762 pages for error.

Roots Model Context Protocol · in the page specification/draft/client/roots …e/user/repos/backend", "name": "Backend Repository" } ] ``` ## Error Handling If an error occurs, the client does not need to replay the initial call with an error message as the server is not… Sampling Model Context Protocol · in the page specification/draft/client/sampling …ached. * `"toolUse"`: The model wants to use one or more tools. ## Error Handling If an error occurs or the user declines the sampling request, the client does not need to replay the initial call… Specification Model Context Protocol · in the page specification/draft/index …ional Utilities * Configuration * Progress tracking * Cancellation * Error reporting ### Extensions Beyond the core protocol, MCP defines optional [extensions](/extensions/overview) that add modula… Schema Reference Model Context Protocol · in the page specification/draft/schema …="schema-reference" /> ## JSON-RPC <div class="type"> ### `JSONRPCErrorResponse` <div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface"… Discovery Model Context Protocol · in the page specification/draft/server/discover …ient may invoke any RPC inline and handle [`UnsupportedProtocolVersionError`](/specification/draft/schema#unsupportedprotocolversionerror) if the server does not support the requested version. However… Prompts Model Context Protocol · in the page specification/draft/server/prompts …or other reference materials directly into the conversation flow. ## Error Handling Servers **SHOULD** return standard JSON-RPC errors for common failure cases: * Invalid prompt name: `-32602` (Inv… Resources Model Context Protocol · in the page specification/draft/server/resources …f.org/doc/html/rfc3986), taking the above guidance in to account. ## Error Handling If the requested resource does not exist, servers **MUST** return a JSON-RPC error with code `-32602` (Invalid Par… Tools Model Context Protocol · in the page specification/draft/server/tools …\nTemperature: 72°F\nConditions: Partly cloudy" } ], "isError": false } } ``` ### Input Required Tool Results Servers **MAY** respond to `tools/call` with an [`InputRequiredResult`](… Caching Model Context Protocol · in the page specification/draft/server/utilities/caching …reason to believe the data has changed (e.g., receiving an unexpected error on a tool call indicating the method was not found or the parameters were invalid). Clients **MAY** serve stale responses i… Completion Model Context Protocol · in the page specification/draft/server/utilities/completion …l`: Optional total matches * `hasMore`: Additional results flag ## Error Handling Servers **SHOULD** return standard JSON-RPC errors for common failure cases: * Method not found: `-32601` (Capabi… Logging Model Context Protocol · in the page specification/draft/server/utilities/logging …| Warning conditions | Deprecated feature usage | | error | Error conditions | Operation failures | | critical | Critical conditions | Syste… Pagination Model Context Protocol · in the page specification/draft/server/utilities/pagination …rsor and thus **MUST NOT** be treated as the end of results) ## Error Handling Invalid cursors **SHOULD** result in an error with code -32602 (Invalid params).