PLAN.md with TokenStore deferred (D4) and RequestPolicy kept (D5).\nELI10: After D4/D5 the plan adds four new types: two services (AuthBroker, SessionMint), RequestPolicy, and AuthCache. AuthCache is described as a facade over the existing cache adapter that 'retains unchanged validity and tenant-key rules' (PLAN.md:9-13), so it adds no behavior of its own; it is a thin wrapper that gives the two services one narrow cache API. The alternative is to have both services call the existing adapter directly and skip the wrapper. This question is about shape only. How the services obtain the cache (the shared mutable global in PLAN.md:19-20) is a separate architecture decision that stays pending in both options.\nStakes if we pick wrong: keep a pass-through layer nobody needed and every cache change touches two files forever; drop it and the two services each grow their own adapter glue, which is the DRY violation you asked me to flag aggressively.\nRecommendation: A because two consumers of the same adapter is exactly when a shared facade pays for itself, and the facade is the natural seam for whatever we decide about the shared-instance problem in Section 1.\nNote: options differ in kind, not coverage — no completeness score.\nNet: one thin extra file that centralizes cache access for two services vs one fewer type at the cost of duplicated adapter glue.",
                "options": [
                  {
                    "label": "Keep AuthCache facade (recommended)",
                    "description": "✅ AuthBroker and SessionMint share one narrow cache API; adapter details live in one place. ✅ Gives Section 1 a clean seam for fixing the shared mutable instance without touching the adapter. ❌ One more type in a diff already carrying 3 new ones; a pure pass-through until it earns behavior (human: ~half day / CC: ~10 min)."
                  },
                  {
                    "label": "Drop the facade, use adapter directly",
                    "description": "✅ Three new types instead of four; the adapter's existing tests are the only cache tests needed. ✅ No pass-through layer to keep in sync with the adapter. ❌ Two services each carry their own adapter calls and key construction; a cache contract change means editing both."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D6 — Which class arrangement for the remaining scope: AuthBroker + SessionMint + RequestPolicy + AuthCache facade, or drop the facade?\nProject/branch/task: main; Scope Challenge structure gate on PLAN.md with TokenStore deferred (D4) and RequestPolicy kept (D5).\nELI10: After D4/D5 the plan adds four new types: two services (AuthBroker, SessionMint), RequestPolicy, and AuthCache. AuthCache is described as a facade over the existing cache adapter that 'retains unchanged validity and tenant-key rules' (PLAN.md:9-13), so it adds no behavior of its own; it is a thin wrapper that gives the two services one narrow cache API. The alternative is to have both services call the existing adapter directly and skip the wrapper. This question is about shape only. How the services obtain the cache (the shared mutable global in PLAN.md:19-20) is a separate architecture decision that stays pending in both options.\nStakes if we pick wrong: keep a pass-through layer nobody needed and every cache change touches two files forever; drop it and the two services each grow their own adapter glue, which is the DRY violation you asked me to flag aggressively.\nRecommendation: A because two consumers of the same adapter is exactly when a shared facade pays for itself, and the facade is the natural seam for whatever we decide about the shared-instance problem in Section 1.\nNote: options differ in kind, not coverage — no completeness score.\nNet: one thin extra file that centralizes cache access for two services vs one fewer type at the cost of duplicated adapter glue.": "Keep AuthCache facade (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:31:13.613Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_0178P16Lnh42prQREwrLhpJV",
            "questions": [
              {
                "header": "Arch R1",
                "question": "D7 — How should AuthBroker and SessionMint get their AuthCache: injected, or the module-level global the plan proposes?\nProject/branch/task: main; Section 1 Architecture on PLAN.md, finding #1 (PLAN.md:19-20: 'share a global mutable AuthCache instance via module-level export. Both services mutate it.').\nELI10: A module-level export is a variable created the moment the file is first imported, and every importer in the process gets that same object forever. Two services writing to it means neither can be tested alone (state leaks between tests), you cannot run two tenants' brokers with different cache configs, and the wiring is invisible: nothing in AuthBroker's signature says it depends on a cache. Constructor injection means the app's startup code builds one AuthCache and hands it to both services. Same single backing cache at runtime, but the dependency is explicit and swappable in tests. [Layer 1] This is the standard fix; the searches above confirm module singletons with mutable state are the named footgun.\nStakes if we pick wrong: with the global, a test that suspends tenant A leaves that state for the next test and you get order-dependent flakes in the auth suite, the one suite you most need to trust; with injection, the cost is a composition-root change and two constructor params.\nRecommendation: A because explicit over clever is your stated preference, the facade (D6) is already the seam, and injection costs minutes with CC while removing a whole class of test flakiness.\nCompleteness: A=10/10, B=3/10, C=6/10\nNet: explicit, testable wiring for two constructor arguments vs zero wiring and shared hidden state.",
                "options": [
                  {
                    "label": "Constructor-inject one AuthCache (recommended)",
                    "description": "✅ Each service declares its cache dependency; tests pass a fresh AuthCache per test, no cross-test leakage. ✅ One instance still built at startup, so runtime keeps a single backing cache exactly as the plan intends. ❌ Composition root (app bootstrap) must construct and pass the instance; two constructor params to add (human: ~half day / CC: ~10 min)."
                  },
                  {
                    "label": "Keep module-level export",
                    "description": "✅ Zero wiring; import and use, matching the plan as written. ✅ Fewest lines changed today. ❌ Hidden shared mutable state across two services; tests share it unless every suite manually clears it, and per-tenant or per-environment cache configs are impossible."
                  },
                  {
                    "label": "Module export + resetForTests() hook",
                    "description": "✅ Keeps import-and-use ergonomics while giving tests a way to clear state. ✅ Small: one exported reset function. ❌ Production code grows a test-only door; dependency still invisible in service signatures and still one instance per process."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D7 — How should AuthBroker and SessionMint get their AuthCache: injected, or the module-level global the plan proposes?\nProject/branch/task: main; Section 1 Architecture on PLAN.md, finding #1 (PLAN.md:19-20: 'share a global mutable AuthCache instance via module-level export. Both services mutate it.').\nELI10: A module-level export is a variable created the moment the file is first imported, and every importer in the process gets that same object forever. Two services writing to it means neither can be tested alone (state leaks between tests), you cannot run two tenants' brokers with different cache configs, and the wiring is invisible: nothing in AuthBroker's signature says it depends on a cache. Constructor injection means the app's startup code builds one AuthCache and hands it to both services. Same single backing cache at runtime, but the dependency is explicit and swappable in tests. [Layer 1] This is the standard fix; the searches above confirm module singletons with mutable state are the named footgun.\nStakes if we pick wrong: with the global, a test that suspends tenant A leaves that state for the next test and you get order-dependent flakes in the auth suite, the one suite you most need to trust; with injection, the cost is a composition-root change and two constructor params.\nRecommendation: A because explicit over clever is your stated preference, the facade (D6) is already the seam, and injection costs minutes with CC while removing a whole class of test flakiness.\nCompleteness: A=10/10, B=3/10, C=6/10\nNet: explicit, testable wiring for two constructor arguments vs zero wiring and shared hidden state.": "Constructor-inject one AuthCache (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:32:45.214Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_016chyVK4h7pXPNadmxKtB3w",
            "questions": [
              {
                "header": "Arch R2",
                "question": "D8 — Should the AuthCache facade guard against a SessionMint write landing after a tenant invalidation?\nProject/branch/task: main; Section 1 Architecture on PLAN.md, finding #2 (PLAN.md:10 'they do not serialize mutations'; PLAN.md:20 'Both services mutate it'; PLAN.md:8-9 invalidation on logout, revocation, tenant suspension). Medium confidence, verify against the adapter's write API.\nELI10: Picture this sequence: SessionMint reads tenant A's policy and starts minting a session; an admin suspends tenant A, which invalidates A's cache entries; then SessionMint's write lands and puts a fresh, valid-looking session for a suspended tenant back into the cache. Nothing serializes those two mutations, so the plan as written allows a suspended tenant to hold a live cached session until it expires. A generation guard is a small counter per tenant that the facade bumps on every invalidation; a write that started before the bump gets dropped instead of resurrecting the entry. The adapter itself stays untouched, the guard lives in the facade you kept in D6.\nStakes if we pick wrong: skip it and a suspended or logged-out tenant can keep a cached session for up to one token TTL, which is a security hole with a legal-sounding name; add it and you carry one counter map plus one unit test.\nRecommendation: A because it is a few dozen lines in the facade, it closes a stale-write window in an auth path, and its test is a single interleaving. I flag medium confidence only because the adapter's real write semantics are not in this repo; if the adapter already versions writes, the guard collapses to a no-op.\nCompleteness: A=10/10, B=3/10, C=n/a (investigation, value stays pending)\nNet: closing a suspended-tenant resurrection window for a counter and a test vs documenting it as an accepted TTL-bounded risk.",
                "options": [
                  {
                    "label": "Facade generation guard (recommended)",
                    "description": "✅ A write that began before an invalidation for that tenant is dropped and logged, so suspension/logout wins the race. ✅ Lives entirely in the AuthCache facade; retained adapter and its tests stay unchanged (human: ~1 day / CC: ~15 min). ❌ One more piece of state (per-tenant generation map) to reason about and keep bounded."
                  },
                  {
                    "label": "Accept and document the window",
                    "description": "✅ Nothing new to build; plan records the window as bounded by token TTL. ✅ Fine if TTLs are short and suspension is rare and non-urgent. ❌ A suspended or logged-out tenant can keep a live cached session for up to one TTL; auditors will ask about this."
