Load one instruction source in both harnesses - #43
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Codex reads AGENTS.md. Claude Code reads CLAUDE.md, and only some of its versions and settings also read AGENTS.md. A CLAUDE.md that only imports AGENTS.md makes both harnesses load the same text. A documentation test keeps it a bare import, and the exact package allowlist keeps it out of the npm tarball. AGENTS.md also gains facts that fresh sessions had to rediscover: the check command and its cost, which sibling repository owns the Service API, the Plan format, and Skill packaging, and when to get an independent review through cross-review from either harness. That review covers what machine consumers such as the Skill depend on: the accepted API-contract range and Plan formats, command names and flags, handled error values, and exit statuses. Human-readable detail text and progress lines are left out, because docs/errors.md tells consumers not to branch on them. Naming all output and errors would cover most CLI changes. In firstdraft, a trigger that broad matched 188 of 250 PRs, and 97 of those recorded no review.
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Summary
CLAUDE.mdcontaining@AGENTS.md, so Claude Code and Codex load the same instructions.codex-reviewfrom Claude Code,$claude-reviewfrom Codex).Part of Step 3 of the 2026-09-29 agent-documentation audit; the matching firstdraft change is firstdraft/firstdraft#910.
Docs: updated AGENTS.md and docs/README.md.
Validation
npm ci --ignore-scripts && npm run check: pass.Review
cross-review
codex-review, new session overorigin/main..HEAD, with firstdraft'sdocs/review-focus.mdas focus text. Verdict: Approve, no findings (session26de7e04-ec1b-4079-a3d8-15dcea2f1ab0).