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2121| Anthropic API | Available |
2222| 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.
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2426Because 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.
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2628<Note>