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stop hook: break the continuation loop without the host flag (mr-j30) - #217
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The Stop hook trusted the host's stop_hook_active to yield on the second pass, but Codex reports it false during hook-driven continuations (captured: dozens of block reasons, four yields), so the gate could refuse forever — a hang. Add a host-independent guard: a per-session state file counts consecutive refusals, both per blocker set (a small limit) and session-wide (a larger cap, for a loop whose blocker set keeps changing), and the hook stands down loudly at either limit, exactly as the host-driven second pass does. A pass, or a stand-down, clears the record, so a later session never inherits a spent count. The guard is best-effort (a state failure only skips it), so it can only fail toward blocking. It covers the missing-binary path too — the other refusal a session cannot clear from inside — and the limits are validated env overrides.
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Summary by CodeRabbit
WalkthroughThe Stop hook now tracks repeated refusals by blocker signature and session. It yields at configured limits and clears the record after a pass or stand-down. Tests, documentation, and metareview records cover the guard and a review-loop workflow. ChangesStop-hook loop guard
Review-loop workflow records
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant StopHook
participant GateCLI
participant GuardState
StopHook->>GateCLI: Run status check
GateCLI-->>StopHook: Return pass, blockers, or failure
StopHook->>GuardState: Read and update refusal counts
StopHook->>GuardState: Clear record on pass or stand-down
Merge Risk: 🟡 Moderate · up to The guard bounds repeated refusals, but another local user can manipulate fallback state to force an early stand-down, and overlapping sessions can delay the limit. Secure state storage and serialize updates before merging; clarify the persistence and checkout-sharing limitations. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 4
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Inline comments:
Review comments at @docs/ARCHITECTURE.md:
- Around line 217-220: Update the loop-break guarantee in the documentation to
clarify that refusal limits apply only when refusal state can be persisted; when
no record is readable and no state location is writable, repeated refusals may
continue without reaching either limit.
- Line 218: Update the STOP_KEY description in the refusal-count documentation
to clarify that when session_id is absent, the reported checkout is used as the
fallback key, so sessions in the same checkout share a refusal record and one
session’s pass or stand-down can clear another’s count.
Review comments at @hooks/pre-finish.sh:
- Line 138: Update the stop-gate state-directory selection around `mkdir -p
"$dir"` to reject directories not owned by the current user or writable by group
or others, checking the directory itself after creation. Preserve the existing
writable-directory check and fallback flow, and do not use a shared temporary
directory unless it passes these ownership and permission checks.
- Line 160: In block_is_repeat, serialize the full read-increment-write sequence
for each state file with a per-state-file lock, then write through a temporary
file in the same directory and replace the state file with mv. Do not rely on
atomic replacement alone; concurrent hooks must not lose counter increments.
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CHANGELOG.mddocs/ARCHITECTURE.mddocs/metareview/context/mrv-20261001-064207677935000-pr-ready-branch-10d735e5-context.mddocs/metareview/fsm/mrv-20261001-063847006475000-fsm-review-loop-review-loop-0a2c955e/audit.redacted.jsonldocs/metareview/fsm/mrv-20261001-063847006475000-fsm-review-loop-review-loop-0a2c955e/manifest.jsondocs/metareview/fsm/mrv-20261001-063847006475000-fsm-review-loop-review-loop-0a2c955e/snapshot.jsondocs/metareview/fsm/mrv-20261001-063847006475000-fsm-review-loop-review-loop-0a2c955e/workflow.yamldocs/metareview/reviews/mrv-20261001-064207677935000-pr-ready-branch-10d735e5.mdhooks/pre-finish.shinternal/githooktest/stophook_layout_test.gotests/go/test-stop-hook.sh
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…fixes (#219) * Release 0.14.1: judge isolation, evidence shapes, gate and Stop-hook fixes Bump the version in every manifest and write the 0.14.1 CHANGELOG entry from every PR merged since 0.14.0 (#214 claude judge isolation, #215 freeform evidence shapes, #216 pr-ready blocking-finding gate, #217 Stop-hook loop guard). * Release 0.14.1: pr-ready review logs, FSM bundle and the two stale-finding overrides
Fixes bead mr-j30 (P2): the Stop gate could livelock — refuse forever — under Codex.
The bug
hooks/pre-finish.shtrusted the host'sstop_hook_activefield to yield on the second pass, but Codex reports it false during hook-driven continuations (captured 2026-09-26: dozens of block reasons, only four yields). A session blocked on something it cannot clear (metareview statusexits 1) would then be refused on every Stop, forever — a hang, which teaches operators to remove the hook.The fix
A host-independent loop guard in the Stop hook: a per-session state file counts consecutive refusals and, once the count reaches its limit, the hook stands down loudly on stderr — exactly as the host-driven second pass does — and clears the record.
must_cleartargets/verdicts), and a larger session-wide cap for a set that keeps changing. An empty/unreadable signature is its own signature, so it still counts.CODE==1blocker path, the broken-gate path (a persistently failingstatus), and the missing-binary path. A pass, or a stand-down, clears the record, so a later session never inherits a spent count.session_id, else the stable reported checkout — never a process id, which would change every turn and leave the guard inert exactly where it is needed.$XDG_CACHE_HOME→$HOME/.cache), falling back to the repository's git dir and only then the temp dir; it is created lazily (a session that never blocks leaves nothing behind). The whole mechanism is best-effort and fails toward blocking.Review
Reviewed with adversarial
review-looprounds (pi subagents), which caught: an empty signature short-circuiting before counting (so the cap never fired), a state location poisonable via a shared temp dir, the broken-gate path being unguarded, and — importantly — that making the key stable would trip the shell suite'stests/go/test-stop-hook.shcase 11 (its four no-session refusals are independent first passes); that suite now sets the guard aside and isolatesXDG_CACHE_HOME.metareview review pr-ready→ PASS;go test ./...,go vet,golangci-lint,shellcheckand the shell suite all clean.Residual advisory (confirmed, deferred): in the narrow case where the cache dir, the repo git dir and the temp dir are all unwritable the guard is inert (fails toward blocking); and a no-session host whose reported cwd moves between turns resets the count.
Note
Medium Risk
Changes Stop-gate enforcement semantics (stand-down after repeated blocks can bypass the gate) and adds best-effort persisted state with narrow fail-open edge cases when no safe state directory exists.
Overview
Fixes mr-j30: under Codex,
stop_hook_activestays false during hook-driven continuations, so the Stop hook could block forever on blockers the session cannot clear.hooks/pre-finish.shadds a host-independent loop guard that persists per-session refusal counts (private cache → repo git dir → temp, with ownership/mode checks viastop_guard_writable). It stands down loudly after configurable limits—the same blocker set (METAREVIEW_STOP_GUARD_LIMIT, default 3) or any repeated refusals in the session (METAREVIEW_STOP_GUARD_TOTAL, default 6)—not only whenstop_hook_activeis set. That applies to unresolved blockers (hashedmust_clearsignature), missingmetareview, and persistently brokenstatusexits; passes and stand-downs callstop_guard_clearso later runs are not stuck with a spent counter.Tests and docs:
internal/githooktest/stophook_layout_test.goadds coverage for continuation loops, session-wide cap, broken gate, pass/stand-down reset, and poisoned state dirs;tests/go/test-stop-hook.shisolates cache state and raises guard limits so existing “first pass must block” cases stay independent. CHANGELOG and ARCHITECTURE document the fix and behavior.Reviewed by Cursor Bugbot for commit bbe2815. Bugbot is set up for automated code reviews on this repo. Configure here.