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MCP is an open protocol for connecting LLMs to tools and data
Model Context Protocol (MCP) is an open Apache 2.0 standard for LLM hosts to access tools, resources, and prompts via JSON-RPC.
MCP uses JSON-RPC 2.0 for all messages
Every MCP message is a JSON-RPC 2.0 object — request, response, notification, or error — sent newline-delimited over the transport.
MCP servers expose tools, resources, and prompts
MCP defines three capability primitives — Tools (callable functions), Resources (readable URIs), and Prompts (reusable templates).