                  },
                  {
                    "label": "Investigate adapter ordering first",
                    "description": "✅ If the adapter already rejects stale writes (versioned puts), the guard is unnecessary and we learn that before building. ✅ Bounded: read the adapter's put/invalidate implementation and its tests. ❌ Leaves this decision open until the probe runs; plan cannot claim the window is closed yet."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D8 — Should the AuthCache facade guard against a SessionMint write landing after a tenant invalidation?\nProject/branch/task: main; Section 1 Architecture on PLAN.md, finding #2 (PLAN.md:10 'they do not serialize mutations'; PLAN.md:20 'Both services mutate it'; PLAN.md:8-9 invalidation on logout, revocation, tenant suspension). Medium confidence, verify against the adapter's write API.\nELI10: Picture this sequence: SessionMint reads tenant A's policy and starts minting a session; an admin suspends tenant A, which invalidates A's cache entries; then SessionMint's write lands and puts a fresh, valid-looking session for a suspended tenant back into the cache. Nothing serializes those two mutations, so the plan as written allows a suspended tenant to hold a live cached session until it expires. A generation guard is a small counter per tenant that the facade bumps on every invalidation; a write that started before the bump gets dropped instead of resurrecting the entry. The adapter itself stays untouched, the guard lives in the facade you kept in D6.\nStakes if we pick wrong: skip it and a suspended or logged-out tenant can keep a cached session for up to one token TTL, which is a security hole with a legal-sounding name; add it and you carry one counter map plus one unit test.\nRecommendation: A because it is a few dozen lines in the facade, it closes a stale-write window in an auth path, and its test is a single interleaving. I flag medium confidence only because the adapter's real write semantics are not in this repo; if the adapter already versions writes, the guard collapses to a no-op.\nCompleteness: A=10/10, B=3/10, C=n/a (investigation, value stays pending)\nNet: closing a suspended-tenant resurrection window for a counter and a test vs documenting it as an accepted TTL-bounded risk.": "Facade generation guard (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:33:32.525Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01C3MWgYMB6mTTsWPV79nuN8",
            "questions": [
              {
                "header": "Quality R3",
                "question": "D9 — How should validateAndDispatch() handle errors: typed results with one boundary, keep the nested catches with logging, or leave as is?\nProject/branch/task: main; Section 2 Code Quality on PLAN.md, finding #1 (PLAN.md:23-24: '60 lines with three nested try/catch blocks; each catch swallows a different error class').\nELI10: A catch that swallows an error turns 'the IDP rejected this token' into 'nothing happened', and the caller carries on as if validation passed or quietly skips dispatch. In an auth path that is the difference between a 401 and a silent allow or a silent drop. The clean shape is: split the function into validate() and dispatch(), have each return a small result object like {ok:true} or {ok:false, reason:'expired'}, and put exactly one error boundary at the caller that maps each reason to a response and logs it. Errors nobody named keep propagating instead of vanishing. This is also how the function gets under 60 lines and how each branch becomes unit-testable on its own.\nStakes if we pick wrong: keep swallowing and the first production incident is 'users are logged in but nothing dispatched, no error anywhere in the logs'; refactor and you spend CC-minutes on a function you are already rewriting the surroundings of.\nRecommendation: A because you are already touching this code for the refactor (make the change easy, then make the change), silent catches in auth are the hack you asked me to flag, and every reason branch gets a test.\nCompleteness: A=10/10, B=6/10, C=1/10\nNet: named, tested failure reasons and no silent paths vs keeping the current shape with better logs.",
                "options": [
                  {
                    "label": "Typed result + single boundary (recommended)",
                    "description": "✅ Zero swallowed error classes: each becomes a named reason or propagates; one place maps reason → HTTP/response + log. ✅ validate() and dispatch() each shrink to testable units with one test per reason branch (human: ~1.5 days / CC: ~20 min). ❌ Callers of validateAndDispatch() must handle the result shape; touches every call site in the 10-file diff."
                  },
                  {
                    "label": "Keep nesting, log in each catch",
                    "description": "✅ Smallest diff: three log lines, no signature change for callers. ✅ Incidents at least leave a trace with error class and tenant. ❌ Still 60 lines of nested try/catch; still swallows, so behavior after an error is unchanged and untested; logs are the only signal."
                  },
                  {
                    "label": "Leave as is",
                    "description": "✅ No work, no risk of changing dispatch behavior in this refactor. ✅ Defers to a later cleanup PR. ❌ Ships an auth path where three error classes disappear silently; the plan itself already flagged this as a problem."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D9 — How should validateAndDispatch() handle errors: typed results with one boundary, keep the nested catches with logging, or leave as is?\nProject/branch/task: main; Section 2 Code Quality on PLAN.md, finding #1 (PLAN.md:23-24: '60 lines with three nested try/catch blocks; each catch swallows a different error class').\nELI10: A catch that swallows an error turns 'the IDP rejected this token' into 'nothing happened', and the caller carries on as if validation passed or quietly skips dispatch. In an auth path that is the difference between a 401 and a silent allow or a silent drop. The clean shape is: split the function into validate() and dispatch(), have each return a small result object like {ok:true} or {ok:false, reason:'expired'}, and put exactly one error boundary at the caller that maps each reason to a response and logs it. Errors nobody named keep propagating instead of vanishing. This is also how the function gets under 60 lines and how each branch becomes unit-testable on its own.\nStakes if we pick wrong: keep swallowing and the first production incident is 'users are logged in but nothing dispatched, no error anywhere in the logs'; refactor and you spend CC-minutes on a function you are already rewriting the surroundings of.\nRecommendation: A because you are already touching this code for the refactor (make the change easy, then make the change), silent catches in auth are the hack you asked me to flag, and every reason branch gets a test.\nCompleteness: A=10/10, B=6/10, C=1/10\nNet: named, tested failure reasons and no silent paths vs keeping the current shape with better logs.": "Typed result + single boundary (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:34:29.923Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01QtdsxU9x4WDSnXvKvGYgmR",
            "questions": [
              {
                "header": "Tests R4",
                "question": "D10 — How do we protect legacyAuthFlow()'s current behavior through the rewrite?\nProject/branch/task: main; Section 3 Test review on PLAN.md, REGRESSION RULE (PLAN.md:27-28: 'legacyAuthFlow() will get rewritten... no regression test for the prior behavior is planned'; PLAN.md:14-16 says new coverage will not touch it).\nELI10: You are about to replace the code that currently logs every user in, and the plan says nothing will check that the replacement behaves the same. A characterization test is a test you write BEFORE changing code: feed the old function each kind of input (valid token, expired, wrong audience, wrong tenant, revoked, IDP down) and record exactly what it does. Then run those same tests against the rewrite. Where you intend the behavior to change, you write that difference down and assert the new behavior explicitly, so 'different' is a decision, not an accident. The alternative, a couple of end-to-end login tests against the new code only, proves the new code works on the paths you remembered, not that the old paths still do.\nStakes if we pick wrong: a tenant with an edge-case token shape that the old flow accepted starts getting 401s the morning after deploy, and nobody can say whether that was intended; with characterization tests the diff between old and new is a list you reviewed.\nRecommendation: A because a rewrite is a regression risk by definition, CC makes writing six characterization cases a minutes-long job, and the intentional-difference list doubles as the release note.\nCompleteness: A=10/10, B=5/10, C=10/10 (same tests plus a rollout flag; differs in rollout, not coverage)\nNet: knowing exactly how the rewrite differs from today vs trusting a few happy-path logins.",
                "options": [
                  {
                    "label": "Characterization + explicit differences (recommended)",
                    "description": "✅ Every input class the old flow handles is captured before the rewrite and re-run after; unintended changes fail CI. ✅ Intentional differences are enumerated in the plan with one assertion each (human: ~1.5 days / CC: ~20 min). ❌ Requires reading legacyAuthFlow() and its callers first to enumerate input classes; some legacy quirks may be ugly to encode."
                  },
                  {
                    "label": "Golden E2E login tests only",
                    "description": "✅ Cheapest to write: a few end-to-end logins per tenant type against the rewrite. ✅ Exercises the real integration path. ❌ Proves the new flow works on remembered paths; says nothing about old behavior on expired/revoked/wrong-tenant inputs, which is where auth regressions hide."
