593 pages for theme.

Cancellation Model Context Protocol · in the page specification/2026-07-28/basic/patterns/cancellation …* An optional reason string that can be logged or displayed ```json theme={null} { "jsonrpc": "2.0", "method": "notifications/cancelled", "params": { "requestId": "123", "reason": "Use… Overview Model Context Protocol · in the page specification/2026-07-28/basic/patterns/index …ge`](/specification/2026-07-28/server/utilities/logging). ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: request Server-->>Client: not… Multi Round-Trip Requests Model Context Protocol · in the page specification/2026-07-28/basic/patterns/mrtr …mplete the operation, and responds with the final result. ```mermaid theme={null} sequenceDiagram participant C as Client participant S as Server C->>S: client request (id: 1, request par… Progress Model Context Protocol · in the page specification/2026-07-28/basic/patterns/progress …means, but **MUST** be unique across all active requests. ```json theme={null} { "jsonrpc": "2.0", "id": 1, "method": "some_method", "params": { "_meta": { "progressToken": "abc1… Subscriptions Model Context Protocol · in the page specification/2026-07-28/basic/patterns/subscriptions …notification types the client has not explicitly requested. ```json theme={null} { "jsonrpc": "2.0", "id": 1, "method": "subscriptions/listen", "params": { "_meta": { "io.modelcont… Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …er to respond with a single JSON object or an SSE stream: ```mermaid theme={null} sequenceDiagram participant Client participant Server note over Client,Server: Simple response Clien… Versioning and Compatibility Model Context Protocol · in the page specification/2026-07-28/basic/versioning …the server accepts or rejects each request independently: ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: request (with `_meta`) alt se… Elicitation Model Context Protocol · in the page specification/2026-07-28/client/elicitation …io.modelcontextprotocol/clientCapabilities` on each request: ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "elicitation": { "form": {},… Roots Model Context Protocol · in the page specification/2026-07-28/client/roots …io.modelcontextprotocol/clientCapabilities` on each request: ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "roots": {} } } } ``` ## Protocol Mes… Sampling Model Context Protocol · in the page specification/2026-07-28/client/sampling …ol/clientCapabilities` on each request: **Basic sampling:** ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "sampling": {} } } } ``` **With tool… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …ture-symbol">;</span><br /> <a class="tsd-kind-property" href="#icon-theme">theme</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">"light"</span> <span class="tsd-sign… Discovery Model Context Protocol · in the page specification/2026-07-28/server/discover …uest carries no body parameters beyond the standard `_meta`: ```json theme={null} { "jsonrpc": "2.0", "id": "discover-1", "method": "server/discover", "params": { "_meta": { "io.mod… Prompts Model Context Protocol · in the page specification/2026-07-28/server/prompts …erResult`](/specification/2026-07-28/schema#discoverresult): ```json theme={null} { "capabilities": { "prompts": { "listChanged": true } } } ``` `listChanged` indicates whether the… Resources Model Context Protocol · in the page specification/2026-07-28/server/resources …pport resources **MUST** declare the `resources` capability: ```json theme={null} { "capabilities": { "resources": { "listChanged": true, "subscribe": true } } } ``` The capa… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …that support tools **MUST** declare the `tools` capability: ```json theme={null} { "capabilities": { "tools": { "listChanged": true } } } ``` `listChanged` indicates whether the s… Caching Model Context Protocol · in the page specification/2026-07-28/server/utilities/caching …d response and it should be considered immediately stale. ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: tools/list Server-->>Client:… Completion Model Context Protocol · in the page specification/2026-07-28/server/utilities/completion …t completions **MUST** declare the `completions` capability: ```json theme={null} { "capabilities": { "completions": {} } } ``` ## Protocol Messages ### Requesting Completions To get compl… Logging Model Context Protocol · in the page specification/2026-07-28/server/utilities/logging …age notifications **MUST** declare the `logging` capability: ```json theme={null} { "capabilities": { "logging": {} } } ``` ## Log Levels The protocol follows the standard syslog severity l… Pagination Model Context Protocol · in the page specification/2026-07-28/server/utilities/pagination …sults * An optional `nextCursor` field if more results exist ```json theme={null} { "jsonrpc": "2.0", "id": "123", "result": { "resultType": "complete", "resources": [...], "nextCur… Architecture Model Context Protocol · in the page specification/draft/architecture/index …dination between clients and servers. ## Core Components ```mermaid theme={null} graph LR subgraph "Application Host Process" H[Host] C1[Client 1] C2[Client 2] C3… Authorization Server Discovery Model Context Protocol · in the page specification/draft/basic/authorization/authorization-server-discovery …Diagram The following diagram outlines an example flow: ```mermaid theme={null} sequenceDiagram participant C as Client participant M as MCP Server (Resource Server) participant A as Au… Client Registration Model Context Protocol · in the page specification/draft/basic/authorization/client-registration …d-metadata-document-security) ### Example