The Claude Agent SDK auto-discovers SKILL.md files under /app/.claude/skills/. Both the Python core and the Node SDK runner share the same mount, so a new skill is visible to every head immediately.
Implication
- Add a new playbook → write a SKILL.md. No code change, no deploy.
- You can write skills via the floating chat widget. "Create a skill called renewal-playbook that teaches the agent how to draft a renewal email." → admin_skill_create stage → confirm → live.