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Agent SDK reference - Python changedagent-sdk/python

Nearest release: v2.1.322, published 15 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 10 Nov 2026 17:24 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 10 Nov 2026 17:37 UTC.

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18551855### `TaskStartedMessage`
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1857Emitted when a background task starts. A background task is anything tracked outside the main turn: a backgrounded Bash command, a [Monitor](#monitor) watch, a subagent spawned via the Agent tool, or a remote agent. The `task_type` field tells you which. This naming is unrelated to the `Task`-to-`Agent` tool rename.
1857Emitted when a background task starts. A background task is anything tracked outside the main turn, such as a backgrounded Bash command, a [Monitor](#monitor) watch, a subagent spawned via the Agent tool, or a remote agent. This naming is unrelated to the `Task`-to-`Agent` tool rename.
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18591859```python theme={null}
18601860@dataclass
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18741874| `uuid` | `str` | Unique message identifier |
18751875| `session_id` | `str` | Session identifier |
18761876| `tool_use_id` | `str \| None` | Associated tool use ID |
1877| `task_type` | `str \| None` | Which kind of background task: `"local_bash"` for background Bash and Monitor watches, `"local_agent"`, or `"remote_agent"` |
1877| `task_type` | `str \| None` | Which kind of background task, such as `"local_bash"` for background Bash and Monitor watches, `"local_agent"` for subagents, `"mcp_task"` for [background MCP tool calls](https://code.claude.com/docs/en/mcp.md#automatic-backgrounding-of-long-tool-calls), or `"remote_agent"` |
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18791879### `TaskUsage`
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