displayName
Cohere chat-stream / tool-call-start
messageType
StreamEvent
subtype
none
direction
core-to-user
terminal
false
errorCategory
none
payloadSchema
type
StreamEvent
fields
- type=tool-call-start
- index
- delta(message(tool_calls(id, type, function(name))))
description
Begins a tool-call content block — emits id, function name, and an
empty arguments string ready to receive deltas.