MCP Server Foundations

Understanding the architecture, lifecycle, and transports of the Model Context Protocol (MCP).

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MCP Server Foundations

The Model Context Protocol (MCP) is the standard for connecting AI models to external tools and data.

Architecture

  • Host: The application (like Claude Desktop) that initiates the connection.
  • Server: The adapter providing tools, resources, or prompts.
  • Client: The model's interface within the host.

Transports

  • STDIO: Standard input/output for local processes.
  • SSE (Server-Sent Events): For remote servers over HTTP.

Lifecycle

  1. Initialization: Capabilities negotiation.
  2. Interaction: Tool calls, resource reads.
  3. Shutdown: Cleanly closing connections.

Best Practices

  • Graceful Error Handling: Returning clear error messages instead of crashing.
  • Resource Management: Efficiently closing file handles and network sockets.

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