Unclear The finding does not say what session.measure actually measures or when it fires.
Claude Code added two new lifecycle events, session.end and session.measure, to the set of events that plugins and hooks (scripts that run automatically at specific points) can respond to. These join existing session-related events like session.compact and session.attach. The new events are wired through the schema, an internal raiser mechanism, and real call sites that emit them during a session.
This gives plugins and hooks more points in a session's lifecycle to hook into, specifically when a session ends and when some kind of measurement occurs.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
| All `session.end` hooks together | As long as the [SessionEnd hook budget](/docs/en/hooks#sessionend-input), 1.5 seconds unless you change it, counted from when your settings `SessionEnd` hooks finish |plugins/mods/reference see the edit
The finding does not say what `session.measure` actually measures or when it fires.
Anthropic's documentation has since written up session.end, on Mods reference.