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Claude Code introduced tool search for MCP (Model Context Protocol) servers, reducing context usage by up to 95%. Instead of preloading all available tools into the context window (which could consume 60,000+ tokens), the system now dynamically discovers and loads only 3-5 relevant tools when MCP tools exceed 10% of the context window. This progressive disclosure approach addresses token inefficiency, a major issue when using multiple MCP servers. The team chose this search-based method over a programmatic approach (where models orchestrate tools through code), despite the latter's success at Cloudflare.

MCP Tools Just Got 10x Faster In Claude Code

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