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felixweinberger merged 4 commits into from
Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks #2128

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adb443e
[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…
felixweinberger May 19, 2026
65dcf1e
address review: remove task mappings from codemod, drop orphaned chan…
felixweinberger Jun 2, 2026
8064c37
address deletion-audit findings: scrub planning vocabulary, fix phant…
felixweinberger Jun 2, 2026
b1ada31
Merge branch 'main' into fweinberger/v2-tasks-delete
felixweinberger Jun 2, 2026
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5 changes: 0 additions & 5 deletions .changeset/fix-failed-task-result-retrieval.md
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6 changes: 6 additions & 0 deletions .changeset/sep-2663-tasks-removal.md
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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions CLAUDE.md
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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
- `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
- `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down
16 changes: 2 additions & 14 deletions docs/client.md
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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
const result = await client.callTool(
{ name: 'slow-task', arguments: {} },
{ name: 'slow-operation', arguments: {} },
{ timeout: 120_000 } // 2 minutes instead of the default 60 seconds
);
console.log(result.content);
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Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
{
method: 'tools/call',
params: { name: 'long-running-task', arguments: {} }
params: { name: 'long-running-operation', arguments: {} }
},
{
resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down
143 changes: 72 additions & 71 deletions docs/migration-SKILL.md
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13 changes: 0 additions & 13 deletions docs/server.md
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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down
23 changes: 11 additions & 12 deletions examples/client/README.md
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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down
4 changes: 2 additions & 2 deletions examples/client/src/clientGuide.examples.ts
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Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
//#region errorHandling_timeout
try {
const result = await client.callTool(
{ name: 'slow-task', arguments: {} },
{ name: 'slow-operation', arguments: {} },
{ timeout: 120_000 } // 2 minutes instead of the default 60 seconds
);
console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
const result = await client.request(
{
method: 'tools/call',
params: { name: 'long-running-task', arguments: {} }
params: { name: 'long-running-operation', arguments: {} }
},
{
resumptionToken: lastToken,
Expand Down
67 changes: 8 additions & 59 deletions examples/client/src/simpleOAuthClient.ts
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Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
console.log('Commands:');
console.log(' list - List available tools');
console.log(' call <tool_name> [args] - Call a tool');
console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
console.log(' quit - Exit the client');
console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
} else if (command.startsWith('stream ')) {
await this.handleStreamTool(command);
} else {
console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
}
} catch (error) {
if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
return;
}

try {
// Using the experimental tasks API - WARNING: may change without notice
console.log(`\n🔧 Streaming tool '${toolName}'...`);

const stream = this.client.experimental.tasks.callToolStream(
{
name: toolName,
arguments: toolArgs
},
{
task: {
taskId: `task-${Date.now()}`,
ttl: 60_000
}
}
);

// Iterate through all messages yielded by the generator
for await (const message of stream) {
switch (message.type) {
case 'taskCreated': {
console.log(`✓ Task created: ${message.task.taskId}`);
break;
}

case 'taskStatus': {
console.log(`⟳ Status: ${message.task.status}`);
if (message.task.statusMessage) {
console.log(` ${message.task.statusMessage}`);
}
break;
}

case 'result': {
console.log('✓ Completed!');
const toolResult = message.result as CallToolResult;
for (const content of toolResult.content) {
if (content.type === 'text') {
console.log(content.text);
} else {
console.log(content);
}
}
break;
}

case 'error': {
console.log('✗ Error:');
console.log(` ${message.error.message}`);
break;
}
}
}
} catch (error) {
console.error(`❌ Failed to stream tool '${toolName}':`, error);
}
// The streaming-tool demo (callToolStream) was removed with the 2025-11
// experimental tasks (SEP-2663); it returns when the tasks extension lands.
void toolName;
void toolArgs;
console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
}

close(): void {
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[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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felixweinberger
merged 4 commits into

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Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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5 changes: 0 additions & 5 deletions
.changeset/fix-failed-task-result-retrieval.md

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Comment thread
claude[bot] marked this conversation as resolved.

Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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docs/migration-SKILL.md

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docs/server.md

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

23 changes: 11 additions & 12 deletions
examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down

4 changes: 2 additions & 2 deletions
examples/client/src/clientGuide.examples.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

67 changes: 8 additions & 59 deletions
examples/client/src/simpleOAuthClient.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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felixweinberger
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Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
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claude[bot] marked this conversation as resolved.

Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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docs/migration-SKILL.md

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docs/server.md

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

23 changes: 11 additions & 12 deletions
examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down

4 changes: 2 additions & 2 deletions
examples/client/src/clientGuide.examples.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

67 changes: 8 additions & 59 deletions
examples/client/src/simpleOAuthClient.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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 Merged

felixweinberger
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Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Comment thread
claude[bot] marked this conversation as resolved.

Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

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examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

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examples/client/src/clientGuide.examples.ts

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Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

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examples/client/src/simpleOAuthClient.ts

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Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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felixweinberger
merged 4 commits into

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Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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.changeset/fix-failed-task-result-retrieval.md

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.changeset/sep-2663-tasks-removal.md

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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

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docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
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Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

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examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

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examples/client/src/clientGuide.examples.ts

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Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

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examples/client/src/simpleOAuthClient.ts

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Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


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address review: remove task mappings from codemod, drop orphaned chan…


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8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


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Merge branch 'main' into fweinberger/v2-tasks-delete


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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
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Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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docs/server.md

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

23 changes: 11 additions & 12 deletions
examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down

4 changes: 2 additions & 2 deletions
examples/client/src/clientGuide.examples.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

67 changes: 8 additions & 59 deletions
examples/client/src/simpleOAuthClient.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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 Merged

felixweinberger
merged 4 commits into

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Jun 2, 2026
 Merged


[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Comment thread
claude[bot] marked this conversation as resolved.

Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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docs/server.md

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

23 changes: 11 additions & 12 deletions
examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down

4 changes: 2 additions & 2 deletions
examples/client/src/clientGuide.examples.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

67 changes: 8 additions & 59 deletions
examples/client/src/simpleOAuthClient.ts

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Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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/* Selection */
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[SEP-2663] refactor!: remove 2025-11 experimental tasks by felixweinberger · Pull Request #2128 · modelcontextprotocol/typescript-sdk · GitHub
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[SEP-2663] refactor!: remove 2025-11 experimental tasks#2128

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felixweinberger
merged 4 commits into

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Jun 2, 2026
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[SEP-2663] refactor!: remove 2025-11 experimental tasks
#2128
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adb443e

[SEP-2663] refactor!: remove 2025-11 experimental tasks (impl + refer…


felixweinberger May 19, 2026
65dcf1e

address review: remove task mappings from codemod, drop orphaned chan…


felixweinberger Jun 2, 2026
8064c37

address deletion-audit findings: scrub planning vocabulary, fix phant…


felixweinberger Jun 2, 2026
b1ada31

Merge branch 'main' into fweinberger/v2-tasks-delete


felixweinberger Jun 2, 2026

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5 changes: 0 additions & 5 deletions
.changeset/fix-failed-task-result-retrieval.md

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.changeset/sep-2663-tasks-removal.md

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@@ -0,0 +1,6 @@
---
'@modelcontextprotocol/core': major
'@modelcontextprotocol/server': major
'@modelcontextprotocol/client': major
---
SEP-2663: remove 2025-11 experimental tasks (TaskManager, experimental.tasks.* accessors). Tasks are now Extensions Track.
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5 changes: 1 addition & 4 deletions
CLAUDE.md

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Expand Up@@ -104,9 +104,7 @@ The repo also ships “middleware” packages under `packages/middleware/` (e.g.

### Experimental Features

Located in `packages/*/src/experimental/`:

- **Tasks**: Long-running task support with polling/resumption (`packages/core/src/experimental/tasks/`)
Located in `packages/*/src/experimental/`. Currently empty.

