gstack/docs/pregate.md

The pre-gate: generated files, cheap checks, issue links

/ship Step 5 opens with gstack-pregate: the free checks that catch what the multi-agent wave kept paying remote gates to find (stale generated files, a scratch script at the repo root, a nightly-only test still asserting an old constant, a Windows-only change merged with its lane unrun, a | tail-hidden failure). Plan: docs/designs/MULTI_AGENT_WAVE_2026_10_10.md C4, C6, C8. Result codes: docs/troubleshooting.md.

Three bins, all over lib/:

Bin	Pin file (read from origin/<base>)	Does
gstack-regen	.gstack/generated.json	generated files regenerate, never hand-merge
gstack-pregate	.gstack/pregate.json	two-stage cheap gate, pregate.json record, publication check
gstack-issue-links	—	Fixes #N only on explicit closure intent; Related PRs and validated flake issues

Trust boundary

A pin file names commands. Its presence never authorizes execution: both tools read the committed copy on origin/<base> (a PR cannot smuggle a command into its own gate; gstack-pregate run alone also reads a user-owned file outside the repository when the base has none, see pregate v1) and run commands only with --allow-repo-commands, which /ship passes. Standalone, gstack-regen check lists the commands and exits 3 (REPO_COMMANDS_NOT_ALLOWED); gstack-pregate marks regen and lanes incomplete, never pass. --policy-from head (a PR that introduces or changes a pin file) is accepted only with --allow-repo-commands and the record says policy head (unreviewed). An unresolvable base exits 3 with POLICY_SOURCE_UNAVAILABLE. Globs are repo-relative (no .., no absolute paths, at most 64 per list); commands are one line under 512 bytes.

.gstack/generated.json (generated-v1)

{ "$schema": "https://github.com/garrytan/gstack/docs/pregate.md#generated-v1",
  "entries": [ { "id": "skill-docs", "command": "bun run gen:skill-docs --host all",
                 "outputs": ["*/SKILL.md", "*/sections/*.md"], "inputs": ["*/SKILL.md.tmpl", "hosts/**"] } ] }

• gstack-regen check regenerates every entry (or --only <id>, or --touched <paths> for entries whose inputs or outputs intersect) in a scratch git worktree seeded from the working tree, with node_modules linked rather than copied, and reports stale outputs (REGEN_STALE, exit 1) without touching the tree. When outputs differ but package.json declares dependencies and node_modules is missing, the entry is REGEN_DEPS_MISSING (install, then rerun) instead of stale. An entry with no command is tracked only (goldens regenerated by another entry).
• gstack-regen write regenerates in place: what gstack-restamp and the Step 3 conflict rule use. On a conflict in a registered output, take either side, then gstack-regen write; the agent never hand-merges a generated file.
• list, validate, init [--explain] [--force].

gstack's entries: skill-docs (every host render, the agents digest, llms.txt, the doctor component table) and ship-goldens (bun scripts/gen-ship-goldens.ts, the byte-pinned /ship renders in test/fixtures/golden/).

.gstack/pregate.json (pregate-v1)

