diu-stop: a file citation buys silence only when it is backed by EdbertChan · Pull Request #784 · EdbertChan/catstack

EdbertChan · 2026-09-22T14:31:10Z

Summary

The gate that demands evidence for a claim goes quiet as soon as the paragraph contains anything shaped like a file and a line number.

It never checks that the file exists, that it was opened this session, or which version was read.

A made-up path silences it just as well as a real one.

A citation now only buys silence when it names the version it was read at, or the transcript shows that file being read this turn.

Review Claim

A file reference silences the evidence gate only when it is backed by a version or by a real read.

Review Lane

behavior

Review Unit

engine-runtime

Safety Invariant

When the transcript cannot be read, the gate does not go quiet: an unverifiable citation is treated as no citation, so the gate asks rather than assuming. This is the rule the repo already states in prose and enforced nowhere.

Slice Rationale

One condition in one gate, plus its fixtures. Independent of the other gate change in this stack, which is about telling a mention from a use.

Non-goals

Does not change which sentences the gate considers claims, and does not alter its message.

Test Plan

Run at this commit:

python3 engine/hooks/diu-stop/tests/test_hooks.py
Ran 87 tests in 1.204s
OK

Pinned cases: the claim alone blocks; the claim plus a real backed citation passes; the claim plus a fabricated path must block, which is what fails on main.

Revert Plan

Revert this commit. Any file-shaped string silences the gate again, as on main.

Note

Medium Risk
Changes Stop-hook enforcement behavior for agents citing files; stricter blocking when transcripts are missing, but scoped to the unverified-claim path only.

Overview
The diu-stop unverified-claim gate no longer treats a bare path:line as evidence. A paragraph only skips the check when the citation includes a read ref (path:line @ origin/main), or the session transcript shows a tool call that named that path (parsed from transcript_path JSONL tool_use inputs).

If the transcript cannot be read, citations are unchecked rather than assumed valid: the block still fires and the message names the paths and asks for an @ <ref> citation. Block copy now states that bare file:line is not output, aligned with prove-it guidance.

README documents the three citation outcomes. Tests cover backed reads, fabricated paths, ref-only silence, unreadable transcripts, and Grep-shaped tool inputs.

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EdbertChan · 2026-09-22T14:31:22Z

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	wrong-check-reflect: one shot per reply, and scope the reflect scan to the turn	#796
2	reflect: catch an evidence-order correction from the ledger transition, not from wording	#782
3	unverified-tag-ledger: gate the next-prompt reminder, default to stale only	#783
4	diu-stop: a file citation buys silence only when it is backed	#784	👈
5	diu-stop: the marker gate reads prose, so a mention is not a use	#785
6	cat-mode: show the escape-hatch tag in the form the gate accepts	#786
7	principle-subagent-inherits-scope: a brief carries decisions, not just facts and a question	#788
8	llm-judge: claude is the only default runner	#793

EdbertChan · 2026-09-22T18:38:37Z

Revision history

#	Type	Changes	Date
1	initial	`e409545`	2026-09-22 18:38 UTC
2	rebase	`e409545 → d01a1ea` (rebase only)	2026-09-22 18:38 UTC
3	content	`d01a1ea → 2166b85` (raw)	2026-09-23 14:06 UTC

cursor

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…e only The reminder was re-read to the user on every prompt for every outstanding claim, including claims whose proof had already been pasted. There was no way to turn it down: CATSTACK_HOOK_MODE_UNVERIFIED_TAG_LEDGER=off still printed the full list at exit 0, because this hook is not on run_hook and nothing reads the registry mode for it. CATSTACK_UNVERIFIED_TAG_REMINDER is read in-hook through _flags/flags.py, the one pattern proven to work here (wrong-check-reflect/detect.py:12-15, 191): stale default, and what unset means: only claims already 3+ turns old all the old behaviour off no injection Unset resolves to stale on purpose. A flag whose unset value is the old behaviour changes nothing for the person who asked for less. reminder() at :138 already computed that exact subset and threw it away at :145. The gate is on the injection only. Emission and recording are untouched on every setting, so `off` buys silence without emptying the ledger it is mined from. A value nobody understands, and an .env candidate that cannot be read, are both named on stderr instead of passing as "not set". hooks.toml gains an enabled_by line naming the flag. Nothing reads that field -- registry.py:15 is its only mention in the repo -- so it is documentation beside the gate, not the gate. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Change-Id: I4f465761ee7f84489616ba1e83c54eb98ceefff0

