references/checker.md — behavior of this repository's
structural checker; its tests are the executable contract.
# Sources of truth
- [Agent Skills specification](https://agentskills.io/specification) — portable
skill contract.
- Pi's installed `skills.md` at `$PI_CONTEXT_DOCS_PATH/skills.md` — current Pi
discovery, loading, invocation, and validation behavior.
- [Pi skills documentation](https://github.com/earendil-works/pi/blob/main/docs/skills.md)
— repository fallback when installed docs are unavailable.
- [`references/checker.md`](checker.md) — behavior of this repository's
structural checker; its tests are the executable contract.