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Stable handle for one tool call: name, arguments, and async results.
Emitted when content-block-finish delivers a finalized tool_call block.
Correlates with protocol toolCallId when the runtime provides one.
Resolves to an error message string if ToolCallStream.status is
"error", otherwise undefined.
Arguments passed to the tool (finalized when the call is observable).
The node name extracted from the last segment of the namespace path (everything before the final colon, or the full segment if no colon).
Resolves to ToolCallStatus when the call leaves the running state.