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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.
interface ToolCallStreamCorrelates 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).
Tool identifier as registered on the graph or model schema.
Resolves to the tool return value on success.
Rejection or hang semantics depend on the runner; pairing with ToolCallStream.status and ToolCallStream.error is recommended.
Resolves to ToolCallStatus when the call leaves the running state.