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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.

All of v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Plugin names checked for invisible and separator characters

You'll notice
Useful3 Signal2
Plugins

Plugin names with @, colons, whitespace, path separators or invisible characters are now rejected.

What

A plugin manifest is now rejected with a validation error if its name is empty or contains @, :, whitespace, a path separator, or an invisible or control character. Naming a plugin after its own directory produces a specific hint.

Details
  • A manifest version containing unprintable characters is treated as if absent, with a warning rather than a hard failure.
Evidence

must be non-empty and must not contain "@", ":", whitespace, path separators, or invisible/control characters

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

See this entry in the whole of v2.1.239 →