Simon Willison • 11/5/2025

Code execution with MCP: Building more efficient agents

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The article analyzes Anthropic's proposal to improve Model Context Protocol (MCP) by converting MCP tools into TypeScript code functions. This approach addresses two key MCP limitations: reducing context token usage by storing tool definitions as files, and enabling direct code execution to avoid round-tripping data through the LLM. The method promises faster, more reliable agent performance while protecting sensitive data, though implementation details are left to the community.

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#TypeScript #mcp #API Integration
Code execution with MCP: Building more efficient agents

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