Changelog (maintainer-only)

Keep CHANGELOG.md honest with package.json. The dependency is the version bump: the moment package.json's version changes, the new version needs a matching section at the top of CHANGELOG.md, with one concise bullet per consumer-facing change (AGENTS.base.md, a skill under skills/, bin/sync.mjs, templates/). The changelog is considered stale until that section exists.

A PostToolUse hook (.claude/hooks/changelog-check.mjs, wired in .claude/settings.json) enforces this automatically: after any edit, if package.json's version has no CHANGELOG.md section yet, it injects a reminder pointing back here. So in practice this skill fires as soon as you bump the version — you don't have to remember to invoke it.

This skill is local to this repo and must stay that way. It lives in .claude/skills/, not in skills/, so bin/sync.mjs never fans it out to Claude/Cursor/AGENTS.md, package.json's files never publishes it, and no consumer of the package ever sees it. Do not move it into skills/ and do not add it to the ## Skills index — that would expose a maintainer tool to every downstream repo.

When this fires