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Model Context Protocol — a standard for connecting AI models to external tools.
MCP defines how a host (like Claude Code) discovers and calls tools provided by a separate server process. Tool schemas are described in JSON so any compliant model can understand what each tool does and what arguments it expects. Smithery is the community registry where developers publish and find MCP servers.
Plainly
Think of MCP as a tool from the builder toolbox. Model Context Protocol — a standard for connecting AI models to external tools.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.