Web search and web fetch changedthird-party/claude-desktop/web-tools
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1414Web Search is a **server-side tool** executed by your inference provider, not by the desktop app. Availability depends on which provider you've configured:
1515
16| Provider | Web Search |
17| ----------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
18| Google Cloud's Agent Platform | Available |
19| Microsoft Foundry | Available |
20| Amazon Bedrock | Not available natively; use the [built-in web search](#built-in-web-search) below |
21| Anthropic API | Available |
22| Gateway | Available if your gateway implements Anthropic's `web_search` server tool, passes it through to a provider that does, or runs the search itself; see [Gateway-side search](#gateway-side-search) |
16| Provider | Web Search |
17| ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
18| Google Cloud's Agent Platform | Available |
19| Microsoft Foundry | Available on deployments [hosted on Anthropic](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options) only; for deployments hosted on Azure, use the [built-in web search](#built-in-web-search) below |
20| Amazon Bedrock | Not available natively; use the [built-in web search](#built-in-web-search) below |
21| Anthropic API | Available |
22| Gateway | Available if your gateway implements Anthropic's `web_search` server tool, passes it through to a provider that does, or runs the search itself; see [Gateway-side search](#gateway-side-search) |
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24The [Claude apps gateway](https://code.claude.com/docs/en/claude-apps-gateway) passes the `web_search` tool through to its upstream provider, so Web Search works in Claude Desktop behind that gateway when the upstream is Google Cloud's Agent Platform, Microsoft Foundry, or the Anthropic API. Claude Desktop can't see which upstream the gateway routes to and offers the tool regardless, so if the gateway routes any model to Amazon Bedrock, add `"WebSearch"` to `disabledBuiltinTools` in the gateway's [Claude Desktop overlay](https://code.claude.com/docs/en/claude-apps-gateway-config#claude-desktop-overlay) and use the [built-in web search](#built-in-web-search) instead.
24On Microsoft Foundry, Web Search availability depends on the [hosting option](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options) you chose when you deployed the model. Deployments hosted on Azure do not support server-side tools, including web search, and return an error for requests that use them. For those deployments, add `"WebSearch"` to [`disabledBuiltinTools`](/docs/third-party/claude-desktop/configuration#disabledbuiltintools) so the app does not offer provider-side search, and configure the [built-in web search](#built-in-web-search) instead. See [features not supported when hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) in the Claude in Microsoft Foundry documentation for the full list.
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26The [Claude apps gateway](https://code.claude.com/docs/en/claude-apps-gateway) passes the `web_search` tool through to its upstream provider, so Web Search works in Claude Desktop behind that gateway when the upstream is Google Cloud's Agent Platform, a Microsoft Foundry deployment hosted on Anthropic, or the Anthropic API. Claude Desktop can't see which upstream the gateway routes to and offers the tool regardless, so if the gateway routes any model to Amazon Bedrock or to a Microsoft Foundry deployment hosted on Azure, add `"WebSearch"` to `disabledBuiltinTools` in the gateway's [Claude Desktop overlay](https://code.claude.com/docs/en/claude-apps-gateway-config#claude-desktop-overlay) and use the [built-in web search](#built-in-web-search) instead.
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2628Because the search runs on the provider's infrastructure, queries and results travel over the same path as model inference and are subject to your provider's data-handling terms. No additional firewall rules are needed beyond the inference endpoint itself.
2729
2830<Note>
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3133
3234### Web search options
3335
34If your inference provider supports native search (Google Cloud's Agent Platform, Microsoft Foundry), that's the simplest path and no additional configuration is required. For Amazon Bedrock or a custom gateway, or whenever you want to choose the search backend, use the built-in `websearch` server.
36If your inference provider supports native search (Google Cloud's Agent Platform, or a Microsoft Foundry deployment hosted on Anthropic), that's the simplest path and no additional configuration is required. Use the built-in `websearch` server when your provider has no native search (Amazon Bedrock, a Microsoft Foundry deployment hosted on Azure, or a custom gateway), or with any provider when you want to choose the search backend.
3537
36| Option | Best for | Where you configure it | Search backend |
37| ------------------------------------------ | ---------------------------------------------------------------------------------------------- | ----------------------------- | -------------------------------------- |
38| [Provider-native](#provider-native-search) | Google Cloud's Agent Platform, Microsoft Foundry | Your cloud provider's console | The provider's |
39| [Built-in](#built-in-web-search) | Amazon Bedrock or a custom gateway; or any provider when you want to choose the search backend | `managedMcpServers` | Brave, Tavily, Exa, or your own server |
40| [Gateway-side](#gateway-side-search) | A custom gateway you already run | Your gateway's configuration | Whatever your gateway is wired to |
41| [Remote search MCP](#remote-search-mcp) | A search MCP you already run, or Amazon Bedrock AgentCore | `managedMcpServers` | Whatever that MCP exposes |
38| Option | Best for | Where you configure it | Search backend |
39| ------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------- | -------------------------------------- |
40| [Provider-native](#provider-native-search) | Google Cloud's Agent Platform, Microsoft Foundry (hosted on Anthropic) | Your cloud provider's console | The provider's |
41| [Built-in](#built-in-web-search) | Amazon Bedrock, Microsoft Foundry (hosted on Azure), or a custom gateway; or any provider when you want to choose the search backend | `managedMcpServers` | Brave, Tavily, Exa, or your own server |
42| [Gateway-side](#gateway-side-search) | A custom gateway you already run | Your gateway's configuration | Whatever your gateway is wired to |
43| [Remote search MCP](#remote-search-mcp) | A search MCP you already run, or Amazon Bedrock AgentCore | `managedMcpServers` | Whatever that MCP exposes |
4244
4345#### Provider-native search
4446
45Google Cloud's Agent Platform grounding and Microsoft Foundry execute search inside the model call. There's nothing to configure in Claude Desktop; enable search on the cloud provider's side. Amazon Bedrock has no native equivalent (Amazon Bedrock AgentCore is a remote MCP server; see [Remote search MCP](#remote-search-mcp)).
47Google Cloud's Agent Platform grounding and Microsoft Foundry deployments hosted on Anthropic both execute search inside the model call. There's nothing to configure in Claude Desktop. Any setup happens on the cloud provider's side. Amazon Bedrock and Microsoft Foundry deployments hosted on Azure have no native equivalent (Amazon Bedrock AgentCore is a remote MCP server; see [Remote search MCP](#remote-search-mcp)).
4648
4749#### Built-in web search
4850
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