139 pages for listen.

TUI client Model Context Protocol · in the page docs/draft/tools/inspector/tui …n a browser. 3. When the browser redirect lands on the TUI's loopback listener, the connection finishes on its own, with no second **`c`**. 4. Use the **Auth** tab to inspect the resulting OAuth state… Web client Model Context Protocol · in the page docs/draft/tools/inspector/web …notifications/message` logs in panels below the frame. * The sandbox listens on its own port, `6275` by default (set it with `MCP_SANDBOX_PORT`). An app whose UI resource declares `_meta.ui.domain` h… Understanding Authorization in MCP Model Context Protocol · in the page docs/draft/tutorials/security/authorization …Request); app.delete("/", authMiddleware, handleSessionRequest); app.listen(CONFIG.port, CONFIG.host, () => { console.log(`🚀 MCP Server running on ${mcpServerUrl.origin}`); console.log(`📡 MCP end… Local Server Security Model Context Protocol · in the page docs/draft/tutorials/security/local-server-security …than connecting to a malicious endpoint, and local developer tools listening on a port have been exploited directly from a web page. Out of scope: attackers with physical access to your machine… Security Best Practices Model Context Protocol · in the page docs/draft/tutorials/security/security_best_practices …roves control of a domain, but it cannot prove which local process is listening on a `localhost` redirect URI. #### Attack Description An attacker can claim to be any client by: 1. Providing the le… Build an MCP App Model Context Protocol · in the page extensions/apps/build …await transport.handleRequest(req, res, req.body); }); expressApp.listen(3001, (err) => { if (err) { console.error("Error starting server:", err); process.exit(1); } console.log("Ser… Tasks Model Context Protocol · in the page extensions/tasks/overview …tifications/tasks`. Clients opt into these through the `subscriptions/listen` mechanism. Each notification carries the full task state, eliminating the need for an extra `tasks/get` round-trip. Polli… SEP-1686: Tasks Model Context Protocol · in the page seps/1686-tasks …esult> => { if (!onTaskStatus || !this.taskId) { // No task listener or task ID provided, just block for the result return await result; } // Whichever is successful first (or… SEP-2567: Sessionless MCP via Explicit State Handles Model Context Protocol · in the page seps/2567-sessionless-mcp …ifetime is tied to session lifetime. ([SEP-2575] introduces `messages/listen` as the delivery channel for server-to-client notifications; subscription lifetime under that model is not re-examined here… SEP-2575: Make MCP Stateless Model Context Protocol · in the page seps/2575-stateless-mcp …pabilities: ClientCapabilities; }; }; } ``` ### `subscriptions/listen` RPC This SEP introduces a new `subscriptions/listen` RPC that replaces the previous HTTP GET endpoint and ensures consist… SEP-2663: Tasks Extension Model Context Protocol · in the page seps/2663-tasks-extension …tions/tasks"; params: TaskStatusNotificationParams; } ``` To begin listening for task status notifications, clients send a `subscriptions/listen` request to the server including a list of task IDs… Transports Model Context Protocol · in the page specification/2025-03-26/basic/transports …ake the stream [resumable](#resumability-and-redelivery). ### Listening for Messages from the Server 1. The client **MAY** issue an HTTP GET to the MCP endpoint. This can be used to open an… Transports Model Context Protocol · in the page specification/2025-06-18/basic/transports …ake the stream [resumable](#resumability-and-redelivery). ### Listening for Messages from the Server 1. The client **MAY** issue an HTTP GET to the MCP endpoint. This can be used to open an… Transports Model Context Protocol · in the page specification/2025-11-25/basic/transports …ake the stream [resumable](#resumability-and-redelivery). ### Listening for Messages from the Server 1. The client **MAY** issue an HTTP GET to the MCP endpoint. This can be used to open an… Architecture Model Context Protocol · in the page specification/2026-07-28/architecture/index …end opt Subscriptions Client->>Server: subscriptions/listen (toolsListChanged, resourceSubscriptions, …) Server--)Client: notifications/subscriptions/acknowledged loop… Overview Model Context Protocol · in the page specification/2026-07-28/basic/index …tion or session continuity. Long-lived requests like [`subscriptions/listen`](/specification/2026-07-28/basic/patterns/subscriptions) remain request/response; the response is just an open stream of n… Cancellation Model Context Protocol · in the page specification/2026-07-28/basic/patterns/cancellation …**MUST** send `notifications/cancelled` referencing a `subscriptions/listen` request ID when it tears down that subscription stream (see [Subscriptions][subscriptions]). Servers **MUST NOT** send `no… Overview Model Context Protocol · in the page specification/2026-07-28/basic/patterns/index …(list changes, resource updates), the client sends a [`subscriptions/listen`](/specification/2026-07-28/basic/patterns/subscriptions) request; the reply is a long-lived stream of the requested notifi… Subscriptions Model Context Protocol · in the page specification/2026-07-28/basic/patterns/subscriptions # Subscriptions `subscriptions/listen` opens a long-lived notification stream from the server to the client. Unlike one-off requests, the stream stays open and delivers notifications until the client… stdio Model Context Protocol · in the page specification/2026-07-28/basic/transports/stdio …ssage`. 