220 pages for reported.

SEP-1303: Input Validation Errors as Tool Execution Errors Model Context Protocol · in the page seps/1303-input-validation-errors-as-tool-execution-errors …- Unknown tools - Server errors 2. **Tool Execution Errors**: Reported in tool results with `isError: true`: - API failures - Input validation errors - Business logic errors ``` ## I… SEP-1686: Tasks Model Context Protocol · in the page seps/1686-tasks …*Task Execution Errors**: Errors in the underlying request execution, reported through task status #### 7.1. Protocol Errors Receivers **MUST** return standard JSON-RPC errors for the following prot… SEP-1730: SDKs Tiering System Model Context Protocol · in the page seps/1730-sdks-tiering-system …pport stats** | 10 days | 100 days | 5 days | | **Documentation (self reported)** | Good | Minimal | Good | | **Tier (computed from above)** | Tier 2 | Tier 3 | Tier 1 | ## Rationale ### Why Three T… SEP-2207: OIDC-Flavored Refresh Token Guidance Model Context Protocol · in the page seps/2207-oidc-refresh-token-guidance …nt metadata may not be sufficient**: Since client metadata is self-reported, a malicious actor could register a client claiming `refresh_token` grant support to obtain long-lived tokens. Authori… SEP-2640: Skills Extension Model Context Protocol · in the page seps/2640-skills-extension …MUST identify servers by a host-assigned label, not the server's self-reported `serverInfo.name`. Any cross-origin read MUST be gated behind explicit per-call user approval naming both servers. * **Na… SEP-2663: Tasks Extension Model Context Protocol · in the page seps/2663-tasks-extension …*Task Execution Errors**: Errors in the underlying request execution, reported through task status #### Protocol Errors Servers **MUST** return standard JSON-RPC errors for the following protocol er… Tools Model Context Protocol · in the page specification/2024-11-05/server/tools …* Invalid arguments * Server errors 2. **Tool Execution Errors**: Reported in tool results with `isError: true`: * API failures * Invalid input data * Business logic errors Example proto… Tools Model Context Protocol · in the page specification/2025-03-26/server/tools …* Invalid arguments * Server errors 2. **Tool Execution Errors**: Reported in tool results with `isError: true`: * API failures * Invalid input data * Business logic errors Example proto… Schema Reference Model Context Protocol · in the page specification/2025-06-18/schema …successful).</p> <p>Any errors that originate from the tool SHOULD be reported inside the result object, with <code>isError</code> set to true, <em>not</em> as an MCP protocol-level error response… Tools Model Context Protocol · in the page specification/2025-06-18/server/tools …* Invalid arguments * Server errors 2. **Tool Execution Errors**: Reported in tool results with `isError: true`: * API failures * Invalid input data * Business logic errors Example proto… Tasks Model Context Protocol · in the page specification/2025-11-25/basic/utilities/tasks …*Task Execution Errors**: Errors in the underlying request execution, reported through task status ### Protocol Errors Receivers **MUST** return standard JSON-RPC errors for the following protocol e… Tools Model Context Protocol · in the page specification/2025-11-25/server/tools …a#calltoolrequest)) * Server errors 2. **Tool Execution Errors**: Reported in tool results with `isError: true`: * API failures * Input validation errors (e.g., date in wrong format, value o… Overview Model Context Protocol · in the page specification/2026-07-28/basic/index …tocol/clientInfo` and `io.modelcontextprotocol/serverInfo` > are self-reported by the sender and are not verified by the protocol. They are > intended for display, logging, and debugging. Implementati… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …version</code>; other fields are optional.</p> <p>The value is self-reported by the client and is not verified by the protocol. It is intended for display, logging, and debugging. Servers SHOULD… Discovery Model Context Protocol · in the page specification/2026-07-28/server/discover …to use this server effectively > [!NOTE] > > `serverInfo` is self-reported by the server and is not verified by the > protocol. It is intended for display, logging, and debugging. Clients **SHOULD… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …g format, value out of range) * Business logic errors They are reported in tool results with `isError: true`: ```json theme={null} { "jsonrpc": "2.0", "id": 4, "result": {… Overview Model Context Protocol · in the page specification/draft/basic/index …tocol/clientInfo` and `io.modelcontextprotocol/serverInfo` > are self-reported by the sender and are not verified by the protocol. They are > intended for display, logging, and debugging. Implementati… Schema Reference Model Context Protocol · in the page specification/draft/schema …version</code>; other fields are optional.</p> <p>The value is self-reported by the client and is not verified by the protocol. It is intended for display, logging, and debugging. Servers SHOULD… Discovery Model Context Protocol · in the page specification/draft/server/discover …to use this server effectively > [!NOTE] > > `serverInfo` is self-reported by the server and is not verified by the > protocol. It is intended for display, logging, and debugging. Clients **SHOULD… Tools Model Context Protocol · in the page specification/draft/server/tools …g format, value out of range) * Business logic errors They are reported in tool results with `isError: true`: ```json theme={null} { "jsonrpc": "2.0", "id": 4, "result": {…