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Sweep 12 Nov 2026 · 23:00Z Build v2.1.323 540 read Stable v2.1.311 Latest v2.1.323 Next v2.1.323 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.323 ·

Add-ons can now hook into the list of tools

Add-on code can now respond to a tool.list event when Claude Code lists its tools

Use it now New Features
JSON All of v2.1.323
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Plugin HooksArea: what it touches
New FeaturesKind: in v2.1.323,
What probably matters to youSection of the release
What

Add-on code that extends Claude Code can respond to named events, such as tool.describe and command.describe. Claude Code now also accepts tool.list, and the error message for an unknown event now lists it among the allowed names.

Why

Add-on code can now take part when the list of tools is put together, and not only when a single tool is described.

Read from
Names in the bundletool.listtool.describecommand.describe
What the documentation says
Documented inclaude-code/plugins/mods/reference
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeChanged tool.list plugin hooks so the tools they add or remove apply to the model and every agent

See this entry in the whole of v2.1.323 →

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