Tool Call Event
State of one streaming tool call, assembled from TOOL_CALL_START / TOOL_CALL_ARGS / TOOL_CALL_END / TOOL_CALL_RESULT events.
The args string is the concatenation of every delta received so far — it may be mid-JSON and not parse cleanly. Consumers that render generative UI from partial args should use a lenient JSON merger (see :a2cui-actions layer).
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data class ArgsComplete(val toolCallId: String, val toolCallName: String, val args: String) : ToolCallEvent
Tool call args are complete; no further deltas will arrive.