188 pages for notifications.

Elicitation Model Context Protocol · in the page specification/2025-11-25/client/elicitation …he server sends a notification indicating completion. ### Completion Notifications for URL Mode Elicitation Servers **MAY** send a `notifications/elicitation/complete` notification when an out-of-ba… Roots Model Context Protocol · in the page specification/2025-11-25/client/roots …ers can request the list of roots from supporting clients and receive notifications when that list changes. ## User Interaction Model Roots in MCP are typically exposed through workspace or project… Schema Reference Model Context Protocol · in the page specification/2025-11-25/schema …mment tsd-typography"><p>A progress token, used to associate progress notifications with the original request.</p> </div> </div> <div class="type"> ### `RequestId` <div class="tsd-signature"><sp… Prompts Model Context Protocol · in the page specification/2025-11-25/server/prompts …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available prompts changes. ## Protocol Messages ### Listing Prompts To retrieve available prompt… Resources Model Context Protocol · in the page specification/2025-11-25/server/resources …individual resources. * `listChanged`: whether the server will emit notifications when the list of available resources changes. Both `subscribe` and `listChanged` are optional—servers can support… Tools Model Context Protocol · in the page specification/2025-11-25/server/tools …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available tools changes. ## Protocol Messages ### Listing Tools To discover available tools, cli… Logging Model Context Protocol · in the page specification/2025-11-25/server/utilities/logging …logging verbosity by setting minimum log levels, with servers sending notifications containing severity levels, optional logger names, and arbitrary JSON-serializable data. ## User Interaction Model… Architecture Model Context Protocol · in the page specification/2026-07-28/architecture/index …Routes protocol messages bidirectionally * Manages subscriptions and notifications * Maintains security boundaries between servers A host application creates and manages multiple clients, with each… Overview Model Context Protocol · in the page specification/2026-07-28/basic/index …f the integer space is available for application-defined errors. ### Notifications [Notifications](https://modelcontextprotocol.io/specification/2026-07-28/schema.md#jsonrpcnotification) are sent fr… Cancellation Model Context Protocol · in the page specification/2026-07-28/basic/patterns/cancellation …t it previously issued should be terminated. A server **MUST** send `notifications/cancelled` referencing a `subscriptions/listen` request ID when it tears down that subscription stream (see [Subscri… Overview Model Context Protocol · in the page specification/2026-07-28/basic/patterns/index …e ways a client and server compose JSON-RPC [requests, responses, and notifications](https://modelcontextprotocol.io/specification/2026-07-28/basic/index.md#messages) into interactions. Every [transpo… Progress Model Context Protocol · in the page specification/2026-07-28/basic/patterns/progress …tions through notification messages. The server **MAY** send progress notifications to report the status of requests the client has issued. ## Progress Flow When a client wants to *receive* progress… Subscriptions Model Context Protocol · in the page specification/2026-07-28/basic/patterns/subscriptions …e client. Unlike one-off requests, the stream stays open and delivers notifications until the client cancels it. It replaces the former `resources/subscribe` RPC and the HTTP GET endpoint. ## Opening… Overview Model Context Protocol · in the page specification/2026-07-28/basic/transports/index …TF-8 encoded. A binding **MUST** deliver client-sent *requests* and *notifications* to the server, and server-sent *responses* and *notifications* to the client. No other message direction exists: pe… stdio Model Context Protocol · in the page specification/2026-07-28/basic/transports/stdio …ssages The client sends messages by writing JSON-RPC *requests* and *notifications* to the server's `stdin`, one message per line. The client **MUST NOT** write JSON-RPC *responses*. ## Receiving Me… Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …[sse] (SSE) stream scoped to that request, carrying request-related notifications followed by the final response. * Server-to-client interactions (sampling, elicitation, roots) are embedded in res… Key Changes Model Context Protocol · in the page specification/2026-07-28/changelog …rotocol/pull/2567)). 