# Model Context Protocol (MCP)

> The open protocol connecting AI agents to tools, data, and prompts: architecture, transports, server/client capabilities, authorization, the SDKs, and how to build, connect, and publish MCP servers and clients.
> Covers: MCP as of spec 2025-11-25: the host/client/server architecture, stdio and Streamable HTTP transports, the initialize lifecycle, server primitives (resources, tools, prompts) and client capabilities (sampling, roots, elicitation), OAuth 2.1 authorization, protocol utilities, and how to build/connect/debug/publish servers and clients — plus the official Python and TypeScript SDKs, the MCP Inspector, and the official registry.
> Not covered: Individual third-party MCP servers and their specific tools/config; a given host app's MCP settings UI beyond how it connects; the exhaustive JSON field list of every message (read the spec/SDK types); draft SEP proposals. For those, see the server's own docs or modelcontextprotocol.io.
> Current as of: 2026-07-07 (2025-11-25)

- [LLM Wiki](/raw/mcp/README.md)
- [MCP Knowledge Base — Index](/raw/mcp/wiki/index.md)
- [MCP Architecture](/raw/mcp/wiki/concepts/architecture.md)
- [Authorization](/raw/mcp/wiki/concepts/authorization.md)
- [Building a Client](/raw/mcp/wiki/concepts/building-a-client.md)
- [Building a Server](/raw/mcp/wiki/concepts/building-a-server.md)
- [Connecting to Servers](/raw/mcp/wiki/concepts/connecting-to-servers.md)
- [Debugging](/raw/mcp/wiki/concepts/debugging.md)
- [Elicitation](/raw/mcp/wiki/concepts/elicitation.md)
- [MCP Lifecycle](/raw/mcp/wiki/concepts/lifecycle.md)
- [Prompts](/raw/mcp/wiki/concepts/prompts.md)
- [Protocol Utilities](/raw/mcp/wiki/concepts/protocol-utilities.md)
- [Resources](/raw/mcp/wiki/concepts/resources.md)
- [Roots](/raw/mcp/wiki/concepts/roots.md)
- [Sampling](/raw/mcp/wiki/concepts/sampling.md)
- [Security Best Practices](/raw/mcp/wiki/concepts/security-best-practices.md)
- [Tools](/raw/mcp/wiki/concepts/tools.md)
- [MCP Transports](/raw/mcp/wiki/concepts/transports.md)
- [MCP Versioning](/raw/mcp/wiki/concepts/versioning.md)
- [What Is MCP](/raw/mcp/wiki/concepts/what-is-mcp.md)
- [MCP Apps](/raw/mcp/wiki/entities/mcp-apps.md)
- [MCP Inspector](/raw/mcp/wiki/entities/mcp-inspector.md)
- [The MCP Registry](/raw/mcp/wiki/entities/mcp-registry.md)
- [Publishing to the MCP Registry](/raw/mcp/wiki/entities/publishing-to-registry.md)
- [MCP Python SDK](/raw/mcp/wiki/entities/python-sdk.md)
- [MCP TypeScript SDK](/raw/mcp/wiki/entities/typescript-sdk.md)
- [Activity Log](/raw/mcp/wiki/log.md)
- [Local vs Remote MCP Servers](/raw/mcp/wiki/syntheses/local-vs-remote-servers.md)
- [Server Feature Picker: Resources vs Tools vs Prompts (and Sampling/Elicitation)](/raw/mcp/wiki/syntheses/server-feature-picker.md)
- [Transport Decision: stdio vs Streamable HTTP](/raw/mcp/wiki/syntheses/transport-decision.md)