Observed arrival · 2026-09-10

PlaybookDiff audits the instructions AI coding agents actually receive

playbookdiff.dev Observed source

Editorial interest 86/100 Selection signal · not a rating of the site

An open-source, read-only CLI and GitHub Action compares Claude Code and Codex repository configuration.

Landing page captured for the 2026-09-10 issue.

Field notes

The analyzer accepts a repository, launch directory, and target path, then traces which instruction files and skills each coding agent receives at that location. Its displayed example follows apps/api/file.ts and reports two medium findings: a nested instruction Claude Code receives but Codex does not, plus an api-skill available only through Claude Code. The page also documents a GitHub Action, security model, limitations, and a supported-semantics matrix.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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