feat(anthropic): support websearch tool #9407
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This PR adds support for Anthropic's Web Search tool (
web_search_20250305) to@langchain/anthropic, enabling Claude to perform real-time web searches and cite sources in its responses.Usage
Based on the direction from #9406 this would implement the websearch tool. Here is the example output from the example script:
{ messages: [ HumanMessage { "id": "c7416f2c-bea0-4e49-a3b6-384b23099211", "content": "What's the weather in NYC?", "additional_kwargs": {}, "response_metadata": {} }, AIMessage { "id": "msg_01CqUm4rR4KrgtUvemNA1gfK", "content": [ { "type": "server_tool_use", "id": "srvtoolu_01NottiD8nsS9Y4H64A1TEsb", "name": "web_search", "input": { "query": "NYC weather today" } }, { "type": "web_search_tool_result", "tool_use_id": "srvtoolu_01NottiD8nsS9Y4H64A1TEsb", "content": [ "[Object]", "[Object]", "[Object]", "[Object]", "[Object]", "[Object]", "[Object]", "[Object]", "[Object]", "[Object]" ] }, { "type": "text", "text": "Based on the latest weather information for New York City:\n\n**Today (Thursday, November 14):**\n" }, { "citations": [ "[Object]" ], "type": "text", "text": "Partly cloudy skies in the morning will give way to cloudy skies during the afternoon, with a high near 53°F and winds from the west-northwest at 10 to 15 mph." }, { "type": "text", "text": "\n\n**Tonight:**\n" }, { "citations": [ "[Object]" ], "type": "text", "text": "Mostly cloudy, then gradually becoming mostly clear, with a low around 42°F and west wind around 13 mph, with gusts as high as 24 mph." }, { "type": "text", "text": "\n\n**Recent Weather Note:**\n" }, { "citations": [ "[Object]" ], "type": "text", "text": "NYC saw its first snow of the season on Tuesday, with wintry showers during the morning commute." }, { "type": "text", "text": "\n\nThe weather is cool and breezy today with temperatures in the low 50s, typical for mid-November in New York City." } ], "name": "model", "additional_kwargs": { "model": "claude-sonnet-4-5-20250929", "id": "msg_01CqUm4rR4KrgtUvemNA1gfK", "type": "message", "role": "assistant", "stop_reason": "end_turn", "stop_sequence": null, "usage": { "input_tokens": 9422, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, "cache_creation": { "ephemeral_5m_input_tokens": 0, "ephemeral_1h_input_tokens": 0 }, "output_tokens": 290, "service_tier": "standard", "server_tool_use": { "web_search_requests": 1 } } }, "response_metadata": { "model": "claude-sonnet-4-5-20250929", "id": "msg_01CqUm4rR4KrgtUvemNA1gfK", "stop_reason": "end_turn", "stop_sequence": null, "usage": { "input_tokens": 9422, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, "cache_creation": { "ephemeral_5m_input_tokens": 0, "ephemeral_1h_input_tokens": 0 }, "output_tokens": 290, "service_tier": "standard", "server_tool_use": { "web_search_requests": 1 } }, "type": "message", "role": "assistant", "model_provider": "anthropic" }, "tool_calls": [], "invalid_tool_calls": [], "usage_metadata": { "input_tokens": 9422, "output_tokens": 290, "total_tokens": 9712, "input_token_details": { "cache_creation": 0, "cache_read": 0 } } } ] }