gstack/test/fixtures/eng-a689-count-public.json

{
  "source": "a68977d691e8d0cd7bcde863bb6c056b4aed77d4",
  "originalOutcome": "timeout",
  "windowStart": "2026-09-16T13:40:13.398Z",
  "windowEnd": "2026-09-16T14:05:08.409Z",
  "provenance": "Exact full native call objects and exact final report excerpts from the retained first attempt; this fixture is not a passing original workflow.",
  "calls": [
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01LPXLzP4Z6o91HTiRZM7NsF",
      "questions": [
        {
          "question": "D1 — How many moving parts should this refactor introduce?\nProject/branch/task: main — Multi-tenant Auth Refactor plan (PLAN.md), a reorganization that promises no product behavior change.\nELI10: The plan adds five new classes across twelve files to move code around without changing what users can do. Two of the five look like they do nothing on their own: AuthCache is described as a pass-through over the existing cache adapter (PLAN.md:20-22), and RequestPolicy is a stateless allow/deny function wearing a class (PLAN.md:9-13). A third, TokenStore, is named only in the scope list (PLAN.md:44-45) and has no description anywhere in the plan. Every extra layer is one more place a 3am bug can hide and one more file the next engineer has to read before touching auth.\nStakes if we pick wrong: Too many layers and the 'refactor' ships more surface area than it removes, with a wrapper class nobody can explain in six months; too few and two services share cache plumbing with no seam for tests.\nRecommendation: B because a behavior-preserving refactor should net out simpler than what it replaces, and the two services plus one pure function are the only parts the plan actually describes doing work.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Keep all 5 classes as planned (human: ~3 days / CC: ~45 min)\n  ✅ Matches the author's mental model; every named concept gets its own file and test suite\n  ✅ AuthCache gives one place to later add service-facing behavior if it ever grows\n  ❌ Two of five classes add no logic today; TokenStore is undefined, so its scope is unbounded\n  ❌ 12 files for a no-behavior-change refactor is the largest diff for the least user-visible gain\nB) 3 units: AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade, TokenStore dropped unless defined (recommended) (human: ~1.5 days / CC: ~25 min)\n  ✅ Both services depend on the existing tested adapter directly; the facade's 'unchanged rules' promise becomes true by construction\n  ✅ decideAccess(claims, ctx) as an exported function is trivially unit-testable and cannot accumulate hidden state\n  ✅ Roughly 7-8 files instead of 12; the adapter, its hooks and its tests stay untouched as the plan already requires\n  ❌ If TokenStore had a real job (e.g. refresh-token persistence), the author must write it down before it can come back\n  ❌ Services touch the adapter interface directly, so an adapter signature change later touches two callers instead of one\nC) 4 units: as B but keep AuthCache as a thin facade (human: ~2 days / CC: ~30 min)\n  ✅ One narrow interface for both services; the adapter can change behind it without touching AuthBroker or SessionMint\n  ✅ RequestPolicy still collapses to a function and TokenStore still needs a definition before it exists\n  ❌ The facade is pass-through today, so its tests would only prove it forwards calls; premature abstraction until a second backing cache exists\n  ❌ Adds a layer whose invalidation semantics must be re-documented even though the plan says they are unchanged\nNet: You are trading a seam you might need later (AuthCache) against a smaller, more explainable diff now; how the cache is shared (module export vs injection) is decided separately in the Architecture section under every option.",
          "header": "Structure",
          "multiSelect": false,
          "options": [
            {
              "label": "B) 3 units, no facade (recommended)",
              "description": "AuthBroker + SessionMint classes; RequestPolicy becomes an exported pure function decideAccess(claims, ctx); no AuthCache facade, both services use the existing adapter directly; TokenStore is dropped unless the author supplies a responsibility the adapter lacks. ~7-8 files. human: ~1.5 days / CC: ~25 min."
            },
            {
              "label": "A) Keep all 5 classes",
              "description": "AuthBroker, TokenStore, SessionMint, AuthCache, RequestPolicy as separate classes across 12 files, exactly as PLAN.md proposes. TokenStore still needs a written responsibility. human: ~3 days / CC: ~45 min."
            },
            {
              "label": "C) 4 units, keep thin facade",
              "description": "Same as B but retain AuthCache as a thin service-facing facade over the adapter (one backing cache). RequestPolicy still a pure function; TokenStore still needs a definition. human: ~2 days / CC: ~30 min."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D1 — How many moving parts should this refactor introduce?\nProject/branch/task: main — Multi-tenant Auth Refactor plan (PLAN.md), a reorganization that promises no product behavior change.\nELI10: The plan adds five new classes across twelve files to move code around without changing what users can do. Two of the five look like they do nothing on their own: AuthCache is described as a pass-through over the existing cache adapter (PLAN.md:20-22), and RequestPolicy is a stateless allow/deny function wearing a class (PLAN.md:9-13). A third, TokenStore, is named only in the scope list (PLAN.md:44-45) and has no description anywhere in the plan. Every extra layer is one more place a 3am bug can hide and one more file the next engineer has to read before touching auth.\nStakes if we pick wrong: Too many layers and the 'refactor' ships more surface area than it removes, with a wrapper class nobody can explain in six months; too few and two services share cache plumbing with no seam for tests.\nRecommendation: B because a behavior-preserving refactor should net out simpler than what it replaces, and the two services plus one pure function are the only parts the plan actually describes doing work.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Keep all 5 classes as planned (human: ~3 days / CC: ~45 min)\n  ✅ Matches the author's mental model; every named concept gets its own file and test suite\n  ✅ AuthCache gives one place to later add service-facing behavior if it ever grows\n  ❌ Two of five classes add no logic today; TokenStore is undefined, so its scope is unbounded\n  ❌ 12 files for a no-behavior-change refactor is the largest diff for the least user-visible gain\nB) 3 units: AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade, TokenStore dropped unless defined (recommended) (human: ~1.5 days / CC: ~25 min)\n  ✅ Both services depend on the existing tested adapter directly; the facade's 'unchanged rules' promise becomes true by construction\n  ✅ decideAccess(claims, ctx) as an exported function is trivially unit-testable and cannot accumulate hidden state\n  ✅ Roughly 7-8 files instead of 12; the adapter, its hooks and its tests stay untouched as the plan already requires\n  ❌ If TokenStore had a real job (e.g. refresh-token persistence), the author must write it down before it can come back\n  ❌ Services touch the adapter interface directly, so an adapter signature change later touches two callers instead of one\nC) 4 units: as B but keep AuthCache as a thin facade (human: ~2 days / CC: ~30 min)\n  ✅ One narrow interface for both services; the adapter can change behind it without touching AuthBroker or SessionMint\n  ✅ RequestPolicy still collapses to a function and TokenStore still needs a definition before it exists\n  ❌ The facade is pass-through today, so its tests would only prove it forwards calls; premature abstraction until a second backing cache exists\n  ❌ Adds a layer whose invalidation semantics must be re-documented even though the plan says they are unchanged\nNet: You are trading a seam you might need later (AuthCache) against a smaller, more explainable diff now; how the cache is shared (module export vs injection) is decided separately in the Architecture section under every option.": "B) 3 units, no facade (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:42:49.904Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01G9jky6T46TNnQaRu4bmdnM",
      "questions": [
        {