                  },
                  {
                    "label": "Strangler flag + characterization",
                    "description": "✅ Old flow stays live behind a feature flag; new flow canaried per tenant; instant rollback. ✅ Same characterization tests as A protect both paths. ❌ Two auth paths in production for a while plus a follow-up PR to delete the legacy one (human: +1 day / CC: +10 min, plus canary calendar time)."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D10 — How do we protect legacyAuthFlow()'s current behavior through the rewrite?\nProject/branch/task: main; Section 3 Test review on PLAN.md, REGRESSION RULE (PLAN.md:27-28: 'legacyAuthFlow() will get rewritten... no regression test for the prior behavior is planned'; PLAN.md:14-16 says new coverage will not touch it).\nELI10: You are about to replace the code that currently logs every user in, and the plan says nothing will check that the replacement behaves the same. A characterization test is a test you write BEFORE changing code: feed the old function each kind of input (valid token, expired, wrong audience, wrong tenant, revoked, IDP down) and record exactly what it does. Then run those same tests against the rewrite. Where you intend the behavior to change, you write that difference down and assert the new behavior explicitly, so 'different' is a decision, not an accident. The alternative, a couple of end-to-end login tests against the new code only, proves the new code works on the paths you remembered, not that the old paths still do.\nStakes if we pick wrong: a tenant with an edge-case token shape that the old flow accepted starts getting 401s the morning after deploy, and nobody can say whether that was intended; with characterization tests the diff between old and new is a list you reviewed.\nRecommendation: A because a rewrite is a regression risk by definition, CC makes writing six characterization cases a minutes-long job, and the intentional-difference list doubles as the release note.\nCompleteness: A=10/10, B=5/10, C=10/10 (same tests plus a rollout flag; differs in rollout, not coverage)\nNet: knowing exactly how the rewrite differs from today vs trusting a few happy-path logins.": "Characterization + explicit differences (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:35:29.406Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01HqArne9DwYNrd8cEycBR1X",
            "questions": [
              {
                "header": "Tests R5",
                "question": "D11 — Add an end-to-end multi-tenant auth suite on top of the planned unit + integration tests?\nProject/branch/task: main; Section 3 Test review on PLAN.md, finding #2 (PLAN.md:14-15 plans unit and integration coverage per component; no flow-level test spans AuthBroker → AuthCache → SessionMint → IDP).\nELI10: Unit tests check each box works; integration tests check two boxes talk; neither proves that a real login for tenant A, followed by an admin suspending A while tenant B keeps working, ends with A locked out and B untouched. That is the whole point of 'multi-tenant', and it only shows up when the full chain runs. The E2E decision matrix in this review marks auth flows as too important to trust unit tests alone. The suite is four scenarios: two tenants isolated in one process; suspend A mid-session; two concurrent mints for the same tenant; IDP timeout surfaces as a clean idp_unavailable rather than a hang.\nStakes if we pick wrong: skip it and the cross-tenant bugs (wrong tenant's cache entry served, suspension not honored) are found by a customer; add it and you maintain four E2E scenarios that need a fake IDP.\nRecommendation: A because these four scenarios are exactly the failures D7 and D8 exist to prevent, and without a flow test those fixes are only proven in isolation.\nCompleteness: A=10/10, B=7/10\nNet: proof that tenant isolation and suspension hold across the real chain vs relying on per-component tests to compose correctly.",
                "options": [
                  {
                    "label": "Add the multi-tenant E2E suite (recommended)",
                    "description": "✅ Tenant isolation, mid-session suspension, concurrent mint and IDP timeout are asserted across the real chain. ✅ Directly exercises the D7 injection wiring and the D8 stale-write guard end to end (human: ~2 days / CC: ~30 min incl. fake IDP). ❌ Needs a fake/stub IDP fixture and a composition-root test harness; slower than unit tests."
                  },
                  {
                    "label": "Unit + integration only",
                    "description": "✅ Plan as written; faster suite, no IDP fixture to build. ✅ Per-component error paths are still fully covered. ❌ Cross-tenant and suspension-ordering bugs are only caught if the component tests happen to compose the same way production does."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D11 — Add an end-to-end multi-tenant auth suite on top of the planned unit + integration tests?\nProject/branch/task: main; Section 3 Test review on PLAN.md, finding #2 (PLAN.md:14-15 plans unit and integration coverage per component; no flow-level test spans AuthBroker → AuthCache → SessionMint → IDP).\nELI10: Unit tests check each box works; integration tests check two boxes talk; neither proves that a real login for tenant A, followed by an admin suspending A while tenant B keeps working, ends with A locked out and B untouched. That is the whole point of 'multi-tenant', and it only shows up when the full chain runs. The E2E decision matrix in this review marks auth flows as too important to trust unit tests alone. The suite is four scenarios: two tenants isolated in one process; suspend A mid-session; two concurrent mints for the same tenant; IDP timeout surfaces as a clean idp_unavailable rather than a hang.\nStakes if we pick wrong: skip it and the cross-tenant bugs (wrong tenant's cache entry served, suspension not honored) are found by a customer; add it and you maintain four E2E scenarios that need a fake IDP.\nRecommendation: A because these four scenarios are exactly the failures D7 and D8 exist to prevent, and without a flow test those fixes are only proven in isolation.\nCompleteness: A=10/10, B=7/10\nNet: proof that tenant isolation and suspension hold across the real chain vs relying on per-component tests to compose correctly.": "Add the multi-tenant E2E suite (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:36:18.825Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01LSiB7MjHS2hxm59XEfnJGH",
            "questions": [
              {
                "header": "Perf R6",
                "question": "D12 — How should the 5 IDP calls in token validation run: Promise.all with timeouts and JWKS caching, bare Promise.all, or stay sequential?\nProject/branch/task: main; Section 4 Performance on PLAN.md, finding #1 (PLAN.md:31-32: '5 sequential API calls to the IDP; they could be parallelized via Promise.all trivially (calls are independent)').\nELI10: Today a login waits for five identity-provider round trips one after another, so login latency is five times the IDP's latency. Promise.all fires all five at once and waits for the slowest, so latency drops to roughly one round trip. But bare Promise.all has two sharp edges: if one call hangs, the login hangs with it (no timeout), and if one call fails, the other four keep running for nothing and the raw error leaks out instead of a named reason. The complete version wraps each call in a timeout, cancels the rest on the first failure, maps the outcome to the D9 reason codes (idp_unavailable etc.), and caches the IDP's discovery/JWKS documents per issuer so most logins skip two of the five calls entirely. [Layer 1] Every OIDC library does this; the search above confirms cache-with-refresh-on-unknown-kid is the standard.\nStakes if we pick wrong: bare Promise.all turns one slow IDP call into a stuck login with no error; sequential keeps 5x latency on every login; the complete version costs a timeout helper, an AbortController, and a small per-issuer cache.\nRecommendation: A because it captures the 5x latency win the plan wants and closes the two failure modes the plan's 'trivially' glosses over, at CC-minutes of extra cost.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: fast logins that fail cleanly under IDP trouble vs fast logins that hang, vs slow logins.",
                "options": [
                  {
                    "label": "Promise.all + timeout + abort + JWKS cache (recommended)",
                    "description": "✅ Login latency drops from 5× to ~1× IDP round trip, and discovery/JWKS cache hits skip network entirely on warm paths. ✅ One slow or failed call yields idp_unavailable within a configurable bound (default 2000 ms/call) and cancels the rest; tests: timeout, single rejection, all-success, cache hit (human: ~1.5 days / CC: ~20 min). ❌ Adds a timeout helper, AbortController plumbing and a per-issuer cache with its own invalidation (refresh on unknown kid, one retry)."
                  },
                  {
                    "label": "Bare Promise.all",
                    "description": "✅ Same latency win with a one-line change, exactly as the plan suggests. ✅ No new helpers or cache to maintain. ❌ A hung IDP call hangs the login indefinitely; the first rejection surfaces as a raw error instead of a D9 reason and the other four calls keep burning."
                  },
                  {
                    "label": "Keep sequential",
                    "description": "✅ No concurrency to reason about; failure order is deterministic. ✅ Zero change to validation code in this refactor. ❌ Every login pays 5× IDP latency; the plan itself calls this out as avoidable."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D12 — How should the 5 IDP calls in token validation run: Promise.all with timeouts and JWKS caching, bare Promise.all, or stay sequential?\nProject/branch/task: main; Section 4 Performance on PLAN.md, finding #1 (PLAN.md:31-32: '5 sequential API calls to the IDP; they could be parallelized via Promise.all trivially (calls are independent)').\nELI10: Today a login waits for five identity-provider round trips one after another, so login latency is five times the IDP's latency. Promise.all fires all five at once and waits for the slowest, so latency drops to roughly one round trip. But bare Promise.all has two sharp edges: if one call hangs, the login hangs with it (no timeout), and if one call fails, the other four keep running for nothing and the raw error leaks out instead of a named reason. The complete version wraps each call in a timeout, cancels the rest on the first failure, maps the outcome to the D9 reason codes (idp_unavailable etc.), and caches the IDP's discovery/JWKS documents per issuer so most logins skip two of the five calls entirely. [Layer 1] Every OIDC library does this; the search above confirms cache-with-refresh-on-unknown-kid is the standard.\nStakes if we pick wrong: bare Promise.all turns one slow IDP call into a stuck login with no error; sequential keeps 5x latency on every login; the complete version costs a timeout helper, an AbortController, and a small per-issuer cache.\nRecommendation: A because it captures the 5x latency win the plan wants and closes the two failure modes the plan's 'trivially' glosses over, at CC-minutes of extra cost.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: fast logins that fail cleanly under IDP trouble vs fast logins that hang, vs slow logins.": "Promise.all + timeout + abort + JWKS cache (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:37:58.234Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_016R8XMqXw7u6ze243C15L61",
            "questions": [
              {
                "header": "TODO",
                "question": "D13 — Capture the deferred TokenStore as a TODOS.md entry?\nProject/branch/task: main; TODOS.md step after Sections 1-4 on PLAN.md; TODOS.md does not exist yet in this repo.\nELI10: In D4 you deferred TokenStore because the plan never said what it would hold that the retained cache adapter does not. A deferral with no written trail turns into 'wait, why did we drop that?' three months from now. The TODO would record: What: decide whether any token state (for example refresh tokens or non-cache session material) needs a home outside the adapter, and if so define TokenStore's contract. Why: the adapter already keys, evicts and invalidates tokens; a second holder without a contract is a stale-token bug factory. Pros: one source of truth today; a recorded trigger for revisiting. Cons: if a real need exists, SessionMint may need a small storage seam later. Context: PLAN.md:35 listed TokenStore with no description; D4 deferred it; AuthCache (D6/D7/D8) is the only cache-facing type. Depends on: the RequestPolicy contract (D5) and the composition root (D7) landing first, so any new store is injected the same way.\nStakes if we pick wrong: skip and the deferral reasoning is lost; add and you own one TODO line plus creating TODOS.md.\nRecommendation: A because the deferral was a real scope call with a real re-entry trigger, and the file is cheap to create.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a recorded re-entry point for TokenStore vs a clean plan with no trail, vs pulling the work back into this PR.",
                "options": [
                  {
                    "label": "Add to TODOS.md (recommended)",
                    "description": "✅ The D4 reasoning and the re-entry trigger survive past this session for whoever picks it up. ✅ Creates TODOS.md (does not exist) with the gstack format; written after plan mode exits. ❌ One more file in the repo to keep honest."
