Builder

Helps you send 3–4 researcher subagents at one question in parallel, merge overlaps and gaps, and land a single citable brief instead of serial chat.

Helps you run a multi-phase project in Claude Code with GSD: `/gsd:new-project` through ship, atomic commits, verification gates, and `.planning/` you can resume after a reset.

Every skill I write holds the constraint I burned time discovering — the CLI flag that silently fails, the join pattern that actually works, the config the docs forgot to mention.