          "question": "D2 — How should the two services get hold of the one cache adapter?\nProject/branch/task: main — Multi-tenant Auth Refactor; D1 already settled on AuthBroker + SessionMint sharing the existing adapter directly.\nELI10: The plan wires both services to a single object that lives at the top of a module, so anything that imports the module can reach in and change it. That works until two tests run in the same process and one leaks a tenant's cached token into the next, or until a second app entry point (a worker, a CLI) imports the module and silently gets the same live cache. Passing the adapter in through each service's constructor makes the dependency visible in the signature, lets tests hand each service a throwaway fake, and keeps exactly one production instance because one bootstrap file creates it.\nStakes if we pick wrong: Cross-test token leakage in the auth suite (flaky or falsely green tests), and hidden coupling between every importer and one process-wide mutable cache.\nRecommendation: A because it is the standard fix for shared mutable module state, costs one constructor parameter per service, and makes the \"one backing cache\" promise a fact enforced by the composition root rather than by convention.\nCompleteness: A=10/10, B=3/10, C=6/10\nPros / cons:\nA) Constructor injection from one composition root (recommended) (human: ~2h / CC: ~5 min)\n  ✅ Dependency is explicit in each service's signature; tests construct a fresh fake adapter per case\n  ✅ Exactly one production instance is guaranteed by the bootstrap that creates and passes it\n  ✅ Matches the search-check result: DI over module singletons for per-request mutable state [Layer 1]\n  ❌ The existing bootstrap must be touched to construct and pass the adapter (one more file in the diff)\nB) Keep module-level export as planned (human: ~0 / CC: ~0)\n  ✅ Smallest possible diff; both services just import the instance\n  ✅ Familiar pattern in the codebase if other modules already do this\n  ❌ Every importer shares one live mutable cache; test isolation requires module mocking or ordering luck\n  ❌ A second entry point importing the module gets production cache behavior with no way to opt out\nC) Module-level export plus a test-only reset hook (human: ~1h / CC: ~3 min)\n  ✅ Keeps the import-and-use ergonomics while giving tests a way to clear state between cases\n  ✅ No bootstrap change needed\n  ❌ Test-only code ships in production modules; forgetting to call the hook reintroduces cross-test leakage\n  ❌ Still one process-wide instance, so the hidden-coupling problem is unchanged\nNet: You are trading one bootstrap edit for explicit dependencies and clean test isolation; B and C keep the diff smaller by leaving the shared-state problem in place.",
          "header": "Cache sharing",
          "multiSelect": false,
          "options": [
            {
              "label": "A) Constructor injection (recommended)",
              "description": "AuthBroker and SessionMint take the cache adapter as a constructor parameter. One composition root (the existing app bootstrap) constructs a single adapter instance and passes it to both. Tests construct each service with a fresh fake adapter. Completeness 10/10. human: ~2h / CC: ~5 min."
            },
            {
              "label": "B) Module-level export as planned",
              "description": "Export one adapter instance from a module; both services import it. No bootstrap change. Tests rely on module mocking or shared state. Completeness 3/10. human: ~0 / CC: ~0."
            },
            {
              "label": "C) Module export + test reset hook",
              "description": "As B, plus an exported __resetForTests() that clears the shared instance between tests. Test-only code in production module. Completeness 6/10. human: ~1h / CC: ~3 min."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D2 — How should the two services get hold of the one cache adapter?\nProject/branch/task: main — Multi-tenant Auth Refactor; D1 already settled on AuthBroker + SessionMint sharing the existing adapter directly.\nELI10: The plan wires both services to a single object that lives at the top of a module, so anything that imports the module can reach in and change it. That works until two tests run in the same process and one leaks a tenant's cached token into the next, or until a second app entry point (a worker, a CLI) imports the module and silently gets the same live cache. Passing the adapter in through each service's constructor makes the dependency visible in the signature, lets tests hand each service a throwaway fake, and keeps exactly one production instance because one bootstrap file creates it.\nStakes if we pick wrong: Cross-test token leakage in the auth suite (flaky or falsely green tests), and hidden coupling between every importer and one process-wide mutable cache.\nRecommendation: A because it is the standard fix for shared mutable module state, costs one constructor parameter per service, and makes the \"one backing cache\" promise a fact enforced by the composition root rather than by convention.\nCompleteness: A=10/10, B=3/10, C=6/10\nPros / cons:\nA) Constructor injection from one composition root (recommended) (human: ~2h / CC: ~5 min)\n  ✅ Dependency is explicit in each service's signature; tests construct a fresh fake adapter per case\n  ✅ Exactly one production instance is guaranteed by the bootstrap that creates and passes it\n  ✅ Matches the search-check result: DI over module singletons for per-request mutable state [Layer 1]\n  ❌ The existing bootstrap must be touched to construct and pass the adapter (one more file in the diff)\nB) Keep module-level export as planned (human: ~0 / CC: ~0)\n  ✅ Smallest possible diff; both services just import the instance\n  ✅ Familiar pattern in the codebase if other modules already do this\n  ❌ Every importer shares one live mutable cache; test isolation requires module mocking or ordering luck\n  ❌ A second entry point importing the module gets production cache behavior with no way to opt out\nC) Module-level export plus a test-only reset hook (human: ~1h / CC: ~3 min)\n  ✅ Keeps the import-and-use ergonomics while giving tests a way to clear state between cases\n  ✅ No bootstrap change needed\n  ❌ Test-only code ships in production modules; forgetting to call the hook reintroduces cross-test leakage\n  ❌ Still one process-wide instance, so the hidden-coupling problem is unchanged\nNet: You are trading one bootstrap edit for explicit dependencies and clean test isolation; B and C keep the diff smaller by leaving the shared-state problem in place.": "A) Constructor injection (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:45:07.797Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01DaL5C53KPmYPBMW98jZmw3",
      "questions": [
        {
          "question": "D3 — Should we check for a write-after-invalidation race before two services start writing to the cache?\nProject/branch/task: main — Multi-tenant Auth Refactor; AuthBroker and SessionMint both write to the one injected adapter (D1 → B, D2 → A).\nELI10: The cache clears a tenant's entries when that tenant is suspended, a token is revoked, or a user logs out. Nothing in the plan says what happens if a service finishes minting or validating a moment after that clear and then writes a fresh entry. If the adapter just stores whatever it is handed, a suspended tenant or revoked token could keep working until the entry expires. The plan already promises the adapter's rules are unchanged, but it doubles the number of writers, so this is the moment to find out what those rules actually are.\nStakes if we pick wrong: A revoked token or suspended tenant stays valid until TTL with no log line, which is a silent security failure; or we add a defensive recheck for a race the adapter already prevents.\nRecommendation: A because the risk is real but unconfirmed; reading the adapter's write path takes minutes and settles whether a guard is needed at all.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Investigate the adapter's write semantics first, guard only if unguarded (recommended) (human: ~2h / CC: ~10 min)\n  ✅ Decides from evidence: quote the adapter's write and invalidation code in the plan before adding any mechanism\n  ✅ If the adapter already guards by policy version or tenant status, no new code and no new test surface\n  ❌ Adds a step before implementation can start; the plan carries an unknown until it is done\nB) Add a recheck-before-write in both services now (human: ~1 day / CC: ~20 min)\n  ✅ Closes the window regardless of what the adapter does today\n  ✅ Two small, testable guards with obvious failure-injection tests\n  ❌ Possibly duplicates a guard the adapter already has; adds a second read per write on the hot path\n  ❌ Puts invalidation logic in services when the plan says the adapter owns validity rules\nC) No guard, accept existing semantics (human: ~0 / CC: ~0)\n  ✅ Zero added code; consistent with \"adapter rules unchanged\"\n  ✅ If the legacy flow has the same window today, this is not a regression\n  ❌ Ships two writers against an unverified assumption; a real window would fail silently\nNet: You are trading a short investigation now against either speculative defensive code or an unverified security assumption.",
          "header": "Cache race",
          "multiSelect": false,
          "options": [
            {
              "label": "A) Investigate first (recommended)",
              "description": "Bounded probe before implementation: read the adapter's write path and its logout/revocation/suspension hooks; record in the plan whether writes are guarded by policy version or tenant status. Add a recheck-before-write in both services only if unguarded. human: ~2h / CC: ~10 min."