                  },
                  {
                    "label": "Skip, not valuable enough",
                    "description": "✅ Nothing to maintain; the decision ledger in the reviewed plan already records D4. ✅ Keeps the repo free of a TODO file for a single item. ❌ Anyone reading the code later will not find the deferral without opening the review report."
                  },
                  {
                    "label": "Build it now in this PR",
                    "description": "✅ No deferral at all; TokenStore gets a contract and lands with the refactor. ✅ Removes the open question entirely. ❌ Reverses D4 and re-expands scope to 5 new types without a stated responsibility; the same objection from the scope gate applies."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D13 — Capture the deferred TokenStore as a TODOS.md entry?\nProject/branch/task: main; TODOS.md step after Sections 1-4 on PLAN.md; TODOS.md does not exist yet in this repo.\nELI10: In D4 you deferred TokenStore because the plan never said what it would hold that the retained cache adapter does not. A deferral with no written trail turns into 'wait, why did we drop that?' three months from now. The TODO would record: What: decide whether any token state (for example refresh tokens or non-cache session material) needs a home outside the adapter, and if so define TokenStore's contract. Why: the adapter already keys, evicts and invalidates tokens; a second holder without a contract is a stale-token bug factory. Pros: one source of truth today; a recorded trigger for revisiting. Cons: if a real need exists, SessionMint may need a small storage seam later. Context: PLAN.md:35 listed TokenStore with no description; D4 deferred it; AuthCache (D6/D7/D8) is the only cache-facing type. Depends on: the RequestPolicy contract (D5) and the composition root (D7) landing first, so any new store is injected the same way.\nStakes if we pick wrong: skip and the deferral reasoning is lost; add and you own one TODO line plus creating TODOS.md.\nRecommendation: A because the deferral was a real scope call with a real re-entry trigger, and the file is cheap to create.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a recorded re-entry point for TokenStore vs a clean plan with no trail, vs pulling the work back into this PR.": "Add to TODOS.md (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:39:03.853Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01CCH5365kWYvY1ib4RHitzT",
            "questions": [
              {
                "header": "Next step",
                "question": "D14 — Review complete. What next?\nProject/branch/task: main; /plan-eng-review of PLAN.md finished, report saved to gstack-test-plan-eng.md, dashboard NOT CLEARED (2 critical gaps mapped to tasks T5/T6, 0 unresolved decisions).\nELI10: The plan is reviewed, every decision is answered, and the two remaining critical gaps are concrete tasks (adapter-error path in AuthCache.get, missing-policy outcome in RequestPolicy) rather than open questions. No UI is touched, so a design review adds nothing; no product direction changes, so a CEO review is optional at best. The natural next move is to leave plan mode and implement the 10 tasks in the lane order given, then /ship.\nStakes if we pick wrong: none of this is irreversible; picking a review you do not need costs time, skipping one you do need costs a later round-trip.\nRecommendation: A because all applicable reviews are complete and the task list is build-ready.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start building now vs an optional strategy pass first.",
                "options": [
                  {
                    "label": "Ready to implement (recommended)",
                    "description": "✅ Exit plan mode; implement T1-T10 in lane order (A+B parallel, then C+D, then E), then run /ship. ✅ First two edits after exit: append routing rules to CLAUDE.md (D1) and create TODOS.md (D13). ❌ CEO review stays unrun; fine for a backend refactor, revisit if scope grows."
                  },
                  {
                    "label": "Run /plan-ceo-review first",
                    "description": "✅ Adds a scope/strategy pass and a written problem statement the plan currently lacks (T10). ✅ Cheap: ~10 minutes with CC. ❌ Optional for a backend refactor with no product-direction change; delays implementation."
                  }
                ]
              }
            ],
            "answered": true,
            "failed": false,
            "answers": {
              "D14 — Review complete. What next?\nProject/branch/task: main; /plan-eng-review of PLAN.md finished, report saved to gstack-test-plan-eng.md, dashboard NOT CLEARED (2 critical gaps mapped to tasks T5/T6, 0 unresolved decisions).\nELI10: The plan is reviewed, every decision is answered, and the two remaining critical gaps are concrete tasks (adapter-error path in AuthCache.get, missing-policy outcome in RequestPolicy) rather than open questions. No UI is touched, so a design review adds nothing; no product direction changes, so a CEO review is optional at best. The natural next move is to leave plan mode and implement the 10 tasks in the lane order given, then /ship.\nStakes if we pick wrong: none of this is irreversible; picking a review you do not need costs time, skipping one you do need costs a later round-trip.\nRecommendation: A because all applicable reviews are complete and the task list is build-ready.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start building now vs an optional strategy pass first.": "Ready to implement (recommended)"
            },
            "unansweredQuestionIndices": [],
            "answeredAt": "2026-09-16T01:41:48.044Z"
          }
        ],
        "assistantMessages": [
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Scope gate: plan mode — auto-selected B (reviewing `PLAN.md`: \"Plan: Multi-tenant Auth Refactor\").",
            "timestamp": "2026-09-16T01:26:55.445Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Plan loaded. No design doc exists, so the prerequisite offer comes next.",
            "timestamp": "2026-09-16T01:27:50.511Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "No worries — standard review. If you ever want sharper input, try /office-hours first next time. Now reading the review sections in full before Step 0.",
            "timestamp": "2026-09-16T01:28:05.458Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Review methodology loaded. Now: Prior Learnings check, retrospective git log, and the requested report destination.",
            "timestamp": "2026-09-16T01:28:40.035Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "No prior learnings on record (fresh machine). Retrospective: one seed commit, no prior review cycle. Aside is not installed, so the Scope Challenge search check falls back to WebSearch.",
            "timestamp": "2026-09-16T01:29:20.685Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "TokenStore deferred (D4). Next scope candidate: `RequestPolicy`.",
            "timestamp": "2026-09-16T01:30:28.455Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "RequestPolicy stays as its own class (D5), noted and locked; I won't re-argue it. Last gate question: overall class arrangement, structure only.",
            "timestamp": "2026-09-16T01:31:00.004Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "**Step 0: Scope Challenge — scope reduced per recommendation (1 of 3 cuts accepted)**\n\n| # | Sev | Conf | Source | Finding | Disposition |\n|---|---|---|---|---|---|\n| 1 | P2 | 8/10 | PLAN.md:7-13 vs :35 | `TokenStore` duplicates a token holder the retained adapter already is (keys, evicts, invalidates). No stated responsibility. | Deferred (D4) |\n| 2 | P3 | 7/10 | PLAN.md:35 | `RequestPolicy` named once, no contract, caller or inputs written down. | Kept as class (D5); contract + tests now a plan requirement |\n| 3 | P2 | 8/10 | PLAN.md:34-36 | Complexity gate: 12 files / 4 classes + `AuthBroker` = 5 new types. | Structure fixed at 4 types with facade (D6) |\n| 4 | P3 | 9/10 | PLAN.md:19 vs :35 | Plan is internally inconsistent: `AuthBroker` is a \"new service\" but missing from the new-class list. Factual correction, no question. | Corrected in report |\n| 5 | P3 | 7/10 | whole plan | No problem statement: nothing says what breaks today or what \"multi-tenant\" adds. Review proceeds on mechanics (D2 skipped /office-hours). | Recorded; NOT in scope of remedies |\n\nSearch check: **[Layer 1]** inject shared dependencies instead of module-level singletons (Node module cache makes import-time instances a testing and per-request-state hazard; sources: [Singleton pitfalls](https://dev-aditya.medium.com/the-singleton-pattern-in-node-js-power-pitfalls-and-performance-under-load-3d841ea5c226), [Singleton vs DI in Node](https://medium.com/@moali314/singleton-dependency-injection-ioc-and-service-locator-in-node-js-9a9c7a3326b7)). **[Layer 1]** JWKS/discovery results are cached with refresh-on-unknown-kid, bounded to one retry ([connect2id](https://connect2id.com/blog/how-to-validate-an-openid-connect-id-token), [JWKS caching](https://okanyurt.medium.com/solving-the-performance-vs-security-dilemma-in-net-core-apis-with-jwks-caching-be24d8961a18)). TODOS.md: absent. Distribution: no new artifact, N/A. Completeness: the plan takes two shortcuts (no legacy regression test, catches that swallow); both go to Sections 2-3.\n\n**Section 1: Architecture.** First pending choice: how `AuthBroker` and `SessionMint` get their `AuthCache`. Saving the ledger record, then asking.",
            "timestamp": "2026-09-16T01:32:16.879Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Now the coverage diagram and Test Plan Artifact (D10/D11 resolved), then the Performance question.",
