Claude Code on Google Cloud's Agent Platform changedgoogle-vertex-ai
Nearest release: v2.1.299, published 20 hours after 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 13 Oct 2026 04:17 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 13 Oct 2026 04:37 UTC.
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202202Claude Code decides between [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) and upfront loading by model generation:
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204204* **Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, and later**: Claude Code enables tool search by default.
205* **Earlier models, including all Claude 3.x models**: Claude Code loads MCP tool definitions upfront, because their Agent Platform serving stacks reject the required beta header. Setting `ENABLE_TOOL_SEARCH=true` doesn't override this.
205* **Earlier models**: Claude Code loads MCP tool definitions upfront, because their Agent Platform serving stacks reject the required beta header. Setting `ENABLE_TOOL_SEARCH=true` doesn't override this.
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207207Set `ENABLE_TOOL_SEARCH=false` to disable tool search on every model. Before 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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