GSD already watches .claude/skills/ (and .agents/skills/) at both user and project levels — see src/resources/extensions/gsd/skill-discovery.ts. Any skill written there is picked up on the next session without further wiring. This skill is the bridge from "spike done" to "skill available."

Invocation points:

End of Phase 3 (synthesize) in /gsd start spike — prompt suggests running this skill
User has a spike directory and wants to harvest it
Pre-existing RECOMMENDATION.md that deserves a permanent home

<core_principle> NOT EVERY SPIKE DESERVES A SKILL. If the recommendation was "don't do X," there may be no reusable guidance. Ask the user first; exit without writing if the answer is no.

PROJECT-LOCAL, NOT USER-GLOBAL. Write to .claude/skills/ in the repo, not ~/.claude/skills/. The skill encodes project-specific choices that should not leak into unrelated projects.

spike-wrap-up