Claude Code on Google Cloud's Agent Platform changedgoogle-vertex-ai
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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135135* **Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, and later**: Claude Code enables tool search by default.
136136* **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.
137137
138Set `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`.
138Set `ENABLE_TOOL_SEARCH=false` to disable tool search on every model.
139139
140140### 5. Pin model versions
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