Connect Claude Code to tools via MCP changedmcp
Nearest release: v2.1.322, published an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 10 Nov 2026 03:06 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 10 Nov 2026 03:07 UTC.
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17961796* **Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, and later**: tool search is on by default, the same as on the Anthropic API.
17971797* **Earlier Agent Platform models**: Claude Code loads all MCP tools upfront, because their serving stacks reject the required beta header. `ENABLE_TOOL_SEARCH=true` doesn't override this.
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1799Before v2.1.221, Claude Code disabled tool search for all models on Google Cloud's Agent Platform unless you set `ENABLE_TOOL_SEARCH=true`.
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18011799Control tool search behavior with the `ENABLE_TOOL_SEARCH` environment variable:
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18031801| Value | Behavior |
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