Tools reference changedtools-reference
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625625The search backend is not configurable. To search with a different provider, add an [MCP server](/docs/en/mcp) that exposes a search tool.
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627627<Note>
628 WebSearch is available on the Claude API and [Claude Platform on AWS](/docs/en/claude-platform-on-aws). On Microsoft Foundry it requires a [deployment hosted on Anthropic](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options): deployments hosted on Azure don't support server-side tools, so the WebSearch call fails. On Google Cloud's Agent Platform it works with Claude 4 and later models, including Opus, Sonnet, and Haiku. Amazon Bedrock doesn't expose the server-side web search tool.
628 WebSearch is available on the Claude API, [Claude Platform on AWS](/docs/en/claude-platform-on-aws), and Microsoft Foundry. On Google Cloud's Agent Platform it works with Claude 4 and later models, including Opus, Sonnet, and Haiku. Amazon Bedrock doesn't expose the server-side web search tool.
629629</Note>
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631631### Session search limit
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