            },
            {
              "label": "B) Add recheck-before-write now",
              "description": "Both services re-read tenant status and policy version immediately before writing and skip the write if either changed. Guards regardless of adapter behavior. human: ~1 day / CC: ~20 min."
            },
            {
              "label": "C) No guard",
              "description": "Accept the adapter's existing semantics without checking. No new code. human: ~0 / CC: ~0."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D3 — Should we check for a write-after-invalidation race before two services start writing to the cache?\nProject/branch/task: main — Multi-tenant Auth Refactor; AuthBroker and SessionMint both write to the one injected adapter (D1 → B, D2 → A).\nELI10: The cache clears a tenant's entries when that tenant is suspended, a token is revoked, or a user logs out. Nothing in the plan says what happens if a service finishes minting or validating a moment after that clear and then writes a fresh entry. If the adapter just stores whatever it is handed, a suspended tenant or revoked token could keep working until the entry expires. The plan already promises the adapter's rules are unchanged, but it doubles the number of writers, so this is the moment to find out what those rules actually are.\nStakes if we pick wrong: A revoked token or suspended tenant stays valid until TTL with no log line, which is a silent security failure; or we add a defensive recheck for a race the adapter already prevents.\nRecommendation: A because the risk is real but unconfirmed; reading the adapter's write path takes minutes and settles whether a guard is needed at all.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Investigate the adapter's write semantics first, guard only if unguarded (recommended) (human: ~2h / CC: ~10 min)\n  ✅ Decides from evidence: quote the adapter's write and invalidation code in the plan before adding any mechanism\n  ✅ If the adapter already guards by policy version or tenant status, no new code and no new test surface\n  ❌ Adds a step before implementation can start; the plan carries an unknown until it is done\nB) Add a recheck-before-write in both services now (human: ~1 day / CC: ~20 min)\n  ✅ Closes the window regardless of what the adapter does today\n  ✅ Two small, testable guards with obvious failure-injection tests\n  ❌ Possibly duplicates a guard the adapter already has; adds a second read per write on the hot path\n  ❌ Puts invalidation logic in services when the plan says the adapter owns validity rules\nC) No guard, accept existing semantics (human: ~0 / CC: ~0)\n  ✅ Zero added code; consistent with \"adapter rules unchanged\"\n  ✅ If the legacy flow has the same window today, this is not a regression\n  ❌ Ships two writers against an unverified assumption; a real window would fail silently\nNet: You are trading a short investigation now against either speculative defensive code or an unverified security assumption.": "A) Investigate first (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:46:13.536Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01MowedohcC8T5w2DZ4LmWEd",
      "questions": [
        {
          "question": "D4 — How should validateAndDispatch() handle the three error classes it currently swallows?\nProject/branch/task: main — Multi-tenant Auth Refactor; AuthBroker.validateAndDispatch() is the request-path entry point that calls decideAccess() between validation and dispatch.\nELI10: Today the function is 60 lines with a try/catch inside a try/catch inside a try/catch, and each one quietly eats a different kind of error. When something goes wrong at 3am, the request either fails with no log line or, worse, continues as if nothing happened. A flat sequence of three named steps with one error boundary at the end turns every failure into a named result (validation failed, access denied, dispatch failed) that gets logged with the tenant and reason and handed back to the caller. It also forces the plan to say what happens when the access decision is \"deny\", which it currently does not.\nStakes if we pick wrong: Silent auth failures that are impossible to debug from logs, and a deny path whose behavior is whatever the first implementer happens to write.\nRecommendation: A because a refactor is the moment to fix structure, swallowing auth errors is a security-grade bug not a style issue, and the flat form is shorter than what it replaces.\nCompleteness: A=10/10, B=7/10, C=0/10\nPros / cons:\nA) Flat pipeline with one boundary and typed outcomes (recommended) (human: ~1 day / CC: ~15 min)\n  ✅ Every failure class becomes a named, logged outcome; nothing is swallowed and Denied is explicit\n  ✅ Each step (validate, decideAccess, dispatch) is independently unit-testable; the function shrinks well under 60 lines\n  ✅ Matches \"explicit over clever\": the caller sees exactly one result type to handle\n  ❌ Callers of validateAndDispatch() must be updated to handle the typed outcome instead of relying on silent success\nB) Keep nesting, log and rethrow typed errors from each catch (human: ~3h / CC: ~8 min)\n  ✅ Smaller structural change; stops the swallowing with three log-and-rethrow edits\n  ✅ Callers see typed errors without a signature change\n  ❌ Still three boundaries in one 60-line function; the nesting that made the bugs hard to see stays\n  ❌ Deny handling is still unspecified\nC) Leave as is (human: ~0 / CC: ~0)\n  ✅ No risk of changing observable behavior during the refactor\n  ✅ Zero effort\n  ❌ Ships known silent error swallowing in the auth path; the refactor preserves the worst part of the code it reorganizes\nNet: You are trading a caller-signature update for auth failures that are visible, typed and tested; B stops the bleeding without fixing the structure; C keeps a known bug.",
          "header": "Error handling",
          "multiSelect": false,
          "options": [
            {
              "label": "A) Flat pipeline, typed outcomes (recommended)",
              "description": "validateAndDispatch() becomes a flat sequence of named steps (validate → decideAccess → dispatch) with one error boundary. Every failure maps to a typed outcome (ValidationFailed / Denied / DispatchFailed), each logged with tenant and reason; nothing swallowed. Callers updated to handle the outcome. Completeness 10/10. human: ~1 day / CC: ~15 min."
            },
            {
              "label": "B) Keep nesting, log + rethrow typed errors",
              "description": "Keep the three try/catch blocks; each catch logs with tenant and reason and rethrows a typed error instead of swallowing. Deny handling still unspecified. Completeness 7/10. human: ~3h / CC: ~8 min."
