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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.216

Skill Creation Context Tailored by Session Type

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_skill tool 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 the save_skill tool."
  • Sessions with skill-proposal capability: "propose it with the [propose_skill] tool."
  • Sessions with skill-delivery capability: "write it as a .skill file … 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-plugin skill 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.

See this entry in the whole of v2.1.216 →