FILE_LINE_RE matched a path and a line number and the paragraph loop skipped the paragraph. Nothing checked that the file existed, that anyone had read it, or at what ref. Pasting a made-up path beside the same claim turned the gate off just as well: $ printf '%s' '{"last_assistant_message":"The problem was the old value at totally-made-up-file-that-does-not-exist.ts:99999.", ...}' \ | python3 engine/hooks/diu-stop/claude_stop_check.py exit=0 A citation now counts when it names the ref it was read at (`path:line @ origin/main`), or when the session transcript shows a tool call that named that path. That is the rule corpus/CLAUDE.learned.md already ships in prose and nothing enforced. Third outcome, pinned: when the transcript cannot be read, the citation is unchecked rather than clear. It does not buy silence, the reason goes to stderr, and the block names the path it could not check. tests/test_hooks.py:412 asserted the old behaviour. Its own PR, #479, listed the file:line exemption under Non-goals -- it carried the exemption over so fence normalization would not regress it, and did not decide that an unread path should silence anything. The test keeps that intent and now backs its citation with a read. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Change-Id: I9ece412c527ac3272bf86d31d8089db65fd685f5

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mergify · 2026-09-24T09:01:38Z

Queued — the merge queue status continues in this comment ↓.

EdbertChan · 2026-09-24T09:04:14Z

@Mergifyio queue

mergify · 2026-09-24T09:04:22Z

Merge Queue Status

✅ Entered queue — 2026-09-24 09:04 UTC · Rule: admin-bypass · triggered by @EdbertChan with the @mergifyio queue command
✅ Checks passed · on draft merge queue: checking #784 on main (fe4fe56) #925
✅ Merged — 2026-09-24 09:35 UTC · at 99a36bda06dcaf71ddeb2f3ca1f62dc6088a94c7 · squash

This pull request spent 31 minutes 21 seconds in the queue, including 30 minutes 31 seconds running CI.

Required conditions to merge

check-success = lint
check-success = test
check-success = validate

EdbertChan force-pushed the stack/EdbertChan/reflect/subagent-decisions-slot-20260922/diu-stop-file-citation-buys-silence-only-backed--9ece412c branch from e409545 to d01a1ea Compare September 22, 2026 18:38

EdbertChan mentioned this pull request Sep 22, 2026

wrong-check-reflect: one shot per reply, and scope the reflect scan to the turn #796

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cursor Bot reviewed Sep 22, 2026

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Comment thread engine/hooks/diu-stop/claude_stop_check.py

EdbertChan added the admin-bypass label Sep 22, 2026

EdbertChan force-pushed the stack/EdbertChan/reflect/subagent-decisions-slot-20260922/diu-stop-file-citation-buys-silence-only-backed--9ece412c branch from d01a1ea to 2166b85 Compare September 23, 2026 14:06

EdbertChan force-pushed the stack/EdbertChan/reflect/subagent-decisions-slot-20260922/unverified-tag-ledger-gate-next-prompt-reminder--4f465761 branch from 4d9f2f3 to 1d1cad5 Compare September 23, 2026 14:06

EdbertChan force-pushed the stack/EdbertChan/reflect/subagent-decisions-slot-20260922/unverified-tag-ledger-gate-next-prompt-reminder--4f465761 branch from 1d1cad5 to ba95eda Compare September 24, 2026 08:02

EdbertChan force-pushed the stack/EdbertChan/reflect/subagent-decisions-slot-20260922/diu-stop-file-citation-buys-silence-only-backed--9ece412c branch from 2166b85 to 717a1f8 Compare September 24, 2026 08:29

EdbertChan changed the base branch from stack/EdbertChan/reflect/subagent-decisions-slot-20260922/unverified-tag-ledger-gate-next-prompt-reminder--4f465761 to main September 24, 2026 09:00

mergify Bot added the queued label Sep 24, 2026

mergify Bot mentioned this pull request Sep 24, 2026

merge queue: checking #784 on main (fe4fe56) #925

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mergify Bot merged commit 99a36bd into main Sep 24, 2026
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mergify Bot removed the queued label Sep 24, 2026

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diu-stop: a file citation buys silence only when it is backed - #784

diu-stop: a file citation buys silence only when it is backed#784
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