            "timestamp": "2026-09-16T01:36:45.740Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Read-back gate: verifying the saved file.",
            "timestamp": "2026-09-16T01:41:13.339Z"
          },
          {
            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "text": "Read-back passes: last `## ` heading is `## GSTACK REVIEW REPORT`, table + VERDICT present, final line is the unbolded sentinel. Logging the review and rendering the dashboard.",
            "timestamp": "2026-09-16T01:41:18.410Z"
          }
        ],
        "planReadyRequests": [
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            "sessionId": "594a8522-7239-4615-a26d-d819aad1794c",
            "toolUseId": "toolu_01TSMjSGoohh1s6CRZBBRKDU",
            "timestamp": "2026-09-16T01:42:33.799Z",
            "failed": false
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      "startedAt": 1789522030257,
      "report": {
        "at": "2026-09-16T01:41:11.262Z",
        "kind": "owned-plan-or-report",
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        "bytes": 38189,
        "mtimeMs": 1789522870140.583,
        "provenance": "Exact observed file bytes; never reconstructed from tool text.",
        "path": "/tmp/gstack-owned-display-8i30e6qg/gstack-paid-shard-ALEAjh/tmp/gstack-e2e-plan-eng-dhfLhd/gstack-test-plan-eng.md"
      },
      "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\nReviewed target: `PLAN.md` (\"Plan: Multi-tenant Auth Refactor\") in the plan-review fixture repo, branch `main`, commit `b68f665`.\nReview: `/plan-eng-review`, 2026-09-16. Original plan text is preserved below; accepted amendments are marked **[ACCEPTED Dn]**. Findings and pending choices live in the Decision ledger.\n\n## Existing contracts retained\nThe existing cache adapter keys entries by tenant ID, issuer, audience,\nand policy version. It evicts expired tokens and invalidates entries on\nlogout, token revocation, or tenant suspension. AuthCache retains these\nunchanged validity and tenant-key rules; they do not serialize mutations.\nAuthCache is a service-facing facade over that same existing adapter,\nwith one backing cache. The adapter, its invalidation hooks, and their\nexisting tests remain in use unchanged.\nUnit and integration coverage is planned for the new components and their\nsuccess/error paths. That coverage does not exercise legacyAuthFlow() or\nassert compatibility with its prior behavior.\n\n## Architecture\nTwo new services (`AuthBroker` and `SessionMint`) share a global mutable\n`AuthCache` instance via module-level export. Both services mutate it.\n\n**[ACCEPTED D7]** Replace the module-level export with constructor injection: the composition root (app bootstrap) constructs exactly one `AuthCache` over the retained adapter and passes it to `new AuthBroker(cache, ...)` and `new SessionMint(cache, ...)`. Runtime still has one backing cache; the dependency is explicit and tests build a fresh `AuthCache` per test over a fake adapter.\n\n```\n                composition root (bootstrap)\n                        |\n          existingAdapter = <retained cache adapter>\n          cache = new AuthCache(existingAdapter)\n                 /                    \\\n   new AuthBroker(cache, idp)    new SessionMint(cache, signer)\n        |  read/validate               |  write minted sessions\n        v                              v\n              AuthCache (facade, one instance)\n                        |\n              existing adapter (tenant, issuer, audience, policyVersion)\n              evicts expired | invalidates on logout / revocation / suspension\n```\n\n**[ACCEPTED D8]** `AuthCache` carries a per-tenant invalidation generation. Reads return the generation they observed; writes carry it; a write older than the current generation is dropped and logged (`auth_cache.stale_write_dropped`). This closes the race where a `SessionMint` write lands after a suspension/logout/revocation invalidation and resurrects a session for that tenant. Adapter unchanged. Verify the adapter's write API first; if it already rejects stale writes, the guard is a passthrough but its test stays.\n\n```\n  SessionMint                 AuthCache (facade)             admin / hook\n  ----------                  ------------------             ------------\n  read(A)  ----------------> gen[A]=3, return {entry, gen:3}\n                                                              invalidate(A)\n                              gen[A]=4, adapter.invalidate(A)\n  write(A, session, gen:3) -> 3 < 4  => DROP + log            (no resurrected session)\n```\n\n## Code quality\nThe `validateAndDispatch()` function is 60 lines with three nested\ntry/catch blocks; each catch swallows a different error class.\n\n**[ACCEPTED D9]** Split into `validate()` and `dispatch()`, each returning a discriminated result; one error boundary at the caller. No catch swallows anything: every error class becomes a named `reason` or propagates.\n\n```\n  request ──> validate(token, tenant)\n               ├─ {ok:true, claims}\n               ├─ {ok:false, reason:'expired' | 'bad_audience' | 'bad_issuer' |\n               │                    'unknown_tenant' | 'revoked' | 'idp_unavailable'}\n               └─ throws (unknown error) ──────────────────────┐\n             ──> dispatch(claims)                              │\n               ├─ {ok:true}                                    │\n               └─ {ok:false, reason:'no_route' | 'policy_denied'} │\n             ──> boundary: reason → status + structured log; unknown → 500 + log + rethrow\n```\n\nDRY requirement (no question needed, follows from D6): cache key construction `(tenantId, issuer, audience, policyVersion)` lives only in `AuthCache`; neither service builds keys.\n\n## Tests\nThe existing `legacyAuthFlow()` will get rewritten as part of this work;\nno regression test for the prior behavior is planned.\n\n**[ACCEPTED D10 — CRITICAL regression contract]** Characterization tests are written against `legacyAuthFlow()` BEFORE the rewrite, one per input class (valid; expired; wrong audience; wrong issuer; unknown tenant; revoked; suspended tenant; IDP unavailable; malformed token), then re-run against the rewrite. Intentional differences are enumerated below with one explicit assertion each. Legacy code is removed in this PR only once the suite is green against the new path.\n\n### Intentional behavior differences (fill in during implementation; empty means \"none intended\")\n- _(none recorded yet — every characterization case must pass unchanged until an entry appears here)_\n\n**[ACCEPTED D11]** End-to-end multi-tenant suite (fake IDP fixture + composition-root harness): (1) tenants A and B in one process are each served only their own cache entries; (2) suspend A mid-session → A's next request is rejected, B unaffected; (3) two concurrent mints for one tenant → one cache entry, no error; (4) IDP timeout → `idp_unavailable` within the bound, no hang.\n\n### Test coverage diagram\nFramework: unknown in this fixture (no `package.json`, no test files, no CLAUDE.md Testing section). Planned paths below are all [GAP] today; the retained adapter's existing tests (PLAN.md:12-13) are the only current coverage and are treated as ★★★ for the adapter contract only.\n\n```\nCODE PATHS                                                  USER FLOWS\n[+] AuthCache (facade)                                      [+] Login (multi-tenant)\n  ├── get(tenant, issuer, aud, policyVer)                     ├── [GAP] [→E2E] Tenant A + B isolated in one process\n  │   ├── [GAP] hit → {entry, gen}                            ├── [GAP] [→E2E] Suspend A mid-session, B unaffected\n  │   ├── [GAP] miss → undefined                              ├── [GAP] [→E2E] Concurrent mint, same tenant\n  │   └── [GAP] expired → evicted, miss (adapter ★★★)         └── [GAP] [→E2E] IDP timeout → idp_unavailable, no hang\n  ├── set(entry, gen)\n  │   ├── [GAP] gen == current → written                    [+] Legacy parity (CRITICAL, D10)\n  │   └── [GAP] gen <  current → dropped + log (D8)           ├── [GAP] valid token          (characterization)\n  ├── invalidate(tenant | token | logout)                     ├── [GAP] expired\n  │   └── [GAP] gen[tenant]++ ; adapter.invalidate            ├── [GAP] wrong audience\n  └── key construction (only place, DRY)                      ├── [GAP] wrong issuer\n      └── [GAP] 4-tuple → adapter key                         ├── [GAP] unknown tenant\n[+] AuthBroker                                                ├── [GAP] revoked\n  ├── validate(token, tenant)                                 ├── [GAP] suspended tenant\n  │   ├── [GAP] ok → claims                                   ├── [GAP] IDP unavailable\n  │   ├── [GAP] expired / bad_audience / bad_issuer           └── [GAP] malformed token\n  │   ├── [GAP] unknown_tenant / revoked\n  │   ├── [GAP] idp_unavailable (timeout, D12 pending)      [+] Error states (user-visible)\n  │   └── [GAP] unknown error → propagates (D9)               ├── [GAP] 401 with reason code, not silent allow\n  ├── 5 IDP calls (D12 pending)                               ├── [GAP] 503 idp_unavailable with retry hint\n  │   ├── [GAP] all succeed                                   └── [GAP] 500 unknown → logged with tenant, rethrown\n  │   ├── [GAP] one times out → abort others\n  │   └── [GAP] JWKS cache hit → no network\n  └── RequestPolicy.decide(claims, request)  (D5, contract TBD)\n      ├── [GAP] allow\n      └── [GAP] policy_denied\n[+] SessionMint\n  ├── mint(claims, gen)\n  │   ├── [GAP] ok → set(entry, gen)\n  │   └── [GAP] stale gen → dropped, returns not_minted\n  └── [GAP] signer failure → propagates\n[+] boundary (caller of validate/dispatch)\n  ├── [GAP] each reason → status + log (one test per reason)\n  └── [GAP] unknown → 500 + log + rethrow\n\nCOVERAGE: 0/38 planned paths tested (0%)  |  Code paths: 0/24  |  User flows: 0/14\nQUALITY: adapter ★★★ (existing, retained)  |  GAPS: 38 (4 E2E, 9 CRITICAL regression)\n```\nLegend: ★★★ behavior + edge + error | ★★ happy path | ★ smoke | [→E2E] integration test | CRITICAL = regression contract (D10)\n\n## Performance\nToken validation issues 5 sequential API calls to the IDP; they could be\nparallelized via Promise.all trivially (calls are independent).