### Zod Schemas

Expand DownExpand Up@@ -201,7 +199,6 @@ The `ctx` parameter in handlers provides a structured context:
 - `notify(notification)`: Send related notification back
- `http?`: HTTP transport info (undefined for stdio)
 - `authInfo?`: Validated auth token info
- `task?`: Task context (`{ id?, store, requestedTtl? }`) when task storage is configured

**`ServerContext`** extends `BaseContext.mcpReq` and `BaseContext.http?` via type intersection:

Expand Down

16 changes: 2 additions & 14 deletions
docs/client.md

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Expand Up@@ -544,7 +544,7 @@ All requests have a 60-second default timeout. Pass a custom `timeout` in the op
```ts source="../examples/client/src/clientGuide.examples.ts#errorHandling_timeout"
try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
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Expand DownExpand Up@@ -581,7 +581,7 @@ let lastToken: string | undefined;
const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand All@@ -596,18 +596,6 @@ console.log(result);

For an end-to-end example of server-initiated SSE disconnection and automatic client reconnection with event replay, see [`ssePollingClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/ssePollingClient.ts).

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#callToolStream | client.experimental.tasks.callToolStream(...)} to start a tool call that may create a task and emit status updates over time.
- Call {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTask | client.experimental.tasks.getTask(...)} and {@linkcode @modelcontextprotocol/client!experimental/tasks/client.ExperimentalClientTasks#getTaskResult | getTaskResult(...)} to check status and fetch results after reconnecting.

For a full runnable example, see [`simpleTaskInteractiveClient.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/client/src/simpleTaskInteractiveClient.ts).

## See also

- [`examples/client/`](https://github.com/modelcontextprotocol/typescript-sdk/tree/main/examples/client) — Full runnable client examples
Expand Down

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docs/migration-SKILL.md

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docs/server.md

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Expand Up@@ -495,19 +495,6 @@ server.registerTool(
);
```

## Tasks (experimental)

> [!WARNING]
> The tasks API is experimental and may change without notice.

Task-based execution enables "call-now, fetch-later" patterns for long-running operations (see [Tasks](https://modelcontextprotocol.io/specification/latest/basic/utilities/tasks) in the MCP specification). Instead of returning a result immediately, a tool creates a task that can be polled or resumed later. To use tasks:

- Provide a {@linkcode @modelcontextprotocol/server!index.TaskStore | TaskStore} implementation that persists task metadata and results (see {@linkcode @modelcontextprotocol/server!index.InMemoryTaskStore | InMemoryTaskStore} for reference).
- Enable the `tasks` capability when constructing the server.
- Register tools with {@linkcode @modelcontextprotocol/server!experimental/tasks/mcpServer.ExperimentalMcpServerTasks#registerToolTask | server.experimental.tasks.registerToolTask(...)}.

For a full runnable example, see [`simpleTaskInteractive.ts`](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/examples/server/src/simpleTaskInteractive.ts).

## Shutdown

For stateful multi-session HTTP servers, capture the `http.Server` from `app.listen()` so you can stop accepting connections, then close each session transport:
Expand Down

23 changes: 11 additions & 12 deletions
examples/client/README.md

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Expand Up@@ -24,18 +24,17 @@ Most clients expect a server to be running. Start one from [`../server/README.md

## Example index

| Scenario | Description | File |
| --------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, elicitation, and tasks. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |
| Task interactive client | Demonstrates task-based execution + interactive server→client requests. | [`src/simpleTaskInteractiveClient.ts`](src/simpleTaskInteractiveClient.ts) |
| Scenario | Description | File |
| --------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| Interactive Streamable HTTP client | CLI client that exercises tools/resources/prompts, notifications, and elicitation. | [`src/simpleStreamableHttp.ts`](src/simpleStreamableHttp.ts) |
| Backwards-compatible client (Streamable HTTP → SSE) | Tries Streamable HTTP first, falls back to legacy SSE on 4xx responses. | [`src/streamableHttpWithSseFallbackClient.ts`](src/streamableHttpWithSseFallbackClient.ts) |
| SSE polling client (legacy) | Polls a legacy HTTP+SSE server and demonstrates notification handling. | [`src/ssePollingClient.ts`](src/ssePollingClient.ts) |
| Parallel tool calls | Runs multiple tool calls in parallel. | [`src/parallelToolCallsClient.ts`](src/parallelToolCallsClient.ts) |
| Multiple clients in parallel | Connects multiple clients concurrently to the same server. | [`src/multipleClientsParallel.ts`](src/multipleClientsParallel.ts) |
| OAuth client (interactive) | OAuth-enabled client (dynamic registration, auth flow). | [`src/simpleOAuthClient.ts`](src/simpleOAuthClient.ts) |
| OAuth provider helper | Demonstrates reusable OAuth providers. | [`src/simpleOAuthClientProvider.ts`](src/simpleOAuthClientProvider.ts) |
| Client credentials (M2M) | Machine-to-machine OAuth client credentials example. | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts) |
| URL elicitation client | Drives URL-mode elicitation flows (sensitive input in a browser). | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts) |