            },
            {
              "label": "C) Leave as is",
              "description": "Preserve the 60-line nested structure and the swallowing catches. Completeness 0/10. human: ~0 / CC: ~0."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D4 — How should validateAndDispatch() handle the three error classes it currently swallows?\nProject/branch/task: main — Multi-tenant Auth Refactor; AuthBroker.validateAndDispatch() is the request-path entry point that calls decideAccess() between validation and dispatch.\nELI10: Today the function is 60 lines with a try/catch inside a try/catch inside a try/catch, and each one quietly eats a different kind of error. When something goes wrong at 3am, the request either fails with no log line or, worse, continues as if nothing happened. A flat sequence of three named steps with one error boundary at the end turns every failure into a named result (validation failed, access denied, dispatch failed) that gets logged with the tenant and reason and handed back to the caller. It also forces the plan to say what happens when the access decision is \"deny\", which it currently does not.\nStakes if we pick wrong: Silent auth failures that are impossible to debug from logs, and a deny path whose behavior is whatever the first implementer happens to write.\nRecommendation: A because a refactor is the moment to fix structure, swallowing auth errors is a security-grade bug not a style issue, and the flat form is shorter than what it replaces.\nCompleteness: A=10/10, B=7/10, C=0/10\nPros / cons:\nA) Flat pipeline with one boundary and typed outcomes (recommended) (human: ~1 day / CC: ~15 min)\n  ✅ Every failure class becomes a named, logged outcome; nothing is swallowed and Denied is explicit\n  ✅ Each step (validate, decideAccess, dispatch) is independently unit-testable; the function shrinks well under 60 lines\n  ✅ Matches \"explicit over clever\": the caller sees exactly one result type to handle\n  ❌ Callers of validateAndDispatch() must be updated to handle the typed outcome instead of relying on silent success\nB) Keep nesting, log and rethrow typed errors from each catch (human: ~3h / CC: ~8 min)\n  ✅ Smaller structural change; stops the swallowing with three log-and-rethrow edits\n  ✅ Callers see typed errors without a signature change\n  ❌ Still three boundaries in one 60-line function; the nesting that made the bugs hard to see stays\n  ❌ Deny handling is still unspecified\nC) Leave as is (human: ~0 / CC: ~0)\n  ✅ No risk of changing observable behavior during the refactor\n  ✅ Zero effort\n  ❌ Ships known silent error swallowing in the auth path; the refactor preserves the worst part of the code it reorganizes\nNet: You are trading a caller-signature update for auth failures that are visible, typed and tested; B stops the bleeding without fixing the structure; C keeps a known bug.": "A) Flat pipeline, typed outcomes (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:47:31.343Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01N382xrCxGpmf2WHN8nqnwC",
      "questions": [
        {
          "question": "D5 — How do we prove the rewrite of legacyAuthFlow() keeps the behavior users rely on?\nProject/branch/task: main — Multi-tenant Auth Refactor; legacyAuthFlow() is being replaced by AuthBroker.validateAndDispatch() (D1 → B, D4 → A).\nELI10: The plan rewrites the function that decides whether every request is allowed in, and it plans zero tests that compare the new version to the old one. The new component tests only prove the new code does what the new code's author thinks it should. A characterization suite runs the same set of inputs (good token, expired token, revoked token, wrong tenant, suspended tenant, IDP down, and so on) through both the old and the new code and asserts they agree, except for the differences we chose on purpose. Only when that suite is green does the old function get deleted.\nStakes if we pick wrong: A tenant that could log in yesterday cannot today, or worse, one that should be blocked gets in, and there is no test that would have caught either.\nRecommendation: A because the input space for auth is small and enumerable, a fake adapter and fake IDP make the full matrix cheap, and anything less leaves a named blind spot in the login path.\nCompleteness: A=10/10, B=7/10, C=10/10 (C adds a production step, not more test coverage)\nPros / cons:\nA) Full characterization matrix over both implementations, then delete legacy (recommended) (human: ~2 days / CC: ~30 min)\n  ✅ Every observable outcome (allow / deny / error class), cache write and IDP call set is asserted identical except the enumerated intentional differences\n  ✅ Includes one end-to-end path through the real entry point with a fake IDP, so wiring bugs surface, not just unit logic\n  ✅ Legacy code is deleted with evidence rather than hope; intentional differences are written down where a reviewer can challenge them\n  ❌ Requires building fixtures for the full matrix before the rewrite starts (make-change-easy-first ordering)\nB) Parity on happy path plus the three caught error classes (human: ~1 day / CC: ~15 min)\n  ✅ Covers the paths the plan already names, with the same both-implementations assertion style\n  ✅ Faster to write; still forces the intentional-differences list\n  ❌ Expired, revoked, wrong-audience, suspended-tenant and IDP-outage paths are unasserted; those are exactly the security-relevant edges\n  ❌ A green suite would still allow a regression on any unlisted path\nC) A plus a 7-day production shadow run before cutover (human: ~1 week / CC: ~45 min + calendar time)\n  ✅ Catches real-traffic shapes no fixture author thought of\n  ✅ Cutover is a flag flip with data behind it, so rollback is trivial\n  ❌ Requires running both flows in production and a diff pipeline; adds a week and operational load to a refactor\n  ❌ Shadowing an auth path doubles IDP calls per request for the shadow period\nNet: You are trading two days of fixture work for a rewrite of the login path that is proven equivalent; B leaves the security edges untested; C buys extra certainty with a week of production plumbing.",
          "header": "Regression",
          "multiSelect": false,
          "options": [
            {
              "label": "A) Full characterization matrix (recommended)",
              "description": "Build fixtures for the full matrix (valid, expired, revoked, wrong issuer, wrong audience, suspended tenant, policy-version mismatch, IDP timeout, IDP 5xx, malformed token, deny decision, cache hit/miss). Assert identical outcome, cache writes and IDP call set for legacyAuthFlow() and validateAndDispatch(), except the enumerated intentional differences (typed outcomes per D4). One E2E path through the real entry point with a fake IDP. Delete legacy only when green. Completeness 10/10. human: ~2 days / CC: ~30 min."
            },
            {
              "label": "B) Happy path + three error classes",
              "description": "Same both-implementations assertion style over the happy path and the three error classes validateAndDispatch() currently catches. Security edges (expired, revoked, wrong audience, suspended, IDP outage) unasserted. Completeness 7/10. human: ~1 day / CC: ~15 min."
            },
            {
              "label": "C) Full matrix + production shadow",
              "description": "Everything in A, plus run legacy and new side by side in production for 7 days behind a flag, diffing outcomes, before cutover. Completeness 10/10 plus an operational step. human: ~1 week / CC: ~45 min + calendar time."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D5 — How do we prove the rewrite of legacyAuthFlow() keeps the behavior users rely on?\nProject/branch/task: main — Multi-tenant Auth Refactor; legacyAuthFlow() is being replaced by AuthBroker.validateAndDispatch() (D1 → B, D4 → A).\nELI10: The plan rewrites the function that decides whether every request is allowed in, and it plans zero tests that compare the new version to the old one. The new component tests only prove the new code does what the new code's author thinks it should. A characterization suite runs the same set of inputs (good token, expired token, revoked token, wrong tenant, suspended tenant, IDP down, and so on) through both the old and the new code and asserts they agree, except for the differences we chose on purpose. Only when that suite is green does the old function get deleted.\nStakes if we pick wrong: A tenant that could log in yesterday cannot today, or worse, one that should be blocked gets in, and there is no test that would have caught either.\nRecommendation: A because the input space for auth is small and enumerable, a fake adapter and fake IDP make the full matrix cheap, and anything less leaves a named blind spot in the login path.\nCompleteness: A=10/10, B=7/10, C=10/10 (C adds a production step, not more test coverage)\nPros / cons:\nA) Full characterization matrix over both implementations, then delete legacy (recommended) (human: ~2 days / CC: ~30 min)\n  ✅ Every observable outcome (allow / deny / error class), cache write and IDP call set is asserted identical except the enumerated intentional differences\n  ✅ Includes one end-to-end path through the real entry point with a fake IDP, so wiring bugs surface, not just unit logic\n  ✅ Legacy code is deleted with evidence rather than hope; intentional differences are written down where a reviewer can challenge them\n  ❌ Requires building fixtures for the full matrix before the rewrite starts (make-change-easy-first ordering)\nB) Parity on happy path plus the three caught error classes (human: ~1 day / CC: ~15 min)\n  ✅ Covers the paths the plan already names, with the same both-implementations assertion style\n  ✅ Faster to write; still forces the intentional-differences list\n  ❌ Expired, revoked, wrong-audience, suspended-tenant and IDP-outage paths are unasserted; those are exactly the security-relevant edges\n  ❌ A green suite would still allow a regression on any unlisted path\nC) A plus a 7-day production shadow run before cutover (human: ~1 week / CC: ~45 min + calendar time)\n  ✅ Catches real-traffic shapes no fixture author thought of\n  ✅ Cutover is a flag flip with data behind it, so rollback is trivial\n  ❌ Requires running both flows in production and a diff pipeline; adds a week and operational load to a refactor\n  ❌ Shadowing an auth path doubles IDP calls per request for the shadow period\nNet: You are trading two days of fixture work for a rewrite of the login path that is proven equivalent; B leaves the security edges untested; C buys extra certainty with a week of production plumbing.": "A) Full characterization matrix (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:48:59.219Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01TC4xn1krsnS3P9mcrRzrdr",