Metadata Document ```json theme={null} { "client_id": "https://app.example.com/oauth/client-metadata.json", "client_name": "Example MCP Client", "clie… Authorization Model Context Protocol · in the page specification/draft/basic/authorization/index …copes_supported`. Example 401 response with scope guidance: ```http theme={null} HTTP/1.1 401 Unauthorized WWW-Authenticate: Bearer resource_metadata="https://mcp.example.com/.well-known/oauth-prote… Overview Model Context Protocol · in the page specification/draft/basic/index …om the client to the server, to initiate an operation. ```typescript theme={null} { jsonrpc: "2.0"; id: string | number; method: string; params?: { [key: string]: unknown; }; } ``` * R… Cancellation Model Context Protocol · in the page specification/draft/basic/patterns/cancellation …* An optional reason string that can be logged or displayed ```json theme={null} { "jsonrpc": "2.0", "method": "notifications/cancelled", "params": { "requestId": "123", "reason": "Use… Overview Model Context Protocol · in the page specification/draft/basic/patterns/index …message`](/specification/draft/server/utilities/logging). ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: request Server-->>Client: not… Multi Round-Trip Requests Model Context Protocol · in the page specification/draft/basic/patterns/mrtr …mplete the operation, and responds with the final result. ```mermaid theme={null} sequenceDiagram participant C as Client participant S as Server C->>S: client request (id: 1, request par… Progress Model Context Protocol · in the page specification/draft/basic/patterns/progress …means, but **MUST** be unique across all active requests. ```json theme={null} { "jsonrpc": "2.0", "id": 1, "method": "some_method", "params": { "_meta": { "progressToken": "abc1… Subscriptions Model Context Protocol · in the page specification/draft/basic/patterns/subscriptions …notification types the client has not explicitly requested. ```json theme={null} { "jsonrpc": "2.0", "id": 1, "method": "subscriptions/listen", "params": { "_meta": { "io.modelcont… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …er to respond with a single JSON object or an SSE stream: ```mermaid theme={null} sequenceDiagram participant Client participant Server note over Client,Server: Simple response Clien… Versioning and Compatibility Model Context Protocol · in the page specification/draft/basic/versioning …the server accepts or rejects each request independently: ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: request (with `_meta`) alt se… Elicitation Model Context Protocol · in the page specification/draft/client/elicitation …io.modelcontextprotocol/clientCapabilities` on each request: ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "elicitation": { "form": {},… Roots Model Context Protocol · in the page specification/draft/client/roots …io.modelcontextprotocol/clientCapabilities` on each request: ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "roots": {} } } } ``` ## Protocol Mes… Sampling Model Context Protocol · in the page specification/draft/client/sampling …ol/clientCapabilities` on each request: **Basic sampling:** ```json theme={null} { "_meta": { "io.modelcontextprotocol/clientCapabilities": { "sampling": {} } } } ``` **With tool… Schema Reference Model Context Protocol · in the page specification/draft/schema …ture-symbol">;</span><br /> <a class="tsd-kind-property" href="#icon-theme">theme</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">"light"</span> <span class="tsd-sign… Discovery Model Context Protocol · in the page specification/draft/server/discover …uest carries no body parameters beyond the standard `_meta`: ```json theme={null} { "jsonrpc": "2.0", "id": "discover-1", "method": "server/discover", "params": { "_meta": { "io.mod… Prompts Model Context Protocol · in the page specification/draft/server/prompts …iscoverResult`](/specification/draft/schema#discoverresult): ```json theme={null} { "capabilities": { "prompts": { "listChanged": true } } } ``` `listChanged` indicates whether the… Resources Model Context Protocol · in the page specification/draft/server/resources …pport resources **MUST** declare the `resources` capability: ```json theme={null} { "capabilities": { "resources": { "listChanged": true, "subscribe": true } } } ``` The capa… Tools Model Context Protocol · in the page specification/draft/server/tools …that support tools **MUST** declare the `tools` capability: ```json theme={null} { "capabilities": { "tools": { "listChanged": true } } } ``` `listChanged` indicates whether the s… Caching Model Context Protocol · in the page specification/draft/server/utilities/caching …d response and it should be considered immediately stale. ```mermaid theme={null} sequenceDiagram participant Client participant Server Client->>Server: tools/list Server-->>Client:… Completion Model Context Protocol · in the page specification/draft/server/utilities/completion …t completions **MUST** declare the `completions` capability: ```json theme={null} { "capabilities": { "completions": {} } } ``` ## Protocol Messages ### Requesting Completions To get compl… Logging Model Context Protocol · in the page specification/draft/server/utilities/logging …age notifications **MUST** declare the `logging` capability: ```json theme={null} { "capabilities": { "logging": {} } } ``` ## Log Levels The protocol follows the standard syslog severity l… Pagination Model Context Protocol · in the page specification/draft/server/utilities/pagination …sults * An optional `nextCursor` field if more results exist ```json theme={null} { "jsonrpc": "2.0", "id": "123", "result": { "resultType": "complete", "resources": [...], "nextCur…