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.
Expert LangGraph skill for stateful multi-agent workflows — invoke when building graph-based agents, human-in-the-loop flows, checkpointed resumable pipelines, supervisor/swarm multi-agent systems, or