      "questions": [
        {
          "question": "D6 — Should the Promise.all speed-up ship inside this refactor or right after it?\nProject/branch/task: main — Multi-tenant Auth Refactor; the plan promises no behavior change, then bundles a timing change to token validation.\nELI10: Right now validating a token makes five calls to the identity provider one after another, so users wait for five round trips. Firing them all at once is a real win, probably cutting that wait to one round trip. But the plan's whole point is to move code around without changing what it does, and the parity suite we just approved works by proving old and new behave identically. Mixing a deliberate behavior change into that diff makes every parity failure ambiguous: is it the refactor or the speed-up? Landing the speed-up as its own small change right after, with its own test, keeps both diffs honest.\nStakes if we pick wrong: Either a parity failure that cannot be attributed, hiding a real refactor bug behind an expected timing difference, or users keep waiting five round trips longer than they need to.\nRecommendation: A because separating structural from behavioral change is the cheapest way to keep the regression suite meaningful, and a follow-up PR costs minutes with CC.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Separate follow-up PR immediately after the refactor merges (recommended) (human: ~half day / CC: ~10 min)\n  ✅ Refactor diff stays behavior-preserving, so any parity failure points at the refactor itself\n  ✅ The parity suite records the real IDP call set first, turning \"calls are independent\" from a claim into an observed fact before the change\n  ✅ The follow-up carries its own test: five concurrent dispatches, one rejection yields ValidationFailed naming the failed call\n  ❌ Users get the latency win one PR later than they could\nB) Last commit of this PR, after the parity suite is green (human: ~half day / CC: ~10 min)\n  ✅ One PR delivers both the cleanup and the latency win\n  ✅ Same test requirement as A; independence is still confirmed by the parity suite before the commit\n  ❌ A reviewer reading the PR sees a behavior change in a \"no behavior change\" refactor; the parity suite needs an exception for timing/ordering in the same diff\n  ❌ Rollback of the refactor also rolls back the speed-up, and vice versa\nC) Do not parallelize (human: ~0 / CC: ~0)\n  ✅ Zero risk of changing IDP concurrency or error ordering\n  ✅ No new test surface\n  ❌ Leaves a five-round-trip wait on every cache miss that the author already identified as fixable\nNet: You are trading one PR of delay for two diffs that each prove exactly one thing; B saves a PR at the cost of attribution; C leaves known latency on the table.",
          "header": "Parallelize",
          "multiSelect": false,
          "options": [
            {
              "label": "A) Follow-up PR right after (recommended)",
              "description": "Land the refactor with the parity suite first. Then a separate PR replaces the 5 sequential IDP calls with Promise.all, after the parity suite has recorded the call set and a reviewer confirms independence. Includes a test that all 5 dispatch concurrently and a single rejection yields ValidationFailed naming the failing call. human: ~half day / CC: ~10 min."
            },
            {
              "label": "B) Last commit of this PR",
              "description": "Same change and same test, committed at the end of this PR once the parity suite is green. One PR carries refactor and speed-up together. human: ~half day / CC: ~10 min."
            },
            {
              "label": "C) Do not parallelize",
              "description": "Keep the 5 sequential calls. No change, no test. human: ~0 / CC: ~0."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D6 — Should the Promise.all speed-up ship inside this refactor or right after it?\nProject/branch/task: main — Multi-tenant Auth Refactor; the plan promises no behavior change, then bundles a timing change to token validation.\nELI10: Right now validating a token makes five calls to the identity provider one after another, so users wait for five round trips. Firing them all at once is a real win, probably cutting that wait to one round trip. But the plan's whole point is to move code around without changing what it does, and the parity suite we just approved works by proving old and new behave identically. Mixing a deliberate behavior change into that diff makes every parity failure ambiguous: is it the refactor or the speed-up? Landing the speed-up as its own small change right after, with its own test, keeps both diffs honest.\nStakes if we pick wrong: Either a parity failure that cannot be attributed, hiding a real refactor bug behind an expected timing difference, or users keep waiting five round trips longer than they need to.\nRecommendation: A because separating structural from behavioral change is the cheapest way to keep the regression suite meaningful, and a follow-up PR costs minutes with CC.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Separate follow-up PR immediately after the refactor merges (recommended) (human: ~half day / CC: ~10 min)\n  ✅ Refactor diff stays behavior-preserving, so any parity failure points at the refactor itself\n  ✅ The parity suite records the real IDP call set first, turning \"calls are independent\" from a claim into an observed fact before the change\n  ✅ The follow-up carries its own test: five concurrent dispatches, one rejection yields ValidationFailed naming the failed call\n  ❌ Users get the latency win one PR later than they could\nB) Last commit of this PR, after the parity suite is green (human: ~half day / CC: ~10 min)\n  ✅ One PR delivers both the cleanup and the latency win\n  ✅ Same test requirement as A; independence is still confirmed by the parity suite before the commit\n  ❌ A reviewer reading the PR sees a behavior change in a \"no behavior change\" refactor; the parity suite needs an exception for timing/ordering in the same diff\n  ❌ Rollback of the refactor also rolls back the speed-up, and vice versa\nC) Do not parallelize (human: ~0 / CC: ~0)\n  ✅ Zero risk of changing IDP concurrency or error ordering\n  ✅ No new test surface\n  ❌ Leaves a five-round-trip wait on every cache miss that the author already identified as fixable\nNet: You are trading one PR of delay for two diffs that each prove exactly one thing; B saves a PR at the cost of attribution; C leaves known latency on the table.": "A) Follow-up PR right after (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:51:06.372Z"
    },
    {
      "sessionId": "5e16c19b-5af9-4810-901e-e8e44e447366",
      "toolUseId": "toolu_01Tn8Xk6nffjXc2kbDaHJ6A7",
      "questions": [
        {
          "question": "D9 — What next after this eng review?\nProject/branch/task: gstack-plan-count-Q4W1N9 on main — Multi-tenant Auth Refactor plan, review complete.\nELI10: The plan has been reviewed and rewritten with your eight decisions applied. The only thing still open is whether the cache needs a recheck-before-write guard, and that depends on reading the adapter code first (task T1). There is no UI in this change, and the business scope was already narrowed, so the design and CEO reviews add little here.\nStakes if we pick wrong: Running unneeded reviews costs time; skipping the T1 probe before coding risks shipping the write-after-invalidation race.\nRecommendation: C because this is a backend-only refactor whose remaining open item is settled by an implementation-time probe, not another review.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review\n  ✅ Would challenge whether the refactor is worth doing at all before any code is written\n  ✅ Independent check on the scope cut made in D1\n  ❌ The plan author already framed this as a no-behavior-change refactor; scope was cut in D1 — little left to challenge\nB) Run /design-review\n  ✅ Would catch user-visible changes in error presentation for the new Denied / ValidationFailed outcomes\n  ✅ Cheap if the surface is small\n  ❌ There is no UI in this plan; error presentation is owned by existing callers, which are updated for typed outcomes only\nC) Ready to implement — run /ship when done (recommended)\n  ✅ Start with T1 (adapter probe) and T2 (SessionMint contract); the R3 guard question resolves itself from T1's result\n  ✅ All 13 findings have dispositions; tasks, lanes and the parity matrix are written into the plan\n  ❌ Leaves the plan formally \"issues open\" until the probe answers R3\nNet: Trade one more review round against starting the probe that actually closes the last open item.",
          "header": "Next step",
          "multiSelect": false,
          "options": [
            {
              "label": "C) Ready to implement (recommended)",
              "description": "Begin with T1 adapter probe + T2 SessionMint contract; run /ship when the work is done. Backend-only; no design/CEO review needed."
