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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 v2.1.222

Skill import from other agents refuses unsafe copies

You'll notice
Useful3 Signal0
Skills

Importing a skill from another agent now skips bad copies and tells you why instead of silently breaking.

What

Importing a skill from another agent now inspects the source directory and skips the copy with an explanation instead of producing a skill Claude Code cannot load.

Details
  • Skips when SKILL.md is larger than the size Claude Code loads.
  • Skips when SKILL.md starts with --- YAML frontmatter, which Codex treats as plain text.
  • Skips when the directory contains subdirectories that Claude Code would adopt as plugin components.
  • Skips when several case or encoding variants of SKILL.md exist in the same directory, and tells you to copy it manually.
  • A copy that proceeds rewrites SKILL.md and removes the destination if the copy fails part way.
Evidence

skill directory has multiple SKILL.md case/encoding variants \u2014 copy the skill manually

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.222 →