2. Make MCP stateless: remove the `initialize`/`notifications/initialized` handshake. Every request now carries its protocol version and client capabilities in `_meta` (`io.model… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …otification with the originating subscription. The key is absent on notifications not delivered via a subscription stream (e.g. progress notifications for an in-flight request), which is why it… Prompts Model Context Protocol · in the page specification/2026-07-28/server/prompts …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available prompts changes. Servers that declare the `prompts` capability **MUST** respond to `prom… Resources Model Context Protocol · in the page specification/2026-07-28/server/resources …two optional features: * `listChanged`: whether the server will emit notifications when the list of available resources changes. * `subscribe` : whether the server supports resource-specific update… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available tools changes. Servers that declare the `tools` capability **MUST** respond to `tools/li… Caching Model Context Protocol · in the page specification/2026-07-28/server/utilities/caching …d reduce unnecessary re-fetching. Caching is complementary to [change notifications](#interaction-with-notifications)—both mechanisms can coexist. ## Cacheable Results Servers MUST include caching h… Logging Model Context Protocol · in the page specification/2026-07-28/server/utilities/logging …ntrol logging verbosity per-request via `_meta`, with servers sending notifications containing severity levels, optional logger names, and arbitrary JSON-serializable data. ## User Interaction Model… Architecture Model Context Protocol · in the page specification/draft/architecture/index …Routes protocol messages bidirectionally * Manages subscriptions and notifications * Maintains security boundaries between servers A host application creates and manages multiple clients, with each… Overview Model Context Protocol · in the page specification/draft/basic/index …f the integer space is available for application-defined errors. ### Notifications [Notifications](https://modelcontextprotocol.io/specification/draft/schema.md#jsonrpcnotification) are sent from th… Cancellation Model Context Protocol · in the page specification/draft/basic/patterns/cancellation …t it previously issued should be terminated. A server **MUST** send `notifications/cancelled` referencing a `subscriptions/listen` request ID when it tears down that subscription stream (see [Subscri… Overview Model Context Protocol · in the page specification/draft/basic/patterns/index …e ways a client and server compose JSON-RPC [requests, responses, and notifications](https://modelcontextprotocol.io/specification/draft/basic/index.md#messages) into interactions. Every [transport](h… Progress Model Context Protocol · in the page specification/draft/basic/patterns/progress …tions through notification messages. The server **MAY** send progress notifications to report the status of requests the client has issued. ## Progress Flow When a client wants to *receive* progress… Subscriptions Model Context Protocol · in the page specification/draft/basic/patterns/subscriptions …e client. Unlike one-off requests, the stream stays open and delivers notifications until the client cancels it. It replaces the former `resources/subscribe` RPC and the HTTP GET endpoint. ## Opening… Overview Model Context Protocol · in the page specification/draft/basic/transports/index …TF-8 encoded. A binding **MUST** deliver client-sent *requests* and *notifications* to the server, and server-sent *responses* and *notifications* to the client. No other message direction exists: pe… stdio Model Context Protocol · in the page specification/draft/basic/transports/stdio …ssages The client sends messages by writing JSON-RPC *requests* and *notifications* to the server's `stdin`, one message per line. The client **MUST NOT** write JSON-RPC *responses*. ## Receiving Me… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …[sse] (SSE) stream scoped to that request, carrying request-related notifications followed by the final response. * Server-to-client interactions (sampling, elicitation, roots) are embedded in res… Schema Reference Model Context Protocol · in the page specification/draft/schema …otification with the originating subscription. The key is absent on notifications not delivered via a subscription stream (e.g. progress notifications for an in-flight request), which is why it… Prompts Model Context Protocol · in the page specification/draft/server/prompts …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available prompts changes. Servers that declare the `prompts` capability **MUST** respond to `prom… Resources Model Context Protocol · in the page specification/draft/server/resources …two optional features: * `listChanged`: whether the server will emit notifications when the list of available resources changes. * `subscribe` : whether the server supports resource-specific update… Tools Model Context Protocol · in the page specification/draft/server/tools …} } } ``` `listChanged` indicates whether the server will emit notifications when the list of available tools changes. Servers that declare the `tools` capability **MUST** respond to `tools/li… Caching Model Context Protocol · in the page specification/draft/server/utilities/caching …d reduce unnecessary re-fetching. Caching is complementary to [change notifications](#interaction-with-notifications)—both mechanisms can coexist. ## Cacheable Results Servers MUST include caching h… Logging Model Context Protocol · in the page specification/draft/server/utilities/logging …ntrol logging verbosity per-request via `_meta`, with servers sending notifications containing severity levels, optional logger names, and arbitrary JSON-serializable data. ## User Interaction Model…