674 pages for detail.

Specification Model Context Protocol · in the page specification/2025-11-25/index …onal context and tools into the ecosystem of AI applications. ## Key Details ### Base Protocol * [JSON-RPC](https://www.jsonrpc.org/) message format * Stateful connections * Server and client capab… Schema Reference Model Context Protocol · in the page specification/2025-11-25/schema …ut the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).</p> </div></section> </div> <div class="type"> ### `Icon` <div class="tsd-s… Overview Model Context Protocol · in the page specification/2025-11-25/server/index …I POST requests, file writing | Explore these key primitives in more detail below: > [card] [Prompts](https://modelcontextprotocol.io/specification/2025-11-25/server/prompts.md) > [card] [Resources… Logging Model Context Protocol · in the page specification/2025-11-25/server/utilities/logging …: | Level | Description | Example Use Case | | - | - | - | | debug | Detailed debugging information | Function entry/exit points | | info | General informational messages | Operation progress updates… Authorization Server Discovery Model Context Protocol · in the page specification/2026-07-28/basic/authorization/authorization-server-discovery …atatracker.ietf.org/doc/html/rfc9728)) for guidance on implementation details. Implementors should note that Protected Resource Metadata documents can define multiple authorization servers. The respo… Client Registration Model Context Protocol · in the page specification/2026-07-28/basic/authorization/client-registration …n server, or 2. Present a UI to users that allows them to enter these details, after registering an OAuth client themselves (e.g., through a configuration interface hosted by the server). ## Dy… Authorization Model Context Protocol · in the page specification/2026-07-28/basic/authorization/index …d issuing access tokens for use at the MCP server. The implementation details of the authorization server are beyond the scope of this specification. It may be hosted with the resource server or a sep… Authorization Security Considerations Model Context Protocol · in the page specification/2026-07-28/basic/authorization/security-considerations …s), authorization servers **MUST** consider the security implications detailed in [OAuth Client ID Metadata Document, Section 6](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-client-id-metada… Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …he tool's `inputSchema`. See [Tool Definitions][tool-definitions] for details on how to annotate tool parameters. While the use of `x-mcp-header` is optional for servers, clients **MUST** support thi… Elicitation Model Context Protocol · in the page specification/2026-07-28/client/elicitation …r the `url` field in a URL elicitation request (with the restrictions detailed above). ### Identifying the User Servers **MUST NOT** rely on client-provided user identification without server verifi… Specification Model Context Protocol · in the page specification/2026-07-28/index …onal context and tools into the ecosystem of AI applications. ## Key Details ### Base Protocol * [JSON-RPC](https://www.jsonrpc.org/) message format * Stateless, self-contained requests * Per-reque… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …28/basic/index#meta">General fields: <code>\_meta</code></a> for more details.</p> </div></div> </div> <div class="type"> ### `NotificationMetaObject` <div class="tsd-signature"><span class="tsd… Overview Model Context Protocol · in the page specification/2026-07-28/server/index …I POST requests, file writing | Explore these key primitives in more detail below: > [card] [Prompts](https://modelcontextprotocol.io/specification/2026-07-28/server/prompts.md) > [card] [Resources… Logging Model Context Protocol · in the page specification/2026-07-28/server/utilities/logging …: | Level | Description | Example Use Case | | - | - | - | | debug | Detailed debugging information | Function entry/exit points | | info | General informational messages | Operation progress updates… Authorization Server Discovery Model Context Protocol · in the page specification/draft/basic/authorization/authorization-server-discovery …atatracker.ietf.org/doc/html/rfc9728)) for guidance on implementation details. Implementors should note that Protected Resource Metadata documents can define multiple authorization servers. The respo… Client Registration Model Context Protocol · in the page specification/draft/basic/authorization/client-registration …n server, or 2. Present a UI to users that allows them to enter these details, after registering an OAuth client themselves (e.g., through a configuration interface hosted by the server). ## Dy… Authorization Model Context Protocol · in the page specification/draft/basic/authorization/index …d issuing access tokens for use at the MCP server. The implementation details of the authorization server are beyond the scope of this specification. It may be hosted with the resource server or a sep… Authorization Security Considerations Model Context Protocol · in the page specification/draft/basic/authorization/security-considerations …s), authorization servers **MUST** consider the security implications detailed in [OAuth Client ID Metadata Document, Section 10](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-client-id-metad… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …he tool's `inputSchema`. See [Tool Definitions][tool-definitions] for details on how to annotate tool parameters. While the use of `x-mcp-header` is optional for servers, clients **MUST** support thi… Elicitation Model Context Protocol · in the page specification/draft/client/elicitation …r the `url` field in a URL elicitation request (with the restrictions detailed above). ### Identifying the User Servers **MUST NOT** rely on client-provided user identification without server verifi… Specification Model Context Protocol · in the page specification/draft/index …onal context and tools into the ecosystem of AI applications. ## Key Details ### Base Protocol * [JSON-RPC](https://www.jsonrpc.org/) message format * Stateless, self-contained requests * Per-reque… Schema Reference Model Context Protocol · in the page specification/draft/schema …ft/basic/index#meta">General fields: <code>\_meta</code></a> for more details.</p> </div></div> </div> <div class="type"> ### `NotificationMetaObject` <div class="tsd-signature"><span class="tsd… Overview Model Context Protocol · in the page specification/draft/server/index …I POST requests, file writing | Explore these key primitives in more detail below: > [card] [Prompts](https://modelcontextprotocol.io/specification/draft/server/prompts.md) > [card] [Resources](htt… Logging Model Context Protocol · in the page specification/draft/server/utilities/logging …: | Level | Description | Example Use Case | | - | - | - | | debug | Detailed debugging information | Function entry/exit points | | info | General informational messages | Operation progress updates…