            },
            {
              "label": "A) Run /plan-ceo-review",
              "description": "Challenge whether the refactor is worth doing before coding. Little left after the D1 scope cut."
            },
            {
              "label": "B) Run /design-review",
              "description": "Check user-visible error presentation. No UI in this plan; callers are only updated for typed outcomes."
            }
          ]
        }
      ],
      "answered": true,
      "failed": false,
      "answers": {
        "D9 — What next after this eng review?\nProject/branch/task: gstack-plan-count-Q4W1N9 on main — Multi-tenant Auth Refactor plan, review complete.\nELI10: The plan has been reviewed and rewritten with your eight decisions applied. The only thing still open is whether the cache needs a recheck-before-write guard, and that depends on reading the adapter code first (task T1). There is no UI in this change, and the business scope was already narrowed, so the design and CEO reviews add little here.\nStakes if we pick wrong: Running unneeded reviews costs time; skipping the T1 probe before coding risks shipping the write-after-invalidation race.\nRecommendation: C because this is a backend-only refactor whose remaining open item is settled by an implementation-time probe, not another review.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review\n  ✅ Would challenge whether the refactor is worth doing at all before any code is written\n  ✅ Independent check on the scope cut made in D1\n  ❌ The plan author already framed this as a no-behavior-change refactor; scope was cut in D1 — little left to challenge\nB) Run /design-review\n  ✅ Would catch user-visible changes in error presentation for the new Denied / ValidationFailed outcomes\n  ✅ Cheap if the surface is small\n  ❌ There is no UI in this plan; error presentation is owned by existing callers, which are updated for typed outcomes only\nC) Ready to implement — run /ship when done (recommended)\n  ✅ Start with T1 (adapter probe) and T2 (SessionMint contract); the R3 guard question resolves itself from T1's result\n  ✅ All 13 findings have dispositions; tasks, lanes and the parity matrix are written into the plan\n  ❌ Leaves the plan formally \"issues open\" until the probe answers R3\nNet: Trade one more review round against starting the probe that actually closes the last open item.": "C) Ready to implement (recommended)"
      },
      "unansweredQuestionIndices": [],
      "answeredAt": "2026-09-16T13:59:29.964Z"
    }
  ],
  "parts": [
    "# Plan: Multi-tenant Auth Refactor (reviewed)\n\nReviewed target: `PLAN.md` (\"Plan: Multi-tenant Auth Refactor\") in `gstack-plan-count-Q4W1N9`, branch `main`, commit `8636c2b`.\nReview: `/plan-eng-review`, 2026-09-16. Prerequisite `/office-hours` skipped at the user's request.\nEvidence basis: the repository contains only `CLAUDE.md` and `PLAN.md`; no implementation code exists to probe. Every \"runtime evidence\" entry below is therefore graded against the plan text and marked unknown where the plan does not say.",
    "### R4: validateAndDispatch() error handling structure\nFinding: Q1, P1, confidence 9/10, PLAN.md:32-33 (\"The `validateAndDispatch()` function is 60 lines with three nested try/catch blocks; each catch swallows a different error class.\"), plus A3, P2, confidence 7/10, PLAN.md:9-13 (decideAccess returns allow or deny; the plan never says what the caller does on deny), reviewer: plan-eng-review (Code Quality + Architecture).\nPlan baseline: original proposal — 60-line function, three nested try/catch, each catch swallows one error class; deny handling unspecified.\nRuntime evidence: unknown; the function is described but no code exists to read. \"Swallows\" is the author's own word.\nComparison grid:\n\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R4 control flow | 3 nested try/catch in one 60-line function | flat sequence of named steps (validate → decideAccess → dispatch), one error boundary | keep nesting; each catch logs and rethrows a typed error | unchanged |\n| Error disposition | each catch swallows its class silently | every failure maps to a typed AuthOutcome (ValidationFailed / Denied / DispatchFailed) returned or thrown; nothing swallowed; each logged with tenant + reason | logged and rethrown as typed errors; still three boundaries | swallowed |\n| Deny path from decideAccess | unspecified | Denied is an explicit typed outcome the caller must handle | unspecified | unspecified |\n| R2, R3 | approved / pending | fixed | fixed | fixed |\n\nQuestion D4:\nD4 — How should validateAndDispatch() handle the three error classes it currently swallows?\nProject/branch/task: main — Multi-tenant Auth Refactor; AuthBroker.validateAndDispatch() is the request-path entry point that calls decideAccess() between validation and dispatch.\nELI10: Today the function is 60 lines with a try/catch inside a try/catch inside a try/catch, and each one quietly eats a different kind of error. When something goes wrong at 3am, the request either fails with no log line or, worse, continues as if nothing happened. A flat sequence of three named steps with one error boundary at the end turns every failure into a named result (validation failed, access denied, dispatch failed) that gets logged with the tenant and reason and handed back to the caller. It also forces the plan to say what happens when the access decision is \"deny\", which it currently does not.\nStakes if we pick wrong: Silent auth failures that are impossible to debug from logs, and a deny path whose behavior is whatever the first implementer happens to write.\nRecommendation: A because a refactor is the moment to fix structure, swallowing auth errors is a security-grade bug not a style issue, and the flat form is shorter than what it replaces.\nCompleteness: A=10/10, B=7/10, C=0/10\nPros / cons:\nA) Flat pipeline with one boundary and typed outcomes (recommended) (human: ~1 day / CC: ~15 min)\n  ✅ Every failure class becomes a named, logged outcome; nothing is swallowed and Denied is explicit\n  ✅ Each step (validate, decideAccess, dispatch) is independently unit-testable; the function shrinks well under 60 lines\n  ✅ Matches \"explicit over clever\": the caller sees exactly one result type to handle\n  ❌ Callers of validateAndDispatch() must be updated to handle the typed outcome instead of relying on silent success\nB) Keep nesting, log and rethrow typed errors from each catch (human: ~3h / CC: ~8 min)\n  ✅ Smaller structural change; stops the swallowing with three log-and-rethrow edits\n  ✅ Callers see typed errors without a signature change\n  ❌ Still three boundaries in one 60-line function; the nesting that made the bugs hard to see stays\n  ❌ Deny handling is still unspecified\nC) Leave as is (human: ~0 / CC: ~0)\n  ✅ No risk of changing observable behavior during the refactor\n  ✅ Zero effort\n  ❌ Ships known silent error swallowing in the auth path; the refactor preserves the worst part of the code it reorganizes\nNet: You are trading a caller-signature update for auth failures that are visible, typed and tested; B stops the bleeding without fixing the structure; C keeps a known bug.