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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

Bad metadata in frontmatter and manifests now warns

Use it now
Useful3 Signal0
Plugins

You now get a warning when metadata in a skill, command, plugin or marketplace file is the wrong type.

metadata
What

Authoring a skill, command, plugin manifest or marketplace entry with a non-object metadata value produces a validation warning instead of silent loss.

Details
  • The warning names the type actually found and states that the value is dropped or ignored at load time.
  • Applies to skill and command frontmatter, plugin manifests, and marketplace plugin entries.
Evidence

'metadata' must be a mapping (key: value pairs); got

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.222 →