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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 v2.1.232

Tool search says once why it turned itself off

Use it now
Useful3 Signal3
Tool Search Notable

Tool search logs why it disabled itself and refuses entirely against a non-Anthropic base URL.

ENABLE_TOOL_SEARCHANTHROPIC_BASE_URL
What

The optimistic tool-search path now logs a single debug line naming its mode and the ENABLE_TOOL_SEARCH value, and refuses outright when ANTHROPIC_BASE_URL points at something other than a first-party Anthropic host.

Details
  • The refusal message tells you to set ENABLE_TOOL_SEARCH=true (or auto, or auto:N) if your proxy forwards tool_reference blocks.
  • The explanation is emitted once, not per request.
Evidence

is not a first-party Anthropic host. Set ENABLE_TOOL_SEARCH=true (or auto / auto:N) if your proxy forwards tool_reference blocks.

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 v2.1.232 →