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Reading a new release v2.1.251 Analysing changes · 2/5 Writing the entries · 2/4 steps 470 findings $18.91 so far

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 v2.1.195

Hook Matcher Warnings for MCP Server Patterns

What

Claude Code now warns at startup if a hook matcher like mcp__my_server matches no known tool, because hook matchers are compared as exact strings — the correct pattern to match all tools from a server is mcp__my_server__.*.

Details
  • Warning message: "Hook matcher mcp__server matches no tool (it is compared as an exact string). To match all tools from this server, use mcp__server__.*. See CHANGELOG v2.1.195."
  • Only fires once per distinct matcher pattern per session.
Evidence

Hook matcher warning (search for "matches no tool (it is compared as an exact string). To match all tools from this server, use \"`)

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

See this entry in the whole of v2.1.195 →