3. *Notifications* delivered for an active [`subscriptions/listen`][subscriptions-listen] request. Clients **MUST** correlate these using the `io.modelcontextprotocol/subscriptionId` fie… Streamable HTTP Model Context Protocol · in the page specification/2026-07-28/basic/transports/streamable-http …pdates) are delivered on the response stream of a [`subscriptions/listen`][subscriptions-listen] request. See [Message Flow](#message-flow) for sequence diagrams of these interactions. The serve… Key Changes Model Context Protocol · in the page specification/2026-07-28/changelog …and `resources/subscribe`/`resources/unsubscribe` with `subscriptions/listen`: a single long-lived POST-response stream for opted-in server-to-client change notifications. Clients opt in to specific t… Schema Reference Model Context Protocol · in the page specification/2026-07-28/schema …this key on every notification delivered via a <a href="#subscriptionslistenrequest" class="tsd-kind-interface">subscriptions/listen</a> stream, so the client can correlate the notification with the… Prompts Model Context Protocol · in the page specification/2026-07-28/server/prompts …D** send a notification to clients that have opened a [`subscriptions/listen`](/specification/2026-07-28/basic/patterns/subscriptions) stream with `promptsListChanged: true`: ```json theme={null} {… Resources Model Context Protocol · in the page specification/2026-07-28/server/resources …update notifications for resources requested through subscriptions/listen using the resourceSubscriptions filter. Servers may advertise either feature independently, together or neither. Server… Tools Model Context Protocol · in the page specification/2026-07-28/server/tools …D** send a notification to clients that have opened a [`subscriptions/listen`](/specification/2026-07-28/basic/patterns/subscriptions) stream with `toolsListChanged: true`: ```json theme={null} { "… Logging Model Context Protocol · in the page specification/2026-07-28/server/utilities/logging …quest-scoped: the server **MUST NOT** deliver it on a [`subscriptions/listen`](/specification/2026-07-28/basic/patterns/subscriptions) stream or on any stream other than the one carrying the response… Architecture Model Context Protocol · in the page specification/draft/architecture/index …end opt Subscriptions Client->>Server: subscriptions/listen (toolsListChanged, resourceSubscriptions, …) Server--)Client: notifications/subscriptions/acknowledged loop… Overview Model Context Protocol · in the page specification/draft/basic/index …tion or session continuity. Long-lived requests like [`subscriptions/listen`](/specification/draft/basic/patterns/subscriptions) remain request/response; the response is just an open stream of notifi… Cancellation Model Context Protocol · in the page specification/draft/basic/patterns/cancellation …**MUST** send `notifications/cancelled` referencing a `subscriptions/listen` request ID when it tears down that subscription stream (see [Subscriptions][subscriptions]). Servers **MUST NOT** send `no… Overview Model Context Protocol · in the page specification/draft/basic/patterns/index …(list changes, resource updates), the client sends a [`subscriptions/listen`](/specification/draft/basic/patterns/subscriptions) request; the reply is a long-lived stream of the requested notificatio… Subscriptions Model Context Protocol · in the page specification/draft/basic/patterns/subscriptions # Subscriptions `subscriptions/listen` opens a long-lived notification stream from the server to the client. Unlike one-off requests, the stream stays open and delivers notifications until the client… stdio Model Context Protocol · in the page specification/draft/basic/transports/stdio …ssage`. 3. *Notifications* delivered for an active [`subscriptions/listen`][subscriptions-listen] request. Clients **MUST** correlate these using the `io.modelcontextprotocol/subscriptionId` fie… Streamable HTTP Model Context Protocol · in the page specification/draft/basic/transports/streamable-http …pdates) are delivered on the response stream of a [`subscriptions/listen`][subscriptions-listen] request. See [Message Flow](#message-flow) for sequence diagrams of these interactions. The serve… Schema Reference Model Context Protocol · in the page specification/draft/schema …this key on every notification delivered via a <a href="#subscriptionslistenrequest" class="tsd-kind-interface">subscriptions/listen</a> stream, so the client can correlate the notification with the… Prompts Model Context Protocol · in the page specification/draft/server/prompts …D** send a notification to clients that have opened a [`subscriptions/listen`](/specification/draft/basic/patterns/subscriptions) stream with `promptsListChanged: true`: ```json theme={null} { "jso… Resources Model Context Protocol · in the page specification/draft/server/resources …update notifications for resources requested through subscriptions/listen using the resourceSubscriptions filter. Servers may advertise either feature independently, together or neither. Server… Tools Model Context Protocol · in the page specification/draft/server/tools …D** send a notification to clients that have opened a [`subscriptions/listen`](/specification/draft/basic/patterns/subscriptions) stream with `toolsListChanged: true`: ```json theme={null} { "jsonr… Logging Model Context Protocol · in the page specification/draft/server/utilities/logging …quest-scoped: the server **MUST NOT** deliver it on a [`subscriptions/listen`](/specification/draft/basic/patterns/subscriptions) stream or on any stream other than the one carrying the response to th…