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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 v2.1.221

Tool search no longer disabled on Vertex AI

You'll notice
Useful4 Signal0
Tool Use Notable

Tool search now runs on Vertex AI instead of being refused outright.

ENABLE_TOOL_SEARCHANTHROPIC_BASE_URL
What

Optimistic tool search now runs on Vertex instead of being refused up front.

Details
  • The block that logged that Vertex "does not accept the tool-search beta header" and told you to set ENABLE_TOOL_SEARCH=true has been deleted.
  • The only remaining bail-out is for non-first-party ANTHROPIC_BASE_URL hosts.
  • ENABLE_TOOL_SEARCH still overrides the mode.
Evidence

ENABLE_TOOL_SEARCH

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 v2.1.221 →