Unique ID of this call; matches the finished event
Localized display name of the tool
Locale-stable tool identifier; use this for logic keyed on the tool kind
Call arguments as a JSON string
Progress text suitable for direct display, e.g. "Searching the web…"
Short tags accompanying tips; may be omitted
Round number. Calls in the same round (same iteration) run in
parallel
Start time, Unix timestamp in seconds
Payload of a
node_tool_use_startedstream event — an ordinary tool call has started. Match it to itsNodeToolUseFinishedcounterpart bytoolUseId.