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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.268 ·

Session resume now carries SessionStart hooks through, including partial-history resume

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Resuming a session now properly forwards its SessionStart hooks, and can resume from just part of the transcript

TierYou'll noticehow much it should matter to you
Useful2my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaHookswhat it touches
KindImprovementsin v2.1.268,
Group of 3 You'll notice

Resuming a session now properly forwards its SessionStart hooks, and can resume from just part of the transcript

What

  • Session resume/fork no longer passes hookMessages/hooksPromise directly to the startup path; instead it returns a sessionStartHooks promise wired through a new abortable "tail" queue. Resume also gained a precedingRows option, letting a caller resume from a subset of prior transcript rows instead of the full session.
  • When resuming a session from the picker, the session's recorded sessionStartHooks are captured and threaded through as pendingHookMessages into the resumed UI state.
  • Resumed sessions now propagate this sessionStartHooks field into pendingHookMessages when reconstructing state, alongside the existing sessionHooks field, which was previously missing from the restored-session object.

Why This ensures SessionStart hooks that fired for a session are correctly carried over when that session is resumed, so hook-driven setup isn't silently lost, and it also enables resuming from a partial transcript.

Read from
Names in the bundleSessionStart
Since it was published

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.

Added since A small documentation edit on Hooks reference touched a line naming SessionStart after this was published. The same wait applies at launch, including a resumed session: a prompt you send while SessionStart hooks are still running doesn't reach Claude until they finish. hooks see the edit
Confirmed since Anthropic's documentation has since written up SessionStart, on Claude Code changelog. * Improved hook feedback: while a SessionStart, UserPromptSubmit, PreToolUse or SessionEnd hook runs, the spinner says so with elapsed time, and Esc cancels a prompt waiting on a SessionStart hook changelog see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up SessionStart, on Claude Code changelog.

See this entry in the whole of v2.1.268 →

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