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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 v2.1.248

Plugins can contribute tools in the surface list

Under the hood
Useful3 Signal3
Plugins

Plugins can now list "tools" among the things they contribute.

What

The list of things a plugin can provide gained "tools" alongside settings, hooks and plugins, and a separate list enumerates hook, skill, subagent, command and mcp component kinds.

Evidence

["settings", "hooks", "plugins", "tools"]

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

See this entry in the whole of v2.1.248 →