Key	Meaning
runner	the local test command with {files} (gstack: bun test {files}); unset, it is detected (bun, vitest, jest, pytest, node --test, and flutter test/dart test per Dart package root, through fvm when that package or an ancestor pins it with .fvmrc or .fvm/fvm_config.json and fvm is on PATH; cargo test -p <name> per Rust crate, run from the root of the workspace the crate is a member of (Cargo's members globs, exclude and package.workspace), else the crate directory; a JS/TS test whose nearest package.json is a nested package declaring vitest or jest (a dependency or its test script) runs from that package, with package-relative paths, through the package manager its packageManager field or the nearest lockfile up to the repo root names: pnpm exec, yarn, bun x, else npx; every other JS/TS test keeps the root detection); nothing detected, a Dart SDK, cargo or package manager missing from PATH, a .dart file with no pubspec.yaml above it, a .rs file outside any crate, or one in a crate whose name Cargo would reject (anything but letters, digits, _ and -), is incomplete (the runnable groups still run, so a real failure still fails)
dependencies	glob → test files for subprocess targets, runtime reads and generated inputs the import graph cannot see; [] declares "no lane needed" (docs, licences)
empty_lanes	extra globs for the docs/no-tests empty lane. Any Markdown file already qualifies with no pin file when no test depends on it (the same import graph as other files: a quoted path, a join() of path segments, an import, or a dependencies entry). reStructuredText and AsciiDoc count as Markdown here. README, CHANGELOG, CONTRIBUTING, LICENSE, AGENTS and CLAUDE qualify even without .md, and so does licence text under any vendored name (roboto-LICENSE.txt, LICENSE-MIT, licenses/*.txt). Source code and files under a test directory never qualify. A test that reads the file still selects that test
selection	workflow.yml/job → a command printing the lane's file list, for matrices a planner computes (gstack: scripts/test-free-shards.ts --list)
warn	check ids downgraded to warn; secrets and required lanes never
strays.allow	intentional root files or new top-level directories
local	workflow.yml/job lanes a local run satisfies: a platform-agnostic toolchain (an ubuntu-latest suite that runs the same on a Mac), or a repo whose CI is off. Their tests run here instead of becoming requires-remote, except that on a machine under 8 cores with a remote_gate or a remote test_backend the small-machine rule still records the test tier as a requires-remote obligation. --explain notes an id that matches no workflow lane
guards	[{ id, when: [globs], command, fix?, timeout_s? }]: repo commands a lane must pass when a touched file matches when (manifest checks, subprocess goldens the import graph cannot see); see guards
serial_patterns	test-file globs the lanes check runs one process per file, apart from the unit files (default **/*.serial.test.*)
sealed	sealed or eval output that must never reach a public destination; read by the pre-push hook and gstack-pregate sealed (see sealed output)
price_file	repo-relative path of the paid gate's call-plan data file (GSTACK_EVAL_CALLS v1); gstack-eval-plan price-gate prices from it and never executes anything (docs/eval-calls.md)
stall_timeout_s	seconds a test command may print nothing before its process group is killed and the check is incomplete (PREGATE_STALLED); default 300, 0 disables; --stall-timeout overrides (see supervision)
remote_gate	the repo's remote test gate command; under 8 cores the local test tier becomes a requires-remote obligation naming it, and --remote runs it (see remote gate)

Only the origin/<base> copy or the user-owned file below is honoured, so a downgrade is reviewed (or is the user's own) before it takes effect. A repo that keeps .gstack/ out of git (a shared repo where gstack is one contributor's tool) can hold the same file at <state root>/projects/<slug>/pregate.json. The state root is GSTACK_STATE_ROOT, else GSTACK_HOME, else GSTACK_STATE_DIR, else a gstack plugin's data directory, else ~/.gstack (docs/state-root.md); <slug> is what ~/.claude/skills/gstack/bin/gstack-slug prints as SLUG= in the repository (GSTACK_PROJECT_SLUG overrides it). It is read only when the base carries none (never under --policy-from head), it lives outside the repository so a PR still cannot reach it, and the record names it (policy user <path>) and fingerprints its bytes (policy_digest, and each check's inputs.policy); verify and the ship receipt treat an edited or deleted user file, or one that appears (or a link on its path that starts pointing nowhere) after a run under the defaults, as PREGATE_STALE. A path that is relative, resolves inside the repository, or reaches it through any symlink on the way (a state root linked into the checkout, or a link hop inside it, even when the last hop points back outside) is ignored, since a PR could commit it or choose the file; --explain says so, or says (absent) when no file is there. The slug and state root come from the caller's environment, never the checkout's .env: the bin's shebang passes --no-env-file, and a bare bun gstack-pregate launched beside any .env file refuses (POLICY_SOURCE_UNAVAILABLE). verify reads both paths from the record, not from its own environment. It covers gstack-pregate run only: sealed and price_file are read from the base branch's copy, so the user file refuses them (PREGATE_CONFIG_INVALID) rather than holding a policy nothing reads. A user file that exists but cannot be read, or a symlink on its path that points nowhere, refuses the same way instead of falling back to defaults. A base copy git cannot read (and git ls-tree cannot confirm is absent) refuses with POLICY_SOURCE_UNAVAILABLE instead of handing the run to the user file. gstack-pregate validate / init cover the working-tree file.

gstack-pregate init writes a draft built from the repo, not a fixed example. It prints the languages it found and the runner each language's tests would get, then maps every file the import graph cannot place to the tests of the nearest directory above it that holds at most 25 of them, up to the 256-entry schema limit. The draft never writes [], which would clear a file without a test. A file with no nearby test, and a lane whose matrix a planner computes, is printed as a TODO. Review each entry before committing the file on the base branch.

gstack-pregate

gstack-pregate [--stage preflight|tests|all] [--only <check,..>] [--allow-repo-commands] [--policy-from base|head]
               [--timeout <s>] [--stall-timeout <s>] [--remote --spend-cap <usd>] [--explain] [--json]
gstack-pregate verify | clear --remote <workflow.yml/job> --run-url <url> | lanes | validate | init

Two stages with separate clocks, both printed:

Stage 1, mechanical preflight (the two-minute promise; gstack measured ~2.5 s for regen and under 200 ms for each of the others):

• regen: every registry entry whose inputs or outputs are touched is fresh (gstack-regen check in a scratch worktree).

