Feature: Add web search support via OpenAI Responses API #68
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When the Claude CLI sends a request with web_search tool, this routes it to OpenAI's Responses API (which supports native web search) instead of the standard Chat Completions API. Features: - Detects web_search tool in incoming requests - Routes to OpenAI Responses API with appropriate model - Converts Anthropic messages to Responses API input format - Translates OpenAI response back to Anthropic format with citations - Supports both streaming and non-streaming modes - Works with custom OPENAI_BASE_URL This enables web search functionality when using the proxy with OpenAI models, which was previously not possible since the Chat Completions API does not support web search. Co-authored with Claude Code (https://claude.ai/claude-code)
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Summary
This PR adds web search support when using the proxy with OpenAI models. When the Claude CLI sends a request containing a
web_searchtool, the proxy routes it to OpenAI's Responses API (which supports native web search) instead of the standard Chat Completions API.Problem
The Claude CLI supports web search via the
web_searchtool, but the standard OpenAI Chat Completions API does not support web search. This means users of the proxy could not use web search functionality.Solution
Detect
web_searchtool in incoming requests and route them to OpenAI's Responses API, which does support web search. The response is then translated back to Anthropic's format so the Claude CLI can display it correctly.Features
web_searchtool in incoming Anthropic-format requestsserver_tool_useblocks for search callsweb_search_tool_resultblocks for resultsOPENAI_BASE_URLNew Functions
has_web_search_tool()- Detect web_search in tools listconvert_anthropic_messages_to_input()- Format messages for Responses APIget_openai_web_search_model()- Map model names to web search compatible modelscall_openai_responses_api_non_streaming()- Non-streaming API callconvert_openai_responses_to_anthropic()- Response format translationhandle_web_search_streaming()- Streaming support with SSE translationUsage
No configuration needed - web search is automatically detected and routed. Just use the Claude CLI with web search as normal:
Co-authored with Claude Code