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.
Fully self-driven task execution — Opus/Fable plans the work into a task list, subagents execute each task (escalating to Opus/Fable when a task is judged complex), then Opus/Fable reviews everything