• secrets: gstack-redact over the branch's added lines (merge-base to the working tree, untracked files included). HIGH, or MEDIUM in the secret category, fails; other MEDIUM findings warn. Cannot be downgraded.

• strays: a new file at the repository root, a new top-level directory, or a scratch name (zz-*, tmp*, scratch*) anywhere.

• literals: for every changed exported constant or named timeout/retry literal, the whole test tree (nightly- and Heavy-only files included) is searched for the old value; a consumer the branch did not update fails with file:line.

• timing: added or changed test lines that compare an elapsed wall-clock or CPU time against a bound, or sleep and then assert, print TIMING_ASSERTION: <file>:<line> <pattern> and a TIMING_ASSERTIONS: found=<n> escaped=<n> files=<n> summary. It warns (PREGATE_TIMING_ASSERTION); it does not block. See timing.

• guards: each guard in the active policy (.gstack/pregate.json, or the user-owned file) whose when globs match a touched file (renames included) runs its command in its own process, under the verified launch Bun, with its own timeout_s (default --timeout). A non-zero exit fails pregate naming the guard and its fix (PREGATE_GUARD_FAILED); a timeout is incomplete; without --allow-repo-commands the selected guards are listed and the check is incomplete. Guards are read from the base branch's copy (or the user-owned file when the base carries none) and cannot be downgraded to warn. See guards.

Stage 2, test execution:

• lanes: touched files map to tests through lib/pregate/import-graph.ts (static imports ∪ repo-path string literals ∪ the bin/<name> → test/<name>*.test.ts convention ∪ dependencies; Dart import/export/part directives resolve package:<name>/x through every tracked pubspec.yaml, and *_test.dart files under a test/ directory are tests, except under integration_test/ and test_driver/: they need a device, so pregate never runs them, and a touched one has no lane until you declare "**/integration_test/**": [] (and "**/test_driver/**": []) under dependencies and let CI run them; Dart files, device tests included, are source code, so a dependencies [] declaration clears them and empty_lanes does not); in a Rust crate (the nearest Cargo.toml with a [package] name) a .rs file is a test when it sits under <crate>/tests/, holds a #[cfg(test)] (any cfg predicate naming test) or a test attribute (#[test], #[tokio::test]), and every .rs file of the crate and its Cargo.toml select the crate's tests and those of every crate whose manifest depends on it, directly or through other crates (cargo runs a crate's tests, not a file, so the lane is the crate; a crate with no tests still has no lane, and a workspace-only Cargo.toml or Cargo.lock needs a dependencies entry), transitively through non-test files; deleted and renamed files select the tests that named them. An extensionless JS/TS import (relative, a tsconfig/jsconfig paths alias or baseUrl) tries the exact path, then .ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, then index.ts, index.tsx, index.js, index.jsx and index.mjs inside the directory; the first file that exists wins. A touched source file with no lane is FAIL lanes — <file> has no test lane, never a pass. Markdown that no test depends on is a docs/no-tests empty lane instead (docs/no-tests: N documentation file(s)), including when the base branch has no .gstack/pregate.json. The dependency is the same import graph as every other file, so a test that reads the Markdown (a fixture or a doc) still selects that test. empty_lanes adds globs for other documentation; it cannot clear a source file or a file under a test directory. Files no test runner loads take a second empty lane by the same rule (no-tests (assets and tool config): …): images, fonts, media and PDFs outside snapshot, golden and fixture directories, plus an allowlist of tool configuration (.editorconfig, .gitignore, .pre-commit-config.yaml, lint and format config, .vscode/, .idea/, .impeccable/, and GitHub issue templates, CODEOWNERS and dependabot config). Stylesheets (they import each other), any other dotfile (.rspec, .husky/ hooks, .env*, version pins), CI workflows and actions, and .gstack/ still need a lane. In a Django project (a manage.py or code importing django, plus Python code, not a string or comment, that assigns INSTALLED_APPS or ROOT_URLCONF, or a config file names DJANGO_SETTINGS_MODULE), the files Django loads by name get framework edges: every Python test depends on each settings module; a dotted string in a settings module and an include("app.urls") argument count as imports; an app's migrations, admin.py, templates/, static/, templatetags/, management/, fixtures/ and locale/ files select that app's tests and the tests that reach its models.py (the settings module, so the suite, when the app has no tests of its own); a template under a project-level templates/ directory selects the suite through the settings module. Lanes and platform tiers come from .github/workflows/*.yml (gstack-pregate lanes prints them; a test path a step names resolves against that step's working-directory, else the job's or workflow's defaults.run.working-directory): local ones run through the runner under set -o pipefail, judged on the runner's summary line (zero tests ran is a failure, a | tail-hidden exit is still an exit; cargo's test result: lines, one per test binary and doc-tests included, are summed); a platform lane this machine cannot run becomes a requires-remote obligation naming workflow.yml/job, unless local names that lane. --explain prints each test's provenance and every uncertain mapping (a planner-computed matrix without a selection manifest selects conservatively). Test files matching serial_patterns (default **/*.serial.test.*) run one process per file after the unit files. The runner and every guard run with the verified launch Bun first on PATH: the first of $BUN_INSTALL/bin and ~/.bun/bin whose Bun satisfies gstack's and the project's engines.bun (the row prints runtime: bun <v> from <dir>), so a Capy host's older image Bun cannot flip the verdict.
• Every test-tier command (the lanes runner, each guard, the --remote gate) runs supervised: see supervision. --timeout bounds each runner process (the unit-file group, each serial file, each guard without its own timeout_s), not their total; the stall timeout catches a hung or silent one sooner.
• Under 8 cores, a remote_gate in the active policy or a remote test_backend (gstack-config set test_backend ubicloud) records the local test tier as a requires-remote obligation instead of running it: see remote gate.

