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HomeDocsClaude Developer Platform 23 Oct 2026
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web-fetch-tool changedagents-and-tools/tool-use/web-fetch-tool

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245245## How to use web fetch
246246 
247247<Note>
248 An organization admin can turn off web fetch for your organization on the [**Capabilities**](https://platform.claude.com/settings/capabilities) page of the Claude Console. With web fetch off, a Messages API request that includes the tool fails with a 400 `invalid_request_error` that says web fetch is not enabled, and `web_fetch` calls in a [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) session return an error result to the agent while the session continues. With web fetch on, the admin can also set allowed or blocked domains for web fetch on the same page. For how the organization's domain lists apply, see [Domain filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/server-tools#domain-filtering) for Messages API requests and [Restrict web search and web fetch domains](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions) for Managed Agents sessions.
248 An organization admin can turn off web fetch for your organization on the [**Capabilities**](https://platform.claude.com/settings/capabilities) page of the Claude Console. With web fetch off, a Messages API request that includes the tool fails with a 400 `invalid_request_error` that says web fetch is not enabled. With web fetch on, the admin can also set allowed or blocked domains for web fetch on the same page. For how those lists apply to a request, see [Domain filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/server-tools#domain-filtering).
249249</Note>
250250 
251For how your organization's web fetch settings apply in Claude Managed Agents sessions, see [Restrict web search and web fetch domains](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions).
252 
251253Provide the web fetch tool in your API request:
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253255<CodeGroup>
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459461For domain filtering with `allowed_domains` and `blocked_domains`, see [Server tools](https://platform.claude.com/docs/en/agents-and-tools/tool-use/server-tools#domain-filtering).
460462 
461On [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview), set these fields on the `web_fetch` entry of the agent toolset, where each listed domain must be a plain hostname with no path; see [Restrict web search and web fetch domains](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions).
463On [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview), set these fields on the `web_fetch` entry of the agent toolset; see [Restrict web search and web fetch domains](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions).
462464 
463465### Content limits
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from line 883
881883 .build())
882884 .addTool(WebFetchTool20250910.builder()
883885 .maxUses(5L)
884 .citations(CitationsConfigParam.builder().enabled(true).build())
886 .citations(CitationsConfigParam.builder()
887 .enabled(true)
888 .build())
885889 .build())
886890 .build();
887891 
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