Model Context Protocol Specification

1. Architecture

   Hosts, clients and servers.

2. Lifecycle

   Initialization, capability negotiation and shutdown.

3. Transports

   stdio and Streamable HTTP transports.

4. Authorization

   OAuth 2.1 based authorization for HTTP transports.

5. Tools

   Tool listing, calling and results.

6. Resources

   Resource URIs, templates and subscriptions.

7. Prompts

   Prompt templates exposed to clients.

8. Sampling

   Server-initiated LLM requests.

9. Roots and elicitation

   Filesystem roots exposed by clients.

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