eventName
PreCompact (canonical)
displayName
PreCompact (canonical)
kind
canonical
direction
pre
blocking
true
family
in-process
payloadSchema
type
object
required
- session_id
- transcript_path
- trigger
properties
session_id
transcript_path
trigger
type
string
enum
description
manual = /compact slash command; auto = context-window pressure.
custom_instructions
type
string
description
Free-form user instructions accompanying a manual compaction.
description
Fires before a context-compaction step; can block or alter the compaction. Claude Code 1.0+.