What
Claude now receives session-appropriate instructions about skill creation rather than a single generic message, covering four cases depending on what tools the session has.
Details
- Sessions with
save_skilltool available: "Skill files on disk are a read-only cache: editing them does not change the user's saved skill. To create or update a skill, use thesave_skilltool." - Sessions with skill-proposal capability: "propose it with the
[propose_skill]tool." - Sessions with skill-delivery capability: "write it as a
.skillfile … and send it with the[deliver_skill]tool." - All other sessions: "You cannot create or modify skills in this session. … say you can't do that here and point the user to their claude.ai settings."
- Plugin skills are an exception in all cases: customise through the
cowork-pluginskill if available.
Evidence
Skill-saving system prompt (search for "# Saving skills" or "Skill files on disk in this session").
Strings lifted out of the shipped bundle, so the claim above can be checked against them.