Source Intelligence

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 v2.1.246 Home All releases olderv2.1.245 v2.1.247newer
Claude Code v2.1.246

Plugin interfaces are checked before they are used

You'll notice
Useful2 Signal3
Plugins

A plugin publishing an interface for others now fails loudly if it isn't a proper object of functions.

What

When a plugin publishes an interface for other plugins to call, Claude Code now validates it: loading fails with a hooks error if the interface is not an object, or if any of its entries is not a function, and the message explains what an interface is meant to be.

Details
  • A 43-entry list of recognised manifest and frontmatter keys was added, covering name, description, model, allowed-tools, mcpServers, lspServers, workflows, monitors and userConfig among others.
  • Plugin hook-file discovery now runs the manifest through an extra parsing step before reading its hooks.
Evidence

is not a function; an interface is an object of methods (a value another plugin can call)

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

See this entry in the whole of v2.1.246 →