Every check records the input identity it ran against (the working-tree fingerprint before and after, the selection, the command hash); a tree that moved during a check, a timeout or a missing tool is incomplete, never pass. The record is .gstack/tmp/pregate.json (gstack-artifact validate --as pregate).

Publication. gstack-ship-receipt write --pregate .gstack/tmp/pregate.json (Step 18) refuses unless the record is current for the tree being published (PREGATE_STALE: rerun after the final stamp), green (PREGATE_LANE_FAILED, PREGATE_INCOMPLETE) and every requires-remote obligation carries a receipt (PREGATE_REMOTE_UNCLEARED: dispatch the job, then gstack-pregate clear --remote <workflow.yml/job> --run-url <url>). The ship receipt then carries pregate and requires_remote. gstack-pregate verify runs the same check standalone.

Unknown flags exit 2 with usage on every verb (an agent told to run a flag this gstack lacks never gets a green it did not ask for). Tier 2 checks still to come (ratchets, lint, links, hermetic, patches, integrator) are named in --only's help.

Supervision: progress, stalls, deadlines

GBRA-95 (gbrain, 4 cores): a core edit selected 3,683 local files, 358 of them serial; the test stage printed nothing for 90 minutes: each runner process ran up to its own --timeout (one per serial file) with its output buffered until it returned, and nothing noticed a process that had gone quiet. Now each test-tier command:

• runs in its own process group (setsid), with stdout and stderr appended to a log file, never a pipe, so a backgrounded grandchild that keeps the output open cannot hold the check; after the command exits, the group's leftover members are killed;
• reports live on stderr (stdout stays the table, or one JSON document with --json):

  PREGATE_TEST: <n>/<total> <file> start
  PREGATE_TEST: <n>/<total> <file> pass|fail <seconds>
  PREGATE_HEARTBEAT: <label> running <s>s; last file <file>; log <bytes> bytes, last growth <s>s ago (<log>)
  PREGATE: tests <verdict> in <s>s — lanes: <detail>
  

  Per-file lines come from a progress adapter where the runner's reporter provides them: bun test (its <file>: headers) is the only adapter today; a one-file run (each serial file) reports its file from the launch for any runner. Other runners (node --test, vitest, jest, pytest, flutter test, dart test, cargo test) get heartbeats only. A heartbeat follows each 60 s with no progress line;
• is killed as stalled when its log does not grow for the stall timeout (--stall-timeout <s>, else stall_timeout_s, else 300; 0 disables): the check is incomplete with PREGATE_STALLED and names the last file started; the next serial file still runs;
• is killed as timed out when that runner process reaches --timeout (per runner process, so many serial files that each fit still pass); the check is incomplete and the next serial file still runs.

A kill is SIGTERM to the group, then SIGKILL after 5 s (a group that ignores SIGTERM still dies). SIGINT or SIGTERM to gstack-pregate itself SIGKILLs every running group, writes no pregate.json and exits 130 or 143. Windows has no process groups here: the kill is taskkill /T /F on the shell's tree, which misses a descendant that was reparented or started detached.