\n\n**[ACCEPTED D12]** Run the 5 calls with `Promise.all`, each under a per-call timeout (configurable, default 2000 ms) sharing one `AbortController`; first failure aborts the rest and maps to `idp_unavailable` or the specific reason. Cache discovery + JWKS per issuer with refresh-on-unknown-`kid` (one retry). Login latency: 5 × IDP RTT → max(1 × RTT, timeout); warm path skips the discovery/JWKS calls.\n\n```\n  validate(token)\n    ├─ issuerCache.get(iss) ── hit ──> skip discovery + JWKS fetch\n    │                        └ miss ─> fetch, store (refresh once on unknown kid)\n    └─ Promise.all([c1, c2, c3, c4, c5].map(withTimeout(2000ms, signal)))\n         ├─ all ok  ──> claims\n         ├─ one rejects ──> signal.abort() ──> reason (idp_unavailable | specific)\n         └─ one times out ──> signal.abort() ──> idp_unavailable\n```\n\n## Architecture (scope smell)\nThis touches 12 files and introduces 4 new classes (TokenStore,\nSessionMint, AuthCache, RequestPolicy). Worth flagging the complexity check.\n\n**[ACCEPTED D4/D5/D6 — scope after gate]** New types in this refactor: `AuthBroker` (service), `SessionMint` (service), `RequestPolicy` (class, kept per D5), `AuthCache` (facade over the retained adapter, kept per D6). `TokenStore` is **deferred** (D4): the retained adapter already keys, evicts and invalidates tokens; no TokenStore responsibility the adapter lacks is written down. If one surfaces, it returns as its own scoped decision with a stated contract. Expected file count drops from 12 to roughly 10.\n\n## Decision ledger\n\n### S1: TokenStore scope\nFinding: Scope Challenge #1, P2, confidence 8/10, PLAN.md:7-13 vs PLAN.md:35, reviewer: native (plan-eng-review)\nPlan baseline: original proposal — 4 new classes including TokenStore\nRuntime evidence: no source in this repo; plan text only (\"keys entries by tenant ID, issuer, audience, and policy version. It evicts expired tokens and invalidates entries\" vs new `TokenStore` with no stated role)\nState: approved\nQuestion D4: Defer TokenStore (recommended) / Keep TokenStore / Cut TokenStore entirely\nActual answer: Defer TokenStore (D4)\nAccepted scope: TokenStore removed from this refactor; recorded as deferred (TODO candidate)\nHistory: none\n\n### S2: RequestPolicy scope\nFinding: Scope Challenge #2, P3, confidence 7/10, PLAN.md:35, reviewer: native\nPlan baseline: original proposal — RequestPolicy as its own class\nRuntime evidence: no source in this repo; plan names the class once with no contract\nState: approved\nQuestion D5: Keep RequestPolicy as a class / Fold into AuthBroker (recommended) / Defer RequestPolicy\nActual answer: Keep RequestPolicy as a class (D5)\nAccepted scope: RequestPolicy stays as its own class. Requirement carried into Sections 1-3: its contract (inputs, decision output, caller) must be written into the plan and unit-tested.\nHistory: none\n\n### S3: Class arrangement\nFinding: Scope Challenge #3 (complexity gate), P2, confidence 8/10, PLAN.md:34-36, reviewer: native\nPlan baseline: original arrangement (after S1/S2: AuthBroker, SessionMint, RequestPolicy, AuthCache facade)\nRuntime evidence: none (no source); plan describes AuthCache as a facade that \"retains these unchanged validity and tenant-key rules\"\nState: approved\nQuestion D6: Keep AuthCache facade (recommended) / Drop the facade, use adapter directly\nActual answer: Keep AuthCache facade (D6)\nAccepted scope: structure fixed at 4 new types; how services obtain the AuthCache instance stays pending (Section 1)\nHistory: none\n\n### R1: How AuthBroker and SessionMint obtain the AuthCache instance\nFinding: Architecture #1, P1, confidence 8/10, PLAN.md:19-20 (\"share a global mutable `AuthCache` instance via module-level export. Both services mutate it.\"), reviewer: native\nPlan baseline: original proposal — module-level exported singleton, imported by both services\nRuntime evidence: no source in this repo; unknown whether the existing adapter is itself a module-level instance today\nState: pending\nComparison grid:\n| Choice | Current | A (inject) | B (keep module export) | C (module export + explicit reset) |\n|---|---|---|---|---|\n| R1 how services get AuthCache | module-level export, pending | constructor-injected; one instance built at the composition root and passed to both services | module-level export (unchanged) | module-level export plus `resetForTests()` hook |\n| S3 facade + 4 types | approved (D6) | fixed | fixed | fixed |\n| R2 write-after-invalidate guard | pending | pending | pending | pending |\n| Existing adapter contract | retained (PLAN.md:12-13) | fixed | fixed | fixed |\nQuestion D7: A) Constructor-inject one AuthCache instance (recommended) / B) Keep module-level export / C) Module export + test reset hook\nActual answer: A — Constructor-inject one AuthCache (D7)\nAccepted scope: AuthCache is constructed once at the composition root and passed to `AuthBroker` and `SessionMint` constructors; no module-level `AuthCache` export. Tests construct a fresh AuthCache (over a fake or in-memory adapter) per test. Docs: plan Architecture section amended.\nHistory: none\n\n### R2: Write-after-invalidate guard in the AuthCache facade\nFinding: Architecture #2, P1, confidence 6/10 (medium: depends on adapter internals not in this repo; verify against the adapter's write API), PLAN.md:10 (\"they do not serialize mutations\") + PLAN.md:20 (\"Both services mutate it\") + PLAN.md:8-9 (invalidates on \"logout, token revocation, or tenant suspension\"), reviewer: native\nPlan baseline: original proposal — no ordering or guard between SessionMint writes and invalidation events\nRuntime evidence: unknown; the adapter's put/invalidate semantics are not visible in this repo\nState: pending\nComparison grid:\n| Choice | Current | A (facade generation guard) | B (accept risk, document TTL bound) | C (investigate adapter first) |\n|---|---|---|---|---|\n| R2 stale-write protection | none, pending | facade tracks an invalidation generation per tenant; a write whose read-generation is older than the current one is dropped and logged | none; plan documents the window (bounded by token TTL) as accepted | bounded probe of adapter put/invalidate ordering before choosing; value stays pending |\n| R1 injection | approved (D7) | fixed | fixed | fixed |\n| Adapter contract | retained (PLAN.md:12-13) | unchanged (guard lives in the facade) | unchanged | unchanged |\n| Tests | pending for this row | facade unit test: invalidate(tenant) between read and write drops the write | none required | none until decided |\nQuestion D8: A) Facade-level generation guard (recommended) / B) Accept and document the window / C) Investigate adapter ordering first\nActual answer: A — Facade generation guard (D8)\nAccepted scope: `AuthCache` keeps a per-tenant invalidation generation; reads return the generation observed, writes carry it, and a write whose generation is older than the current one is dropped and logged (`auth_cache.stale_write_dropped`). Adapter unchanged. Required proof: facade unit test for the interleaving read(A) → invalidate(A) → write(A) asserting the entry is absent; plus the no-invalidation control case where the write lands. Implementation note: verify the adapter's write API first; if it already rejects stale writes, implement the guard as a thin passthrough and keep the test.\nHistory: none\n\n### R3: validateAndDispatch() error handling\nFinding: Code Quality #1, P1, confidence 8/10, PLAN.md:23-24 (\"60 lines with three nested try/catch blocks; each catch swallows a different error class\"), reviewer: native\nPlan baseline: original proposal — keep the three nested catches as described (plan states the shape, proposes no change)\nRuntime evidence: function source not in this repo; the plan's own description is the evidence\nState: pending\nComparison grid:\n| Choice | Current | A (typed result + single boundary) | B (keep nesting, log in each catch) | C (do nothing) |\n|---|---|---|---|---|\n| R3 error handling shape | 3 nested catches, each swallows one error class | split into validate() and dispatch(); each returns a discriminated result `{ok} \\| {ok:false, reason}`; one error boundary at the caller maps reason → response and logs; unknown errors propagate | same 3 nested catches; each catch logs the error with class + tenant before continuing | unchanged |\n| Error classes swallowed | 3, silently | 0 (every class becomes a named result or propagates) | 3, logged | 3, silently |\n| Tests | pending for this row | one unit test per reason branch + one for unknown-error propagation | one test per catch asserting the log line | none |\n| R1/R2 | approved | fixed | fixed | fixed |\nQuestion D9: A) Typed result + single error boundary (recommended) / B) Keep nesting, add logging per catch / C) Leave as is\nActual answer: A — Typed result + single boundary (D9)\nAccepted scope: split `validateAndDispatch()` into `validate()` and `dispatch()`, each returning a discriminated result (`{ok:true, ...} | {ok:false, reason}`); one error boundary at the caller maps reason → response + structured log; unknown errors propagate. Required proof: one unit test per `reason` branch, one for unknown-error propagation, one for the happy path. Call sites updated in the same change.