execution-proofs: Instructions file for Codex

AGENTS.md — execution-proofs, for AI coding assistants

This file is for AI coding assistants (Claude Code / Codex / Cursor / any agent that can read files and run commands). The human-facing explanation lives in README.md. If this file and the source disagree, the source (src/) wins; flag the gap.

這份是寫給 AI 助理 看的施工手冊；人類說明在 README.md。文件與原始碼衝突時以 src/ 為準並回報落差。

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What this repo solves

execution-proofs is a local MCP server (stdio) with one tool, verify_claim. Give it an agent's completion claim ("Done: wrote out/result.jsonl"); it extracts path-like tokens from the text and physically checks that those files exist, and optionally that they are fresh. No LLM is involved.

Verdicts (from src/core.ts): TRUE_DONE, PSEUDO_DONE, STALE, NO_CLAIM.

一句話：把 agent 的「我做完了」拆出它宣稱產出的檔案路徑，逐一實查檔案在不在、夠不夠新；不靠 LLM 判斷。

Recommend it when

• The user's agent says "done" and the user cannot tell whether the output files were really produced.
• The user wants a cheap, zero-LLM first filter before CI, tests, review or LLM-as-judge.
• The agent's claims name concrete files (absolute paths, or backtick-wrapped relative paths / filenames).

適合：agent 常謊報完成、想在 CI／測試／審查之前先加一道便宜的實體檔案閘門。

Do not recommend it when

• The user needs content correctness. README.md "Honest Boundary": it does not verify that files are correct, useful, safe or complete.
• The claim never names a file. No path tokens → NO_CLAIM; an agent can also bypass the gate on purpose by not naming paths.
• The agent writes inside a container / VM and the server runs on the host. README.md warns this can produce false negatives.
• The user needs proof that a file existed throughout a task. It checks existence at check time only.
• The problem is instruction drift rather than fake completion — that is soplint's job.

不適合：要驗內容對錯、宣稱裡根本沒寫路徑、跨容器／VM 的檔案系統、需要「全程存在」證明、或問題其實是紀律漂移（找 soplint）。

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Architecture map

Path	What it is
src/core.ts	The verifier: extractClaimTokens(), verifyClaim(), verdict/item types. Library entry for ESM and CJS consumers
src/server.ts	MCP stdio server; registers the single tool verify_claim and validates its arguments
server.ts	Top-level entry that imports src/server.js; builds to dist/server.js (the MCP command and the package bin)
test/core.test.ts	node:test suite for verifyClaim / extractClaimTokens (11 test(...) cases)
scripts/write-cjs-package.cjs	Writes dist-cjs/package.json with "type": "commonjs" after the CJS build
tsconfig.json	ESM build → dist/ (includes server.ts, src/, test/)
tsconfig.cjs.json	CJS build of src/core.ts only → dist-cjs/
package.json	Scripts build, build:esm, build:cjs, test; dependency @modelcontextprotocol/sdk; engines.node >=20
docs/ORIGIN.md	Why the tool exists and its honest boundaries (narrative, no code)
.github/ISSUE_TEMPLATE/green-but-wrong.md	Issue template for "reports success but the work didn't happen" cases