on
Lifecycle hook — fired as the model streams the tool's input JSON token-by-token (StreamEvent.ToolInputDelta). The accumulated input isn't yet valid JSON; this is for raw-character pre-warm.
Lifecycle hook — fired as the model streams the tool's input JSON token-by-token (StreamEvent.ToolInputDelta). The accumulated input isn't yet valid JSON; this is for raw-character pre-warm.