milestoneCreate, switch, and close milestones in `.agent/milestone/`. Milestones are strategic initiatives that span multiple topics and sessions (e.g. "cleanup and patterns", "ship v1 iOS app"). Each milestone is a folder with its own scope, steps, progress, and notes — giving agents a tight context window
planCreate and manage implementation plans in .agent/plan/ files. Use this skill when: starting a new feature or refactor, the user says "plan this", "think about how to", "design the approach", "prepare a plan", or any time structured planning is needed before execution. Plans are the source of truth f