eventName
SubagentStart (Claude Code)
displayName
SubagentStart (Claude Code)
kind
native
originVendor
Anthropic
direction
pre
blocking
false
family
observer
payloadSchema
type
object
required
- hook_event_name
- agent_type
- agent_id
- prompt
properties
hook_event_name
type
string
const
SubagentStart
agent_type
agent_id
prompt
description
Fires when a subagent is spawned. Output limited to additionalContext
visible only to the user (not the subagent or parent). Used for UI
indicators / telemetry. Matchable by agent_type.