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HomeDocsClaude Code CLI 7 Nov 2026
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Connect Claude Code to tools via MCP changedmcp

Upstream edited this page at 7 Nov 2026 19:18 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 7 Nov 2026 19:37 UTC.

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593593#### Answer the call with a task
594594 
595Answer with a task only when the request carries the extension, or Claude gets the tool error `Unsupported result type 'task' for tools/call`. Claude gets the same error when `taskId`, `status`, `createdAt`, `lastUpdatedAt`, or `ttlMs` is missing. The task object is the JSON-RPC `result` of your `tools/call` response, needs no `content` array, and here includes the optional `statusMessage` and `pollIntervalMs`:
595Answer with a task only when the request carries the extension, or the call fails with the tool error `Unsupported result type 'task' for tools/call`. The call fails the same way if your answer has no `taskId` or no valid `status`. The task object is the JSON-RPC `result` of your `tools/call` response, needs no `content` array, and here includes the optional `statusMessage` and `pollIntervalMs`:
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597597```json theme={null}
598598{
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612612| `resultType` | Set it to `"task"` to mark the reply as a task. Without it, Claude Code reads the reply as a plain result |
613613| `taskId` | Required. At most 128 printable ASCII characters with no spaces, or Claude gets a tool error beginning `MCP server "<name>" returned a malformed task handle for tool "<tool>"`. Keep the ID answerable across connections, because after a resume Claude Code asks about it on a new connection |
614614| `status` | Required. One of `working`, `input_required`, `completed`, `failed`, or `cancelled`. Another value gives the `Unsupported result type` error |
615| `createdAt`, `lastUpdatedAt`, `ttlMs` | Required, and `ttlMs` may be `null`. Claude Code doesn't drop a task because its `ttlMs` has passed |
616| `pollIntervalMs` | Optional, but not `null`. Milliseconds between `tasks/get` requests, clamped to between 250 and 30000. Claude Code uses 2000 when the field is absent, and reads the value again from each `tasks/get` response |
615| `createdAt`, `lastUpdatedAt`, `ttlMs` | Required by the tasks extension, and `ttlMs` may be `null`. Claude Code doesn't drop a task because its `ttlMs` has passed |
616| `pollIntervalMs` | Optional. Milliseconds between `tasks/get` requests, clamped to between 250 and 30000. Claude Code uses 2000 when the field is absent or `null`, and reads the value again from each `tasks/get` response |
617617| `statusMessage` | Optional. `/tasks` shows the value from your latest `tasks/get` response, not this first one, and a response that omits the field clears it. A [status message from Claude Code](#status-messages-on-an-mcp-task) can take its place |
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619Claude Code accepts a task answer that omits `createdAt`, `lastUpdatedAt`, or `ttlMs`, or that sets `pollIntervalMs` to `null`. Before v2.1.317, the call failed with the `Unsupported result type` error instead. To work with those versions too, send the three fields that the tasks extension requires, and send `pollIntervalMs` as a number or not at all.
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619621On an HTTP or claude.ai connector server, the task answer has to start within the [per-request timer](#time-limits-on-mcp-tool-calls), so accept the job and answer first, then do the work.
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