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cause: LifecycleCause | None
Causation edge — the tool call that triggered this subagent.
Returns the LifecycleCause recovered by the base transformer (a {"type": "toolCall", "tool_call_id": ...} dict) when the originating tool call could be joined, else None.
LifecycleCause
{"type": "toolCall", "tool_call_id": ...}
None