Small machines and the remote gate

Under 8 cores (os.availableParallelism()), when the active policy (the base branch's .gstack/pregate.json, or the user-owned file) declares remote_gate or gstack-config get test_backend is not local, the lanes check runs nothing locally: it records the selected local files as a requires-remote obligation with the command to run, pregate.json/remote_gate (the declared command) or test_backend/<backend> (gstack's scripts/ubicloud/ubi-runner.sh run --src <repo> -- '<runner> <files>'). Without either, the tier runs locally under the supervision above. Close the obligation one of two ways:

• after running it, gstack-pregate clear --remote pregate.json/remote_gate --receipt <file> with the gate's output, validated as --remote validates it (a run URL is refused, PREGATE_RECEIPT_INVALID for a bad receipt), or gstack-pregate clear --remote test_backend/<backend> --run-url <url>, which has no machine-checkable receipt and is recorded as attested:<url>; or
• gstack-pregate --stage tests --remote --spend-cap <usd> --allow-repo-commands, which runs the declared remote_gate now (never under --policy-from head; a test_backend without remote_gate cannot be run this way). The gate runs in the repository root with PREGATE_TREE (the working-tree fingerprint being tested), PREGATE_FILES_FILE (the selected files, one per line) and PREGATE_SPEND_CAP_USD, and must print PREGATE_REMOTE: tree=<tree> tests=<n> failed=<n> [spent=<usd>], reporting the tree it actually tested. The obligation clears only when that tree is PREGATE_TREE, tests > 0, failed = 0 and the gate exits 0; anything else leaves it uncleared and the check incomplete. The cap defaults to $GSTACK_SPEND_CAP_USD; there is no default spend. Spend prints as spent, reserved, unknown: a gate that prints no spent= is unknown, counted at the cap.

gstack's own example: .gstack/pregate.json declares "remote_gate": "bash scripts/ubicloud/pregate-remote.sh". With UBICLOUD_API_KEY set the script runs the selected files on one Ubicloud VM with bun run test:ubicloud's environment, refuses before creating the VM when the cap cannot buy a 20-minute run at the size's list price (UBI_SIZE, default standard-16), checks the tree and the planned file set on the VM before any test runs, and reports spent= from billed minutes. Without a key it runs the same files locally in parallel shards (test-free-shards.ts --files-from) and reports spent=0, after a backend=local (N cores; not the CI environment) line. Paid test files in the selection (skill-e2e and the other paid globs in test/helpers/paid-test-set.ts) are named and left to the paid PR gate; a selection of only paid files reports tests=0, which never clears the obligation. The command is the same either way (--remote always needs a cap; the keyless path spends nothing).

pregate kills the gate at its --timeout (default 600 s) with a 5 s grace, so the script finishes before that deadline: it reads the deadline from PREGATE_TIMEOUT_S, else from the gstack-pregate command it runs under (its --timeout, else 600), reserves 120 s for teardown plus 15 s margin, and tells the VM to stop at whichever comes first, that point or the cap's wall (at most 45 minutes, minus 3 for teardown). A deadline that leaves the VM under 300 s refuses before any VM (PREGATE_REMOTE_TIMEOUT_TOO_SHORT). At create time it prints the VM's name and the exact bash scripts/ubicloud/ubi-runner.sh down <name> line to destroy it if the run is killed before its teardown line. The whole script is parsed before it runs, so editing it during a run changes nothing. --timeout 2700 gives a whole-tier run room inside the 45-minute wall:

gstack-pregate --stage tests --remote --spend-cap 2 --timeout 2700 --allow-repo-commands

Measured (October 2026): keyed, all 1,280 free files on standard-16 took 404 s from start to teardown (create 24 s, setup 72 s, tests 250 s) for $0.06. Keyless on 4 cores, 98 files took 103 s, and GSTA-35's 798-file selection took 3,550 s, so keyless is practical for small selections only. A large selection on a small machine needs a key, or a --timeout longer than the run. Keyless also runs in your environment, not CI's: a file that needs what setup-free-suite.sh installs (Playwright's Chromium, Xvfb) fails locally until you install it.

Every refusal line starts with a reason code:

code	exit	meaning
PREGATE_REMOTE_USAGE	2	an input is missing or malformed; run it through gstack-pregate --stage tests --remote
PREGATE_REMOTE_TREE_MISMATCH	3	the working tree is not PREGATE_TREE; nothing uploaded, nothing spent
PREGATE_REMOTE_TREE_MOVED	3	the tree changed during the run (the moved paths are listed); no result reported
PREGATE_REMOTE_VM_TREE	3	the VM's unpacked tree or planned file set differs from what was checked locally
PREGATE_REMOTE_NO_RESULT	1	test-free-shards printed no result (a rejected file list)
PREGATE_REMOTE_PAID_ONLY	0	every selected file is a paid test file; tests=0 cannot clear
PREGATE_REMOTE_CAP_TOO_LOW	5	the cap cannot buy a 20-minute run at the size's price; nothing created
PREGATE_REMOTE_NO_PRICE	5	UBI_SIZE has no list price in the script
PREGATE_REMOTE_TIMEOUT_TOO_SHORT	5	pregate's deadline leaves the VM under 300 s after the 135 s teardown reserve; nothing created
PREGATE_REMOTE_INFRA	4	create, setup, SSH or the stop deadline failed; the VM, its teardown line and spent= follow
PREGATE_REMOTE_INTERRUPTED	130	TERM or INT; ubi-runner tears the VM down on its own

Guards and the lane-done rule

A lane runs gstack-pregate run --allow-repo-commands on its branch before it reports done, and its handoff carries the PREGATE: line (the coordinator contract says so word for word). The unit tier covers the changed files' tests; guards cover the repo's mechanical gates the import graph cannot see:

{ "guards": [
    { "id": "serial-manifest", "when": ["test/**/*.serial.test.ts", "scripts/serial-files.tsv"],
      "command": "bun test test/scripts/serial-files.test.ts",
      "fix": "add the file's row to scripts/serial-files.tsv" } ] }

dependencies still maps globs to extra tests the lanes check selects; a guard is a command with its own fix line. Older gstack refuses unknown keys (PREGATE_CONFIG_INVALID), so a repo commits guards only after the gstack that reads them ships. The worked gbrain configuration is in gbrain worked configs.

Timing assertions

timing reads only the lines the branch added or changed in test code (test files and files under test/, tests/, spec/ or __tests__/; never fixture trees). It reports three patterns:

Pattern	Example
wall-time-bound	expect(Date.now() - t0).toBeLessThan(400), expect(elapsedMs).toBeLessThanOrEqual(2_000), assert elapsed < 0.5
cpu-time-bound	expect(cpuMs(() => parse(x))).toBeLessThan(150), assert time.process_time() - c0 < 0.2
sleep-then-assert	await Bun.sleep(50); expect(calls).toBe(1) (a fixed sleep, not a polling loop)

A comparison with 0, a named bound (timeoutMs, TTL_MS), a timestamp ordered against a bare Date.now() and a while (… Date.now() < deadline) poll are not reported. Changing the bound of an existing assertion is a changed line, so it is reported.

Escape. When the bound is the contract (a hang check with wide headroom, a CPU-time bound on a pure function), put gstack-timing-ok: <reason> in a comment, in any comment syntax (//, #, /* */, --), on the line or the line above. The reason is required; an empty one is still reported with (gstack-timing-ok needs a reason). --explain lists every escape and its reason.

Warn, not block (measured 2026-10-16). The detector was run over:

• gstack's own test tree: 263 hits in 123 of 1,566 test files (176 wall-time-bound, 87 sleep-then-assert), mostly real timing assertions, most of them generous "does not hang" bounds.
• gstack's last 51 commits on main: 9 of the 47 that touched tests would have been flagged (29 hits; #3190 alone has 7).
• gbrain's last 100 commits on master: 37 of the 95 that touched tests would have been flagged (147 hits).
• The five gbrain timing-flake fixes (#6050, #6493, #6726, #6746, #6862): 31 of 38 fix sites were flagged before the fix. The misses are flakes with no timing comparison on the line (an injected deadline in #6050, a Promise.race with a sleep and a deadline parameter in #6862) and ratio or percentile checks computed far from the clock read. The correct fix in #6726 (wall clock to thread CPU time) is still a bound and is reported 21 times.

Blocking would stop about a fifth of gstack's and two fifths of gbrain's test-touching commits, including correct fixes, so the check warns. A repo that wants it stricter keeps the warning in its review rule (the /review checklist has the same rule) and /investigate's flake playbook says what to do with a timing flake: never raise the bound.

Sealed output: the pre-push hook and gstack-pregate sealed

{ "sealed": {
    "paths": ["heldout/**"],
    "transcripts": ["runs/**/transcript*.jsonl"],
    "answer_markers": ["SEALED ANSWER:"],
    "seed_patterns": ["shuffle_seed=\\d+"],
    "local_paths": true } }

A repo with a sealed key gets a configured local check against accidental publication whenever the managed pre-push hook (gstack-redact install-prepush-hook, no reinstall needed) or the standalone preflight runs:

gstack-pregate sealed [--range <a..b>] [--remote origin] [--base <branch>] [--json]

