Step-by-step SKILL.md packages an AI follows for a single kind of task.
A skill is a focused playbook - instructions, examples and constraints - that makes any model reliable at one job, from SQL reporting to changelog writing. The router fills a plan's skill slot with the best match for the request.
Pre-/clear handoff writer. Routes this session's facts to durable stores, de-stales entry-point docs, runs the dual-seam audit (codex + fresh-context sub-agent), and writes the sender debrief + action
