feat: add Anthropic tool_search_tool_bm25_20251119 for lazy loading#260
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feat: add Anthropic tool_search_tool_bm25_20251119 for lazy loading#260
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Add support for Anthropic's Advanced Tool Use standard by implementing
the tool_search_tool_bm25_20251119 tool alongside existing retrieve_tools.
This tool name is fine-tuned into Claude models for on-demand tool
discovery. Returns tool_reference content blocks per Anthropic's custom
implementation format, enabling lazy loading of tools.
Key changes:
- Add tool_search_tool_bm25_20251119 tool registration
- Implement handleToolSearchBM25 handler with BM25 search
- Return tool_reference format: [{"type":"tool_reference","tool_name":"..."}]
- Fixed 5-result limit per Anthropic standard
- Full activity logging (Spec 024)
References:
- https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
- https://www.anthropic.com/engineering/advanced-tool-use
Closes: anthropics/claude-code#7336
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
tool_search_tool_bm25_20251119tooltool_referencecontent blocks per Anthropic's custom implementation formatretrieve_toolsfor backward compatibilityChanges
tool_search_tool_bm25_20251119tool registration inregisterTools()handleToolSearchBM25handler using existing BM25 search index[{"type":"tool_reference","tool_name":"server:tool"}]References
Test plan
go build ./cmd/mcpproxy/...)go test ./internal/server/... -run TestMCP)🤖 Generated with Claude Code