• Boundary. Every commit the push publishes: git rev-list <local sha> --not --remotes=<remote> (and the remote tip when the ref exists); a destination with no refs means everything reachable. --range names the commits explicitly.
• Rules. sealed.path and sealed.transcript check every path a commit adds, renames or copies, whatever its content (binary, empty, deleted again in a later commit); sealed.answer, sealed.seed and sealed.local_path (/home/<user>/, /Users/<user>/, C:\Users\<user>\) check each commit's added lines. Findings print rule, file[:line] and commit, never the text.
• Policy. The union of the destination base branch's sealed and the pushed commit's: a push can tighten it, never relax it. A malformed or unreadable policy refuses. Waivers come only from the base branch's .gstack/sealed-allow.tsv (rule<TAB>path<TAB>sha<TAB>reason) and are listed on every push.
• Visibility. sealed.visibility from the base branch, else a cache under the state root (sealed-visibility.json: a public answer for 24 hours, a private one for 1 hour before it may turn a refusal into a warning), else gh repo view --json visibility (5 s). Unknown, unreadable or newly created counts as public. Public refuses (SEALED_OUTPUT_REFUSED, exit 1); private warns.

Capy's pull-request tool may not run local git hooks, so an agent runs gstack-pregate sealed before any push or PR creation in a repo with a sealed config (the coordinator contract says so). Hosted CI on the public repository only detects a bypass after the upload.

gstack-pregate regate: does the gate still cover HEAD

gstack-pregate regate --against <gated-head> --bundle <evidence-bundle.json> [--require <lane,...>]
                      [--pr <n>] [--from <gate-ahead.json>] [--predecessor-pr <n> | --predecessor-ref <ref>]
                      [--base <branch>] [--json]
gstack-pregate --against <gated-head> ...      the same verb

It evaluates a tree receipt now (never a stored one) between the gated head and HEAD under the base branch's ship policy, so the repo's stamp_files and stamp_patterns decide what a stamp is (ship-policy). Reuse needs an evidence bundle produced on the gated tree, the same execution identity, and a predecessor head that is still the recorded one (read from --from, default .gstack/tmp/gate-ahead.json when it names this gated head). It prints each differing file (a non-stamp difference with its first line), then:

STAMP_ONLY: yes|no files=<n> [changed=<n>]
LANE: <label> reusable|rerun|not-reusable (<reason>)      one per bundle lane and per --require lane
MIGRATION_COLLISION: none (...) | unknown (...) | <id> <file> vs <origin/main|PR #n> <file>
REGATE: not-needed | needed (<every reason>)

REGATE: not-needed (exit 0) only when the tree is stamp-only, every lane in the bundle and in --require is reusable (a stamp-sensitive lane reruns, so it needs a regate), the predecessor head is known and unmoved, and the migration lookup finished with no collision. Anything else is needed (exit 1); no bundle prints REGATE: needed (no gate evidence for <head> ...).

Migrations come from the ship policy's migrations (dir, id regex with one capture group). The numbers this branch adds under dir are compared with the base branch's tree and with every other open PR (gh pr list --state open --limit 1000 --json number,headRefOid,files; the PR itself is skipped by head sha or --pr). A PR listing 100 files is truncated by GitHub, so its full list is fetched with gh api --paginate. A failed query, 1000 listed PRs or an unfetchable file list is MIGRATION_COLLISION: unknown (...), which blocks not-needed (MIGRATION_COLLISION).

gbrain worked configs

gbrain commits these on master after the gstack that reads the new keys ships (older gstack refuses unknown keys). Its .gitignore ignores .gstack/* today, so the change also adds !.gstack/pregate.json and !.gstack/ship-policy.json; both changes are gbrain's.

.gstack/pregate.json: guards for the gates the import graph cannot see.

{
  "dependencies": {
    "test/**/*.serial.test.ts": ["test/scripts/serial-files.test.ts"],
    "scripts/serial-files.tsv": ["test/scripts/serial-files.test.ts"],
    "src/cli.ts": ["test/cli-goldens.test.ts"],
    "src/commands/**": ["test/cli-goldens.test.ts"],
    "src/core/operations*.ts": ["test/cli-goldens.test.ts"]
  },
  "guards": [
    { "id": "serial-manifest", "when": ["test/**/*.serial.test.ts", "scripts/serial-files.tsv", "scripts/run-serial-tests.sh"],
      "command": "bun test test/scripts/serial-files.test.ts",
      "fix": "add the serial file's row to scripts/serial-files.tsv" },
    { "id": "cli-goldens", "when": ["src/cli.ts", "src/cli/**", "src/commands/**", "src/core/operations*.ts", "src/core/ops/**"],
      "command": "bun test --timeout=60000 test/cli-goldens.test.ts test/cli-dispatch-phase.test.ts test/export-surface-golden.test.ts",
      "fix": "bun run regen:all, then justify each changed golden in the PR body" },
    { "id": "regen-check", "when": ["src/**", "skills/**", "templates/**", "plugin/**"],
      "command": "bun scripts/regen-all.ts --check",
      "fix": "bun run regen:all and commit the regenerated files" },
    { "id": "migration-order", "when": ["src/core/schema-migrations/**"],
      "command": "bun scripts/check-schema-migration-order.ts",
      "fix": "renumber the migration to the next free number on master" }
  ]
}

.gstack/ship-policy.json: the stamp rule and migrations. On a pure restamp of a gbrain master tree from 0.60.188.0 to 0.60.189.0 the tree receipt classifies all 16 changed files as stamps under this policy; an added line in src/core/behavior-change-notice.ts stays a change.