\nHeader: Error handling\nOptions:\nA) Flat pipeline, typed outcomes (recommended)\nvalidateAndDispatch() becomes a flat sequence of named steps (validate → decideAccess → dispatch) with one error boundary. Every failure maps to a typed outcome (ValidationFailed / Denied / DispatchFailed), each logged with tenant and reason; nothing swallowed. Callers updated to handle the outcome. Completeness 10/10. human: ~1 day / CC: ~15 min.\nB) Keep nesting, log + rethrow typed errors\nKeep the three try/catch blocks; each catch logs with tenant and reason and rethrows a typed error instead of swallowing. Deny handling still unspecified. Completeness 7/10. human: ~3h / CC: ~8 min.\nC) Leave as is\nPreserve the 60-line nested structure and the swallowing catches. Completeness 0/10. human: ~0 / CC: ~0.\n\nState: approved\nActual answer: A — \"Flat pipeline, typed outcomes\" (D4 answer, this session)\nAccepted scope: validateAndDispatch() is a flat sequence of named steps (validate → decideAccess → dispatch) with one error boundary. Every failure maps to a typed outcome (ValidationFailed / Denied / DispatchFailed), each logged with tenant ID and reason; no catch swallows. Callers of validateAndDispatch() are updated to handle the typed outcome. This is an intentional behavior difference from legacyAuthFlow() and must be listed as such in the regression contract (R5).\nHistory: none.\n\n### R5: Regression contract for the legacyAuthFlow() rewrite (IRON RULE)\nFinding: T1, P1 (CRITICAL), confidence 9/10, PLAN.md:36-37 (\"The existing `legacyAuthFlow()` will get rewritten as part of this work; no regression test for the prior behavior is planned.\") and PLAN.md:23-25 (\"That coverage does not exercise legacyAuthFlow() or assert compatibility with its prior behavior.\"), reviewer: plan-eng-review (Test review).\nPlan baseline: original proposal — no regression coverage; new-component tests only.\nRuntime evidence: unknown; legacyAuthFlow()'s callers and current observable behavior are not in the repository. The rewrite is a regression risk, not an observed regression.\nComparison grid:\n\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| Behavior to preserve | unstated | full fixture matrix: valid token; expired; revoked; wrong issuer; wrong audience; suspended tenant; policy-version mismatch; IDP timeout; IDP 5xx; malformed token; deny decision; cache hit vs miss | happy path + the three error classes validateAndDispatch() catches | as A |\n| Intentional differences | unstated | enumerated: typed outcomes instead of swallowed errors (D4 → A); anything else must be added to the list before merge | same list | same list |\n| Acceptance assertions | none | for every fixture: same outcome (allow / deny / error class), same cache writes (keys and values via fake adapter), same IDP call set, except listed differences; legacyAuthFlow() deleted only when the suite is green against both | same, over the reduced matrix | as A plus 7-day production shadow run diffing legacy vs new outcomes before cutover |\n| Where it runs | n/a | unit-level parity suite over both implementations plus one [→E2E] path through the real entry point with a fake IDP | unit-level only | as A plus production shadow |\n| R2, R3, R4 | approved / pending / approved | fixed | fixed | fixed |\n\nQuestion D5:\nD5 — How do we prove the rewrite of legacyAuthFlow() keeps the behavior users rely on?\nProject/branch/task: main — Multi-tenant Auth Refactor; legacyAuthFlow() is being replaced by AuthBroker.validateAndDispatch() (D1 → B, D4 → A).\nELI10: The plan rewrites the function that decides whether every request is allowed in, and it plans zero tests that compare the new version to the old one. The new component tests only prove the new code does what the new code's author thinks it should. A characterization suite runs the same set of inputs (good token, expired token, revoked token, wrong tenant, suspended tenant, IDP down, and so on) through both the old and the new code and asserts they agree, except for the differences we chose on purpose. Only when that suite is green does the old function get deleted.\nStakes if we pick wrong: A tenant that could log in yesterday cannot today, or worse, one that should be blocked gets in, and there is no test that would have caught either.\nRecommendation: A because the input space for auth is small and enumerable, a fake adapter and fake IDP make the full matrix cheap, and anything less leaves a named blind spot in the login path.\nCompleteness: A=10/10, B=7/10, C=10/10 (C adds a production step, not more test coverage)\nPros / cons:\nA) Full characterization matrix over both implementations, then delete legacy (recommended) (human: ~2 days / CC: ~30 min)\n  ✅ Every observable outcome (allow / deny / error class), cache write and IDP call set is asserted identical except the enumerated intentional differences\n  ✅ Includes one end-to-end path through the real entry point with a fake IDP, so wiring bugs surface, not just unit logic\n  ✅ Legacy code is deleted with evidence rather than hope; intentional differences are written down where a reviewer can challenge them\n  ❌ Requires building fixtures for the full matrix before the rewrite starts (make-change-easy-first ordering)\nB) Parity on happy path plus the three caught error classes (human: ~1 day / CC: ~15 min)\n  ✅ Covers the paths the plan already names, with the same both-implementations assertion style\n  ✅ Faster to write; still forces the intentional-differences list\n  ❌ Expired, revoked, wrong-audience, suspended-tenant and IDP-outage paths are unasserted; those are exactly the security-relevant edges\n  ❌ A green suite would still allow a regression on any unlisted path\nC) A plus a 7-day production shadow run before cutover (human: ~1 week / CC: ~45 min + calendar time)\n  ✅ Catches real-traffic shapes no fixture author thought of\n  ✅ Cutover is a flag flip with data behind it, so rollback is trivial\n  ❌ Requires running both flows in production and a diff pipeline; adds a week and operational load to a refactor\n  ❌ Shadowing an auth path doubles IDP calls per request for the shadow period\nNet: You are trading two days of fixture work for a rewrite of the login path that is proven equivalent; B leaves the security edges untested; C buys extra certainty with a week of production plumbing.\nHeader: Regression\nOptions:\nA) Full characterization matrix (recommended)\nBuild fixtures for the full matrix (valid, expired, revoked, wrong issuer, wrong audience, suspended tenant, policy-version mismatch, IDP timeout, IDP 5xx, malformed token, deny decision, cache hit/miss). Assert identical outcome, cache writes and IDP call set for legacyAuthFlow() and validateAndDispatch(), except the enumerated intentional differences (typed outcomes per D4). One E2E path through the real entry point with a fake IDP. Delete legacy only when green. Completeness 10/10. human: ~2 days / CC: ~30 min.\nB) Happy path + three error classes\nSame both-implementations assertion style over the happy path and the three error classes validateAndDispatch() currently catches. Security edges (expired, revoked, wrong audience, suspended, IDP outage) unasserted. Completeness 7/10. human: ~1 day / CC: ~15 min.\nC) Full matrix + production shadow\nEverything in A, plus run legacy and new side by side in production for 7 days behind a flag, diffing outcomes, before cutover. Completeness 10/10 plus an operational step. human: ~1 week / CC: ~45 min + calendar time.\n\nState: approved\nActual answer: A — \"Full characterization matrix\" (D5 answer, this session)\nAccepted scope: Regression contract. (1) Behavior to preserve: for every fixture in the matrix (valid token; expired; revoked; wrong issuer; wrong audience; suspended tenant; policy-version mismatch; IDP timeout; IDP 5xx; malformed token; deny decision; cache hit; cache miss) legacyAuthFlow() and AuthBroker.validateAndDispatch() produce the same outcome class (allow / deny / error class), the same cache writes (keys and values observed through a fake adapter) and the same IDP call set. (2) Intentional differences: typed outcomes (ValidationFailed / Denied / DispatchFailed) instead of swallowed errors (D4 → A); any further difference must be added to this list before merge. (3) Acceptance: the parity suite is green against both implementations, plus one E2E path through the real entry point with a fake IDP; legacyAuthFlow() is deleted only after that. Fixtures are built before the rewrite starts.\nHistory: none.\n",
