Anthropic's Tool Search Tool: How 85% Context Savings Changes Agent Architecture in 2026
Anthropic's Tool Search Tool, shipped to GA on August 19, 2026, fundamentally changes how agents consume tool definitions. Instead of loading all 50+ MCP tool definitions upfront (consuming 72K+ tokens), agents discover tools on-demand, loading only the 3-5 relevant definitions. Opus 4 accuracy improved from 49% to 74% on MCP evaluations.