{
  "bump": "patch",
  "queue_mode": "stamp-at-merge",
  "changelog": "CHANGELOG.md",
  "stamp_files": [
    "VERSION", "package.json", "CHANGELOG.md", "openclaw.plugin.json",
    ".claude-plugin/plugin.json", ".codex-plugin/plugin.json",
    "plugin-variants/*/.claude-plugin/plugin.json", "plugin-variants/*/.codex-plugin/plugin.json",
    "plugin-variants/*/README.md", "plugin/README.md",
    "BOOTSTRAP_FOR_AGENTS.md", "templates/bootstrap/template-repo/README.md",
    "src/core/behavior-change-notice.ts"
  ],
  "stamp_patterns": [
    "\"version\": \"{version}\"",
    "since: '{version}'",
    "<!-- gbrain-plugin-tree-stamp: {version} -->",
    "<!-- gbrain-template-stamp: {version} -->",
    "<!-- gbrain-runbook-stamp: {version} -->"
  ],
  "migrations": { "dir": "src/core/schema-migrations", "id": "^v(\\d+)-" }
}

gbrain's bun run release:restamp fetches master, picks its own version, refuses a dirty tree and commits, so it cannot be restamp_command as it stands; the stamp rule above lets gstack's own restamp writer do the work. A gbrain mode that takes the version and writes only stamps would make it one.

gbrain-evals .gstack/pregate.json: the sealed paths. The globs below are placeholders in the shape the guard reads; gbrain-evals fills in its own held-out and transcript layout.

{ "sealed": {
    "paths": ["heldout/**"],
    "transcripts": ["runs/**/transcript*.jsonl"],
    "answer_markers": ["SEALED ANSWER:"],
    "seed_patterns": ["shuffle_seed=\\d+"],
    "local_paths": true } }

gstack-issue-links

gstack-issue-links [--base <ref>] [--issue <n>]... [--ci-run <id>]... [--supersedes <pr>]... [--credit <pr>]...
                   [--no-auto-links] [--author <login>] [--repo <owner/repo>] [--out issues.json] [--json]

Reads origin/<base>..HEAD. Fixes #N only on explicit closure intent: a Fixes/Closes/Resolves #N trailer line or --issue N. A bare mention (a subject's (#N) included), a partial fix, a deferred ask and every cross-repo owner/repo#N are Refs. Same-repo references are printed as promotion candidates (reference #N ← <commit line> (promote: fix #N) on stderr, candidates in --json): the owner's fix #N reply reruns with --issue N; an unattended run keeps them Refs and lists them in the handoff. Each closure issue is read through gstack-issue-guard; one that cannot be read is Refs #N (unreadable …) with ISSUE_UNREADABLE (exit 1), never Fixes.

Each --ci-run <id> is searched among open issues whose body names it and rendered Flake: #N (run <id>) only for a bot-opened issue of this repository that names that run (its flake:json first_seen.run_id, or this repository's actions/runs/<id> URL) and a test (flake:json file › test, or a Flake: <test> title). Two issues for the same test keep the lower number; every refused match is printed with its reason.

Open PRs by other authors (not this branch, and not this PR's author: --author, else the gh viewer; when the viewer is an app such as capy-ai[bot], the HEAD commit's GitHub user, else the owner of a user-owned repository, else the gap is ISSUE_LOOKUP_FAILED) whose closing set overlaps this PR's Fixes are Related: #N (@author), read page by page from each issue's closing-PR references, in unattended runs too. Supersedes #N replaces that line and Contributed by @author is added (the credit lines of lib/contributor-mode.ts) only with --supersedes N / --credit N, after the owner confirms. --no-auto-links skips the lookup. A failed lookup prints ISSUE_LOOKUP_FAILED and keeps the other lines. The stderr preview names the source of each line.

The printed lines go under ## Issues in the PR body; --out writes the object (fixes, refs, flakes, related) gstack-ship-receipt write --issues @file embeds. With --body, that write refuses a body missing any of those lines (ISSUE_LINKS_MISSING).