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15921592* `api_error_status`: the HTTP status code of the terminating API error. `None` when the turn ended without one. Populated only on `subtype="success"`.
15931593* `result`: text of the final assistant message on `subtype="success"`, or `None` on the `error_*` subtypes. When `subtype="success"` and `is_error=True`, this holds the API error string if one is available but can be empty, so check `api_error_status` and the preceding `AssistantMessage` content for detail.
15941594* `errors`: loop-level error strings such as the max-turns message. Populated only on the `error_*` subtypes.
1595* `terminal_reason`: why the query loop ended, such as `"completed"`, `"max_turns"`, `"api_error"`, `"aborted_streaming"`, or `"aborted_tools"`. A value of `"aborted_streaming"` or `"aborted_tools"` means the turn was aborted before completing. Common causes are [`interrupt()`](#claudesdkclient) and a permission callback returning [`PermissionResultDeny`](#permissionresultdeny) with `interrupt=True`. `None` on CLI versions that predate the field, on results that bypassed the query loop such as local slash commands, or on synthesized error results emitted when the session fails fatally. Mirrors the TypeScript SDK's [`SDKResultMessage.terminal_reason`](/docs/en/agent-sdk/typescript#sdkresultmessage), which lists the full set of values.
1595* `terminal_reason`: why the query loop ended, such as `"completed"`, `"max_turns"`, `"api_error"`, `"aborted_streaming"`, or `"aborted_tools"`. A value of `"aborted_streaming"` or `"aborted_tools"` means the turn was aborted before completing. Common causes are [`interrupt()`](#claudesdkclient) and a permission callback returning [`PermissionResultDeny`](#permissionresultdeny) with `interrupt=True`. `None` on CLI versions that predate the field, on results from local commands such as `/voice` or `/usage`, which bypass the query loop, or on synthesized error results emitted when the session fails fatally. Mirrors the TypeScript SDK's [`SDKResultMessage.terminal_reason`](/docs/en/agent-sdk/typescript#sdkresultmessage), which lists the full set of values.
15961596* `origin`: origin of the user message that triggered this turn. In [streaming input mode](/docs/en/agent-sdk/streaming-vs-single-mode), check this to tell the result of your own prompt, where `origin` is `None` or `{"kind": "human"}`, from the result of an injected turn such as a background-task notification. Requires Python Agent SDK 0.2.137 or later.
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15981598The `usage` dict covers the main agent loop only and excludes subagent and other nested or auxiliary model calls. In [streaming input mode](/docs/en/agent-sdk/streaming-vs-single-mode), the values are per-turn. Prefer `model_usage` for token and cost accounting. The `usage` dict contains the following keys when present: