[Hooks Cannot See] (2) Require the output to entail the claim, not merely agree by EdbertChan · Pull Request #519 · EdbertChan/catstack

EdbertChan · 2026-09-13T03:03:45Z

Summary

This guidance helps people compare a statement with its evidence, so reviewers can tell what a result really proves.

A single container image was used to support a broader claim about newer runtime versions.

The check covered only that image, not the version boundary, so its output was true but the sentence overreached.

The new rule keeps claims within the tested case and marks broader claims as open.

Review Claim

Approve a rule that requires evidence to support the full statement, not merely agree with it.

Review Lane

behavior

Review Unit

corpus-lesson

Safety Invariant

Only the body of pull request #519 changes. No commits, pushes, branch changes, labels, comments, or edits to any other pull request are made. The body is published only after the checker passes, and the live body is checked again after publication.

Slice Rationale

Split from slice (1) because docs/ecosystem.md forbids engine runtime and corpus lessons in the same PR, and scripts/check_ecosystem_boundaries.py rejected the combined branch by name.

It sits after (1) because (1) is the mechanical half of the same reflect pass; a reviewer who reads the detectors first has the concrete failure in hand before the general rule.

Non-goals

Does not add a hook. Judging whether pasted output entails a sentence is a meaning question, not a regex one; the mechanical candidate is an llm-judge and is not in this slice.

Does not touch engine/. That is slice (1).

Does not restate the existing missing-check or hedge rules, which already cover their cases.

Test Plan

Prose-only slice; the gates that apply are the skill and ecosystem checks.

check_hook_test_coverage exit=0
check_ecosystem_boundaries exit=0
check_skills_three_harnesses exit=0
check_skill_file_refs exit=0
check_skill_test_coverage exit=0

Whole repo suite on the combined branch before the split:

Ran 463 tests in 1146.986s
OK
EXIT=0

python3 scripts/check_ecosystem_boundaries.py
python3 scripts/check_skill_file_refs.py
python3 scripts/check_skill_test_coverage.py --base origin/main — passes with tests/fires_narrow_output_wide_claim.md, the example for the new rule
python3 scripts/check_skills_three_harnesses.py
bash scripts/run_all_tests.sh — 49 directories, 0 failures

Revert Plan

Safe to revert? Yes
Revert command: git revert <sha>
Post-revert steps: None. The paragraph disappears from the skill; no runtime behaviour depends on it.
Data migration? No

EdbertChan · 2026-09-13T03:03:47Z

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	[Hooks Cannot See] (1) Teach two hooks the checks they could not see	#518
2	[Hooks Cannot See] (2) Require the output to entail the claim, not merely agree	#519	👈

cursor · 2026-09-13T03:03:51Z

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(requestId: serverGenReqId_bac5280c-bd98-4100-8056-7d56a041abd8)

…ody checker on PR #519's live body after the rewrite. Goal: Prove the body passes as published. Motivation: A PATCH that returned 200 is not proof the live body passes. Safety invariant: Read-only; a failed fetch fails the task instead of passing. Verify: exit code 0 and output PR body validation passed. Effectiveness measurement: The same checker the required GitHub check runs passes on the live body, so the PR is no longer blocked on its text. Exit code: 0

mergify · 2026-09-13T19:29:55Z

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

EdbertChan · 2026-09-13T19:37:31Z

Mergify repair stopped: missing required check validate

…rely agree The session behind slice (1) ran one command against one container image and proved that image had no corepack. That was written up as corepack having been removed from Node 25+, a version-boundary claim no command in the session ever checked. The output was true and the sentence was wider than the output. prove-it already covers a missing check and a hedge. It did not cover a check that ran, came back narrower than the claim, and got filed under the wider heading anyway -- which is the common case, because the cheap check is always the reachable instance. It binds hardest in a correction: restating the original overclaim while pasting a narrower proof relabels the mistake as a fix, which is what happened here before the rule existed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ZqCxSQVpmM9Rx37C7irgf Change-Id: Ibc32514be641d37277115faf6068e75ea02e0083

…the claim The skill test coverage gate requires a test change with any rule-shaped SKILL.md change. The new entailment rule gets a fires_ example, matching how the subagent-contradiction rule got fires_subagent_contradiction.md. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HQ9TkZeqARxv3e7W7xesYy Change-Id: Ia60c5c6a87b249bb186b83a5be5b0717603536bd

cursor · 2026-09-14T04:10:11Z

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EdbertChan · 2026-09-14T04:14:38Z

@Mergifyio queue

mergify · 2026-09-14T04:14:53Z

Merge Queue Status

✅ Entered queue — 2026-09-14 04:14 UTC · Rule: admin-bypass · triggered by @EdbertChan with the @mergifyio queue command
✅ Checks passed · on draft merge queue: checking #519 on main (344657b) #585
✅ Merged — 2026-09-14 04:23 UTC · at cf98899b484bbe226b14e7aee761c042ea77dd19 · squash

This pull request spent 8 minutes 57 seconds in the queue, including 8 minutes 12 seconds running CI.

Required conditions to merge

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

EdbertChan mentioned this pull request Sep 13, 2026

[Hooks Cannot See] (1) Teach two hooks the checks they could not see #518

Merged

5 tasks

EdbertChan added the admin-bypass label Sep 13, 2026

Base automatically changed from stack/EdbertChan/reflect/session-c2a4bea7/hooks-cannot-see-1-teach-two-hooks-checks-they-see--09fda6fc to main September 13, 2026 19:29

EdbertChan and others added 2 commits September 13, 2026 20:58

EdbertChan force-pushed the stack/EdbertChan/reflect/session-c2a4bea7/hooks-cannot-see-2-require-output-entail-claim--bc32514b branch from 9146fb8 to 2371e0a Compare September 14, 2026 04:10

mergify Bot added the queued label Sep 14, 2026

mergify Bot mentioned this pull request Sep 14, 2026

merge queue: checking #519 on main (344657b) #585

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mergify Bot merged commit cf98899 into main Sep 14, 2026
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mergify Bot deleted the stack/EdbertChan/reflect/session-c2a4bea7/hooks-cannot-see-2-require-output-entail-claim--bc32514b branch September 14, 2026 04:23

mergify Bot removed the queued label Sep 14, 2026

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[Hooks Cannot See] (2) Require the output to entail the claim, not merely agree - #519

[Hooks Cannot See] (2) Require the output to entail the claim, not merely agree#519
mergify[bot] merged 2 commits into
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stack/EdbertChan/reflect/session-c2a4bea7/hooks-cannot-see-2-require-output-entail-claim--bc32514b

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Summary

Review Claim

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Safety Invariant

Slice Rationale

Non-goals

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