    "### Worktree parallelization strategy\n| Step | Modules touched | Depends on |\n|---|---|---|\n| S0 R3 probe + write SessionMint contract (A5) | read-only: cache adapter, legacy flow | — |\n| S1 Parity fixtures + fake adapter + fake IDP | test/ | S0 |\n| S2 `decideAccess()` module + table tests | auth/policy/ | — |\n| S3 `AuthBroker` (flat pipeline, typed outcomes) + unit tests | auth/broker/ | S1, S2 |\n| S4 `SessionMint` + unit tests | auth/session/ | S0, S1 |\n| S5 Composition root wiring + wiring test; update callers to typed outcomes | app bootstrap, callers | S3, S4 |\n| S6 Parity suite green against both; E2E; delete `legacyAuthFlow()` | test/, legacy module | S5 |\n\nLanes: `Lane A: S0 → S1 → S3 → S5 → S6 (sequential, shared test/ and bootstrap)` / `Lane B: S2 (independent)` / `Lane C: S4 (after S0, S1; independent of S3)`.\nExecution: launch A and B in parallel worktrees; C starts once A finishes S1. Merge B and C before S5. Conflict flag: S3 and S4 both add to `auth/`; keep them in separate subdirectories to avoid merge conflicts.\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.\n\n- [ ] **T1 (P1, human: ~2h / CC: ~10min)** — cache adapter — Probe write-after-invalidation semantics; record file:line quotes in this plan; if unguarded, raise a new decision for a recheck-before-write guard\n  - Surfaced by: Architecture — A2 (D3 → A)\n  - Files: cache adapter module, its invalidation hooks (read-only)\n  - Verify: plan section \"Amendment (D3 → A)\" filled in with quotes and a guarded/unguarded verdict\n- [ ] **T2 (P1, human: ~1h / CC: ~5min)** — plan — Write `SessionMint`'s contract: inputs, outputs, which cache entries it writes and when, typed error path\n  - Surfaced by: Architecture — A5 / Code Quality — Q3\n  - Files: this plan\n  - Verify: contract section present before S4 starts\n- [ ] **T3 (P1, human: ~2 days / CC: ~30min)** — test/ — Build the parity fixture matrix, fake adapter and fake IDP; run against `legacyAuthFlow()` to capture golden values\n  - Surfaced by: Test review — T1 (D5 → A)\n  - Files: test/ (new), fixtures\n  - Verify: parity suite green against legacy alone\n- [ ] **T4 (P1, human: ~half day / CC: ~10min)** — auth/policy — Implement `decideAccess(claims, ctx): Allow | Deny` as a pure function with table-driven tests\n  - Surfaced by: Scope — S4 (D1 → B); Test — R6\n  - Files: auth/policy module + test\n  - Verify: table tests pass; no imports of cache or IDP in the module\n- [ ] **T5 (P1, human: ~1 day / CC: ~15min)** — auth/broker — Implement `AuthBroker.validateAndDispatch()` as a flat validate → decideAccess → dispatch pipeline with one boundary and typed outcomes, logged with tenant + reason; constructor takes the adapter\n  - Surfaced by: Code Quality — Q1 (D4 → A); Architecture — A1 (D2 → A), A3\n  - Files: auth/broker module + tests\n  - Verify: one test per outcome asserts log fields; no catch swallows\n- [ ] **T6 (P1, human: ~1 day / CC: ~15min)** — auth/session — Implement `SessionMint` per its written contract; constructor takes the adapter; unit tests for success and adapter-failure paths\n  - Surfaced by: Architecture — A5; Test — R6\n  - Files: auth/session module + tests\n  - Verify: fake-adapter tests pass\n- [ ] **T7 (P1, human: ~2h / CC: ~5min)** — app bootstrap — Construct exactly one adapter in the composition root and pass it to both services; remove any module-level export; update `validateAndDispatch()` callers to handle typed outcomes\n  - Surfaced by: Architecture — A1 (D2 → A); Code Quality — Q1 (D4 → A)\n  - Files: bootstrap, callers of `validateAndDispatch()`\n  - Verify: wiring test asserts same adapter instance in both services\n- [ ] **T8 (P1, human: ~half day / CC: ~10min)** — test/ — Run the parity suite against `validateAndDispatch()`; enumerate intentional differences; add the E2E path with fake IDP; delete `legacyAuthFlow()` only when green; update or remove nearby ASCII diagrams\n  - Surfaced by: Test review — T1 (D5 → A); Code Quality — diagrams\n  - Files: test/, legacy module\n  - Verify: parity + E2E green; `legacyAuthFlow` has no remaining references\n- [ ] **T9 (P3, human: ~half day / CC: ~10min)** — auth/broker — Follow-up PR: `Promise.all` over the 5 IDP calls, after the TODO checks (T10) and independence confirmation; test concurrent dispatch + single-rejection → `ValidationFailed`\n  - Surfaced by: Performance — P1 (D6 → A)\n  - Files: auth/broker validate step + test\n  - Verify: concurrency test passes; parity suite still green\n- [ ] **T10 (P3, human: ~1h / CC: ~5min)** — IDP client — Check JWKS / issuer-metadata caching and the IDP per-client rate limit before T9\n  - Surfaced by: Performance — P2, P3 (D8 → A)\n  - Files: IDP client module (read-only), plan\n  - Verify: findings recorded in the TODO / follow-up PR description\n\nEffort assumptions: tests ~50x, features ~30x, architecture/probe ~5-10x human ÷ CC.\n",
    "## GSTACK REVIEW REPORT\n\nCommit: 8636c2b (tree clean) | Branch: main | Plan: Multi-tenant Auth Refactor | 2026-09-16\n\n| Review | Runs | Last run | Status | Findings |\n|---|---|---|---|---|\n| CEO Review (`/plan-ceo-review`) | 0 | — | not run | — |\n| Outside Review (`codex`) | 1 | 2026-09-16T13:51:50Z | disabled / skipped | no findings |\n| Eng Review (`/plan-eng-review`) | 1 | 2026-09-16T13:57:53Z | ISSUES OPEN (mode: SCOPE_REDUCED) | 13 issues, 1 critical gaps |\n| Design Review (`/design-review`) | 0 | — | not run | — |\n| DX Review (`/dx-review`) | 0 | — | not run | — |\n\n**OUTSIDE COVERAGE:** provider `codex`, phase plan-review, status disabled — no outside findings were obtained; re-enable with `gstack-config set codex_reviews enabled` and rerun for a second opinion.\n\n**VERDICT:** Not clear — eng review required. 12 of 13 findings are resolved by accepted amendments (D1–D8); implementation may begin with T1 (adapter probe) and T2 (SessionMint contract), but the plan is not fully approved until the R3 guard question is answered.\n\n**UNRESOLVED DECISIONS:**\n- R3 guard remedy — recheck-before-write guard for the cache adapter, conditional on the pre-implementation probe (D3 → Investigate). If the adapter accepts writes after invalidation unguarded, raise a new D-numbered decision (guard yes/no and its form) before T5/T6 start."
  ]
}