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web-search-tool changedagents-and-tools/tool-use/web-search-tool

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2121The examples on this page use `web_search_20250305` for basic search and `web_search_20260318` for dynamic filtering.
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2323<Note>
24 For [Claude Mythos Preview](https://anthropic.com/glasswing), web search is supported on the Claude API, Google Cloud, and Microsoft Foundry. Web search is not available for Mythos Preview on Amazon Bedrock or [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws).
24 For [Claude Mythos Preview](https://anthropic.com/glasswing), web search is supported on the Claude API, Claude Models on Google Cloud (Google managed), and Microsoft Foundry.
2525</Note>
2626 
2727For web search's Zero Data Retention eligibility and the related `allowed_callers` configuration, see [Server tools](https://platform.claude.com/docs/en/agents-and-tools/tool-use/server-tools#zdr-and-allowed-callers).
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6565To call web search directly, without dynamic filtering, set `allowed_callers: ["direct"]`. Models that don't support programmatic tool calling require this setting. Without it, the API returns a 400 error that tells you to set it.
6666 
6767<Note>
68 The web search tool (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, deployments [hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) support only the basic web search tool (`web_search_20250305`, without dynamic filtering). Deployments hosted on Anthropic support all versions. On Google Cloud, only the basic web search tool (without dynamic filtering) is available. Web search is not available on Amazon Bedrock.
68 The web search tool (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/anthropic-managed), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, deployments [hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) support only the basic web search tool (`web_search_20250305`, without dynamic filtering). Deployments hosted on Anthropic support all versions. On Claude Models on Google Cloud (Google managed), only the basic web search tool (without dynamic filtering) is available.
6969</Note>
7070 
7171The following examples use `web_search_20260318`:
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