modelcontextprotocol

Why we included this project

Before wiring an AI application to external tools, files, and databases, it pays to read the protocol definition most of the ecosystem now implements. This repo is the canonical home of that standard: the spec, the versioned TypeScript and JSON schemas, and the official documentation covering the architecture, message patterns, authorization, and transports. It is not deployable software, so don't expect a runnable service; its value is as the reference you consult when building an MCP server or client, or when deciding which community SDK to trust. Teams standardizing on one interface for tool calls, or checking how a vendor's implementation deviates from the spec, will find this the authoritative baseline. Because the protocol ships in dated releases, following this repo keeps your integration decisions aligned with what assistants and coding tools actually ship.