## URL elicitation example (server + client)

Expand Down

4 changes: 2 additions & 2 deletions
examples/client/src/clientGuide.examples.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -490,7 +490,7 @@ async function errorHandling_timeout(client: Client) {
 //#region errorHandling_timeout
 try {
 const result = await client.callTool(
 { name: 'slow-task', arguments: {} },
 { name: 'slow-operation', arguments: {} },
 { timeout: 120_000 } // 2 minutes instead of the default 60 seconds
 );
 console.log(result.content);
Expand DownExpand Up@@ -530,7 +530,7 @@ async function resumptionToken_basic(client: Client) {
 const result = await client.request(
 {
 method: 'tools/call',
 params: { name: 'long-running-task', arguments: {} }
 params: { name: 'long-running-operation', arguments: {} }
 },
 {
 resumptionToken: lastToken,
Expand Down

67 changes: 8 additions & 59 deletions
examples/client/src/simpleOAuthClient.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,7 +4,7 @@ import { createServer } from 'node:http';
import { createInterface } from 'node:readline';
import { URL } from 'node:url';

import type { CallToolResult, ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import type { ListToolsRequest, OAuthClientMetadata } from '@modelcontextprotocol/client';
import { Client, StreamableHTTPClientTransport, UnauthorizedError } from '@modelcontextprotocol/client';
import open from 'open';

Expand DownExpand Up@@ -209,7 +209,7 @@ class InteractiveOAuthClient {
 console.log('Commands:');
 console.log(' list - List available tools');
 console.log(' call <tool_name> [args] - Call a tool');
 console.log(' stream <tool_name> [args] - Call a tool with streaming (shows task status)');
 console.log(' stream <tool_name> [args] - (disabled; returns when the SEP-2663 tasks extension lands)');
 console.log(' quit - Exit the client');
 console.log();

Expand All@@ -232,7 +232,7 @@ class InteractiveOAuthClient {
 } else if (command.startsWith('stream ')) {
 await this.handleStreamTool(command);
 } else {
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', 'stream <tool_name>', or 'quit'");
 console.log("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'");
 }
 } catch (error) {
 if (error instanceof Error && error.message === 'SIGINT') {
Expand DownExpand Up@@ -358,62 +358,11 @@ class InteractiveOAuthClient {
 return;
 }

 try {
 // Using the experimental tasks API - WARNING: may change without notice
 console.log(`\n🔧 Streaming tool '${toolName}'...`);

 const stream = this.client.experimental.tasks.callToolStream(
 {
 name: toolName,
 arguments: toolArgs
 },
 {
 task: {
 taskId: `task-${Date.now()}`,
 ttl: 60_000
 }
 }
 );

 // Iterate through all messages yielded by the generator
 for await (const message of stream) {
 switch (message.type) {
 case 'taskCreated': {
 console.log(`✓ Task created: ${message.task.taskId}`);
 break;
 }

 case 'taskStatus': {
 console.log(`⟳ Status: ${message.task.status}`);
 if (message.task.statusMessage) {
 console.log(` ${message.task.statusMessage}`);
 }
 break;
 }

 case 'result': {
 console.log('✓ Completed!');
 const toolResult = message.result as CallToolResult;
 for (const content of toolResult.content) {
 if (content.type === 'text') {
 console.log(content.text);
 } else {
 console.log(content);
 }
 }
 break;
 }

 case 'error': {
 console.log('✗ Error:');
 console.log(` ${message.error.message}`);
 break;
 }
 }
 }
 } catch (error) {
 console.error(`❌ Failed to stream tool '${toolName}':`, error);
 }
 // The streaming-tool demo (callToolStream) was removed with the 2025-11
 // experimental tasks (SEP-2663); it returns when the tasks extension lands.
 void toolName;
 void toolArgs;
 console.log('Streaming tool demo removed with the 2025-11 experimental tasks (SEP-2663); returns when the tasks extension lands.');
 }

 close(): void {
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