Scaffold one stage of a multi-step workflow: a per-stage subagent (with a SubagentStop gate), a manual launcher skill, and a dynamic-workflow script that orchestrates the stages deterministically. Run once per step you want to add.
Run a dynamic workflow on a real input, observe it without flooding context, verify its assumptions (gates fire, structured returns thread and branch, parallel stages overlap), then turn what you learn into edits to the workflow, its agents and skills, and the build-workflow generator that produced it. Use after…
Use when the user wants to plan a non-trivial change before writing code — refactor, migration, new feature, debugging strategy. Produces a written plan file, not implementation.