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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 v2.1.242

Plugins can carry a server-issued id in a sidecar file

Under the hood
Useful2 Signal4
Plugins not in their notes

A plugin can now carry a server-issued id in a file next to it, tying it to a server record.

server_plugin_id
What

The loader now reads a JSON file sitting next to a plugin and accepts a server_plugin_id from it, letting a plugin be tied back to a server record.

Details
  • The id must match plugin_ followed by up to 64 alphanumeric characters.
  • A sidecar that is not valid JSON, is not an object, or has a missing or malformed id is logged and ignored, and the plugin still loads.
  • Read whenever the sidecar exists; nothing gates it.
Evidence

server_plugin_id

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 v2.1.242 →