sessionStartHooks
A Claude Code settings key, read out of the shipped bundle. It was in the build from v2.1.315 and was gone by v2.1.317.
Resuming a session now also restores its session-start hooks, not just its regular hooks
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.268.
In the changelogs
2Releases whose published page names sessionStartHooks.
-
v2.1.268
Session resume now carries session-start hooks across resume
Resuming a session now also restores its session-start hooks, not just its regular hooks
found in this entry's text, named in this entry
-
v2.1.268
Session resume reworked to compute session-start hooks asynchronously, plus partial-history resume support
Session resume now computes startup hooks asynchronously and can resume from just part of a session's history
found in this entry's text
First cited
3The earliest release whose published evidence quoted sessionStartHooks was v2.1.268, 10 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
2Build by build
7One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.