\nHistory: none\n\n### R4: Regression contract for legacyAuthFlow() rewrite\nFinding: Test #1 (REGRESSION RULE), P1, confidence 9/10, PLAN.md:27-28 (\"The existing `legacyAuthFlow()` will get rewritten as part of this work; no regression test for the prior behavior is planned.\") + PLAN.md:14-16 (\"That coverage does not exercise legacyAuthFlow() or assert compatibility with its prior behavior.\"), reviewer: native\nPlan baseline: original proposal — rewrite with no regression coverage\nRuntime evidence: function source and callers not in this repo; behavior to preserve is unknown until characterized\nState: pending\nComparison grid:\n| Choice | Current | A (characterization + contract tests) | B (golden E2E only) | C (strangler: keep legacy behind a flag) |\n|---|---|---|---|---|\n| R4 how legacy behavior is protected | no regression test | before rewriting: characterization tests capturing legacyAuthFlow() outputs for each input class (valid, expired, wrong audience, wrong tenant, revoked, IDP error); after: same tests run against the rewrite, intentional differences listed and asserted explicitly | one end-to-end login test per tenant type against the rewrite only | legacy path retained behind a feature flag; new path canaried; characterization tests still required to compare |\n| Intentional differences | unstated | enumerated in plan, each with its own assertion | implicit | enumerated |\n| Removal of legacy code | in this PR | in this PR after tests green | in this PR | follow-up PR after canary |\n| R1-R3 | approved | fixed | fixed | fixed |\nQuestion D10: A) Characterization tests before rewrite + explicit intentional-difference assertions (recommended) / B) Golden E2E login tests only / C) Strangler flag + characterization\nActual answer: A — Characterization + explicit differences (D10)\nAccepted scope: **CRITICAL** regression contract. Before touching `legacyAuthFlow()`: read it and its callers, enumerate input classes (at minimum: valid token; expired; wrong audience; wrong issuer; unknown tenant; revoked; suspended tenant; IDP unavailable; malformed token), write one characterization test per class capturing current output/side effects. After rewrite: same suite runs against the new path. Intentional differences are listed in the plan (section \"Intentional behavior differences\") with one explicit assertion each. Legacy removal happens in this PR only after the suite is green.\nHistory: none\n\n### R5: End-to-end coverage depth for the multi-tenant auth flow\nFinding: Test #2, P2, confidence 8/10, PLAN.md:14-15 (\"Unit and integration coverage is planned for the new components and their success/error paths\") — no end-to-end flow test named for an auth path spanning AuthBroker → AuthCache → SessionMint → IDP, reviewer: native\nPlan baseline: original proposal — unit + integration per component\nRuntime evidence: none (no source); E2E harness existence unknown\nState: pending\nComparison grid:\n| Choice | Current | A (unit + integration + E2E suite) | B (unit + integration only) |\n|---|---|---|---|\n| R5 verification depth | unit + integration, pending | adds an E2E suite: login for tenant A and B in the same process (isolation), suspend A mid-session (B unaffected, A's next request 401), concurrent mint for same tenant, IDP timeout surfaced as `idp_unavailable` | plan as written |\n| R1-R4 and their required tests | approved | fixed | fixed |\nQuestion D11: A) Add the multi-tenant E2E suite (recommended) / B) Unit + integration only\nActual answer: A — Add the multi-tenant E2E suite (D11)\nAccepted scope: E2E suite with a fake IDP fixture and composition-root harness, four scenarios: (1) tenants A and B log in within one process and each is served only its own cache entry; (2) suspend A mid-session → A's next request is 401 `revoked`/`unknown_tenant` per the intentional-differences list, B unaffected; (3) two concurrent mints for the same tenant → exactly one cache entry, no error; (4) IDP timeout → `idp_unavailable` within the configured bound, no hang.\nHistory: none\n\n### R6: Token validation IDP call strategy\nFinding: Performance #1, P2, confidence 7/10, PLAN.md:31-32 (\"Token validation issues 5 sequential API calls to the IDP; they could be parallelized via Promise.all trivially (calls are independent)\"), reviewer: native\nPlan baseline: original proposal — parallelize with bare `Promise.all` (stated as a possibility, not yet committed)\nRuntime evidence: none (no source); which 5 calls, their latency and their idempotency are unknown\nState: pending\nComparison grid:\n| Choice | Current | A (Promise.all + per-call timeout + one error mapping) | B (bare Promise.all) | C (keep sequential) |\n|---|---|---|---|---|\n| R6 call strategy | 5 sequential, pending | 5 concurrent via `Promise.all`; each call wrapped in a timeout (value: configurable, default 2000 ms per call); first failure aborts the rest via AbortSignal and maps to `idp_unavailable` or the specific reason; discovery/JWKS responses cached per issuer with refresh-on-unknown-kid, one retry [Layer 1] | 5 concurrent, no timeout, first rejection surfaces raw | unchanged |\n| Worst-case latency | 5 × IDP latency | max(IDP latency, 2000 ms) | unbounded (slowest call) | 5 × unbounded |\n| Tests | pending for this row | one call times out → `idp_unavailable` within bound; one call rejects → others aborted; all succeed → single validation result; JWKS cache hit skips network | happy path only | none |\n| R1-R5 | approved | fixed | fixed | fixed |\nQuestion D12: A) Promise.all with per-call timeout, abort-on-first-failure and JWKS caching (recommended) / B) Bare Promise.all as the plan suggests / C) Keep sequential\nActual answer: A — Promise.all + timeout + abort + JWKS cache (D12)\nAccepted scope: the 5 IDP calls run via `Promise.all`; each wrapped in a per-call timeout (configurable, default 2000 ms) sharing one `AbortController`; first failure aborts the rest and maps to `idp_unavailable` (timeout/network) or the specific D9 reason; discovery + JWKS documents cached per issuer with refresh-on-unknown-`kid`, one retry. Required proof: timeout → `idp_unavailable` within bound; one rejection → remaining calls aborted; all succeed → one result; JWKS cache hit → no network call.\nHistory: none\n\n### T1: TODOS.md entry for deferred TokenStore\nFinding: derived from S1 (D4), reviewer: native\nState: approved\nQuestion D13: A) Add to TODOS.md (recommended) / B) Skip / C) Build it now in this PR\nActual answer: A — Add to TODOS.md (D13)\nAccepted scope: TODOS.md entry below. **Not persisted yet**: plan mode forbids writing repo files other than the plan; write it (and the D1 CLAUDE.md routing section) immediately after plan mode exits.\n\nApproval readiness: PASS — S1 (D4), S2 (D5), S3 (D6), R1 (D7), R2 (D8), R3 (D9), R4 (D10), R5 (D11), R6 (D12), T1 (D13). Setup answers D1-D3 approve no engineering remedy. No remedy is pending or deferred.\n\n## Review output\n\n### Suppressed findings (confidence 3-4, appendix only)\n- (4/10) PLAN.md:7-8 — policy-version bump may cold-start every tenant at once (thundering herd on the IDP). Unverified: bump frequency and tenant count unknown. Reported in Section 4 as a watch item, no remedy.\n\n### NOT in scope\n- **TokenStore** — deferred (D4): no responsibility the retained adapter lacks is written down; re-enters via TODO below.\n- **Strangler flag / canary for the legacy rewrite** — not chosen (D10 picked characterization in-PR); revisit only if the intentional-differences list grows beyond a handful of items.\n- **Changing the retained cache adapter** — out of scope by the plan's own contract (PLAN.md:12-13); D8's guard lives in the facade precisely so the adapter and its tests stay untouched.\n- **Problem statement / office-hours design doc** — skipped (D2); the plan still lacks a stated \"why\". Recommended before a second refactor of this area.\n- **Per-tenant cache configuration** — enabled by D7 injection but not requested; no work planned.\n- **Distribution/CI** — no new artifact; N/A.\n\n### What already exists\n| Existing | Plan reuses? | Notes |\n|---|---|---|\n| Cache adapter keyed by (tenant, issuer, audience, policyVersion) with eviction + invalidation hooks and tests (PLAN.md:7-13) | Yes, unchanged, behind `AuthCache` | Correct call. `TokenStore` would have rebuilt part of it (deferred, D4). |\n| `legacyAuthFlow()` (PLAN.md:27) | Rewritten | Now protected by characterization tests (D10). Its input classes are the spec for the rewrite. |\n| `validateAndDispatch()` (PLAN.md:23) | Refactored (D9) | Existing callers must be updated to the result shape in the same change. |\n| Runtime built-ins: `Promise.all`, `AbortController`, timers | Yes (D12) | No new dependency needed for timeout/abort. [Layer 2 → use standard library] |\n| Existing OIDC/JWKS client, if any | Unknown | Check before writing a JWKS cache; most OIDC libraries ship one (reuse ladder rung 4). |\n\n### Diagrams\nIn the plan: composition root (D7), stale-write guard sequence (D8), validate/dispatch result flow (D9), IDP fan-out (D12). In code comments: `AuthCache` (generation guard sequence), `AuthBroker.validate` (fan-out + abort), the composition root (wiring diagram). Update these in the same commit as any change.