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How to Build a Zero-Dependency MCP Server Using Only Python's Standard Library

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The Model Context Protocol (MCP), Anthropic's open standard for connecting AI assistants to external tools, is typically implemented via an official SDK that installs 47 packages. A new technical guide demonstrates how to build a fully functional MCP server using only Python's built-in standard library modules, with no third-party dependencies. The approach is aimed at developers working in sandboxed corporate environments, air-gapped systems, or security-sensitive deployments where a large dependency tree poses supply-chain risks. The implementation covers the three core MCP capabilities — tools, resources, and prompts — communicated over a JSON-RPC 2.0 stdio transport using newline-delimited JSON. Beyond practical deployment benefits, the method also serves an educational purpose by making the underlying protocol transparent rather than abstracted away by an SDK.

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