\n\n### Failure modes\n| New codepath | Realistic failure | Test? | Handling? | User sees | Gap |\n|---|---|---|---|---|---|\n| `AuthCache.set` after invalidation | suspended tenant's session resurrected | yes (D8 interleaving test) | yes (generation guard, logged) | 401 on next request | none |\n| `AuthCache.get` | adapter throws (backend down) | **no** | not specified | unknown | **critical gap** → add: adapter error propagates as `cache_unavailable` reason; unit test |\n| `AuthBroker.validate` fan-out | one IDP call hangs | yes (D12 timeout test) | yes (timeout + abort) | 503 `idp_unavailable` | none |\n| `AuthBroker.validate` | unknown error | yes (D9 propagation test) | yes (boundary rethrows + logs) | 500, logged | none |\n| `RequestPolicy.decide` | policy for tenant missing | **no** | contract undefined (D5) | unknown | **critical gap** → contract must define the missing-policy outcome (deny by default) + test |\n| `SessionMint.mint` | signer failure | listed as GAP | propagates | 500 | test required (in coverage diagram) |\n| composition root | AuthCache constructed twice by mistake | **no** | none | split-brain cache, silent | flag: add a startup assertion or single factory; unit test that both services receive the same instance |\n| JWKS cache | key rotation, unknown `kid` | yes (D12 cache test) | refresh once then fail | 401 `bad_issuer`/`idp_unavailable` | none |\n\nCritical gaps flagged: 2 (adapter-error path in `AuthCache.get`; missing-policy outcome in `RequestPolicy`). Both are required proof of already-approved behavior (D9 reason enum, D5 contract requirement) and are added to Implementation Tasks without a new question.\n\n### Worktree parallelization strategy\n| Step | Modules touched | Depends on |\n|---|---|---|\n| 1. Characterization tests for legacyAuthFlow (D10) | auth/ (tests only) | — |\n| 2. AuthCache facade + generation guard + tests (D6, D8) | auth/cache/ | — |\n| 3. Composition root injection (D7) | app bootstrap/ | 2 |\n| 4. AuthBroker: validate() result type, IDP fan-out, JWKS cache, RequestPolicy contract (D9, D12, D5) | auth/broker/ | 2 |\n| 5. SessionMint over AuthCache (D6) | auth/mint/ | 2 |\n| 6. Boundary + call-site updates, legacy rewrite/removal | auth/, routes/ | 1, 3, 4, 5 |\n| 7. E2E suite + fake IDP (D11) | test/e2e/ | 3, 4, 5 |\n\nLanes: `Lane A: step 1 (independent)` / `Lane B: step 2 → step 3 (sequential, shared cache seam)` / `Lane C: step 4 (independent after 2)` / `Lane D: step 5 (independent after 2)` / `Lane E: step 6 → step 7 (after A-D merge)`.\nExecution order: launch A and B in parallel worktrees. Merge B. Launch C and D in parallel. Merge all. Then E sequentially.\nConflict flags: C and D both import `AuthCache` from auth/cache/ but should not modify it; if either needs a facade change, route it through Lane B first. Step 6 touches routes/ and auth/ broadly; keep it single-lane.\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific\nfinding above. Run with Claude Code or Codex; checkbox as you ship.\n\n- [ ] **T1 (P1, human: ~1.5d / CC: ~20min)** — auth/legacy — Write characterization tests for `legacyAuthFlow()` covering all 9 input classes before any rewrite\n  - Surfaced by: Test review — REGRESSION RULE, PLAN.md:27-28 (D10)\n  - Files: auth/legacy tests (new), the \"Intentional behavior differences\" list in this plan\n  - Verify: suite green against legacy; re-run green against rewrite with every difference listed and asserted\n- [ ] **T2 (P1, human: ~1d / CC: ~15min)** — auth/cache — Implement `AuthCache` facade with per-tenant invalidation generation; drop + log stale writes\n  - Surfaced by: Architecture #2, PLAN.md:10,20 (D8); DRY key construction (Code Quality #2)\n  - Files: auth/cache/AuthCache (new), its unit tests\n  - Verify: read(A) → invalidate(A) → write(A) leaves no entry; control case writes; adapter tests untouched and green\n- [ ] **T3 (P1, human: ~0.5d / CC: ~10min)** — app bootstrap — Construct one `AuthCache` at the composition root and inject into `AuthBroker` and `SessionMint`; delete module-level export\n  - Surfaced by: Architecture #1, PLAN.md:19-20 (D7); Failure modes (double construction)\n  - Files: composition root, AuthBroker/SessionMint constructors\n  - Verify: unit test asserts both services hold the same instance; grep shows no module-level `AuthCache` export\n- [ ] **T4 (P1, human: ~1.5d / CC: ~20min)** — auth/broker — Split `validateAndDispatch()` into `validate()`/`dispatch()` returning discriminated results; single error boundary; update call sites\n  - Surfaced by: Code Quality #1, PLAN.md:23-24 (D9)\n  - Files: auth/broker, boundary/caller, all call sites of validateAndDispatch\n  - Verify: one unit test per `reason`, one for unknown-error propagation, happy path; no `catch {}` that returns without a reason\n- [ ] **T5 (P1, human: ~0.5d / CC: ~10min)** — auth/cache — Map adapter errors in `AuthCache.get/set` to `cache_unavailable` and test it\n  - Surfaced by: Failure modes — critical gap #1 (required proof of D9 reason enum)\n  - Files: auth/cache/AuthCache, its unit tests\n  - Verify: fake adapter throws → `{ok:false, reason:'cache_unavailable'}`, logged with tenant\n- [ ] **T6 (P1, human: ~1d / CC: ~15min)** — auth/policy — Write the `RequestPolicy` contract (inputs, decision output, caller, missing-policy = deny) into the plan and implement with unit tests\n  - Surfaced by: Scope Challenge #2 (D5), Architecture #3, Failure modes — critical gap #2\n  - Files: auth/policy/RequestPolicy (new), tests, this plan's Architecture section\n  - Verify: tests for allow, policy_denied, and missing policy → deny\n- [ ] **T7 (P2, human: ~1.5d / CC: ~20min)** — auth/broker — Run the 5 IDP calls via `Promise.all` with per-call timeout (default 2000 ms), shared AbortController, and per-issuer discovery/JWKS cache\n  - Surfaced by: Performance #1, PLAN.md:31-32 (D12); Architecture #4 (IDP SPOF)\n  - Files: auth/broker validate path, idp client/cache module\n  - Verify: tests for timeout → `idp_unavailable`, single rejection aborts others, all-success, cache hit skips network; check for an existing OIDC client before writing the cache\n- [ ] **T8 (P2, human: ~2d / CC: ~30min)** — test/e2e — Multi-tenant E2E suite with fake IDP: isolation, mid-session suspension, concurrent mint, IDP timeout\n  - Surfaced by: Test review #2 (D11)\n  - Files: test/e2e (new), fake IDP fixture, composition-root harness\n  - Verify: all four scenarios pass against the wired app\n- [ ] **T9 (P3, human: ~15min / CC: ~2min)** — repo — Create TODOS.md with the deferred TokenStore entry; append gstack routing rules to CLAUDE.md (D1)\n  - Surfaced by: TODOS.md updates (D13); preamble D1\n  - Files: TODOS.md (new), CLAUDE.md\n  - Verify: files present after plan mode exits; commit\n- [ ] **T10 (P3, human: ~1h / CC: ~5min)** — plan — Add a problem statement (\"why multi-tenant, what breaks today\") to the plan header\n  - Surfaced by: Scope Challenge #5\n  - Files: this plan\n  - Verify: a reader can state the goal in one sentence\n\n_No new tasks from Performance #2 (watch item only)._\n\nEffort assumptions: tests ~50x, architecture ~5x, features ~30x human÷CC; estimates assume the target repo already has a test runner and an HTTP client.\n\n### TODOS.md entry (not persisted — write after plan mode exits)\n```markdown\n  # TODOS\n\n  ## Auth\n\n  ### Decide whether TokenStore is needed and define its contract\n\n**What:** Determine if any token state (refresh tokens, non-cache session material) needs a home outside the retained cache adapter; if so, define TokenStore's contract and inject it via the composition root.\n\n**Why:** The adapter already keys, evicts and invalidates tokens. A second holder without a contract is a stale-token bug factory. Deferred in /plan-eng-review D4 (2026-09-16) because PLAN.md listed TokenStore with no responsibility.\n\n**Context:** PLAN.md:35 named TokenStore among 4 new classes. The review kept AuthCache (facade, D6), injected it (D7), and added a stale-write guard (D8). Start by listing what SessionMint stores that is not a cache entry; if the list is empty, close this TODO.\n\n**Effort:** M\n**Priority:** P3\n**Depends on:** RequestPolicy contract (T6), composition root (T3)\n```\n\n### Unresolved decisions that may bite you later\nNone. All thirteen briefs (D1-D13) received actual answers.\n\n### Completion summary\n- Step 0: Scope Challenge — scope reduced per recommendation (TokenStore deferred; RequestPolicy kept; facade kept)\n- Architecture Review: 4 issues found\n- Code Quality Review: 3 issues found\n- Test Review: diagram produced, 38 gaps identified (9 CRITICAL regression, 4 E2E)\n- Performance Review: 2 issues found\n- NOT in scope: written\n- What already exists: written\n- TODOS.md updates: 1 item proposed to user (accepted; not persisted until plan mode exits)\n- Failure modes: 2 critical gaps flagged (both converted to tasks T5, T6)\n- Unresolved decisions: 0 in this review\n- Outside voice: provider codex, disabled (codex_reviews=disabled; intentional opt-out, no native fallback)\n- Parallelization: 5 lanes, 4 parallel / 1 sequential\n- Lake Score: 6/6 (D7, D8, D9, D10, D11, D12 all selected 10/10; D1-D6, D13 differ in kind)\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | — | — |\n| Outside Review | codex via `/plan-eng-review` | Independent 2nd opinion | 1 | disabled (host: claude, provider: codex, phase: plan-review) | — |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | ISSUES OPEN | 47 issues (9 arch/quality/perf + 38 test gaps), 2 critical gaps |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | — | — |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | — | — |\n\n- **OUTSIDE COVERAGE:** provider codex, phase plan-review, status disabled (`codex_reviews=disabled`, intentional opt-out; no native fallback dispatched, no outside findings). Re-enable with `gstack-config set codex_reviews enabled`.\n- **VERDICT:** No reviews CLEAR. Eng Review is ISSUES OPEN: 2 critical gaps (adapter-error path in `AuthCache.get`, missing-policy outcome in `RequestPolicy`) are mapped to tasks T5 and T6 and close when those land; 0 unresolved decisions. eng review required.\n\nNO UNRESOLVED DECISIONS\n",
      "planSha256": "e580f0617f0193ce13537883be5e00c90acaa80df09ce4a894f5cb37471361be"
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