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New CLI flag --resume-session-at=<message-uuid> for resuming a session starting at a specific point in the transcript.
Details
- Must be combined with
--resume; without it Claude Code exits immediately withError: --resume-session-at requires --resume. - The value is the
uuidfield of a specific message in the saved transcript — not a timestamp, ordinal index, or boundary marker. - When the UUID is found, the loaded transcript is sliced to include only messages up to and including that message (
messages.slice(0, index + 1)), so the resumed session behaves as if the conversation ended exactly at that point. - When the UUID is not found in the transcript, Claude Code exits with
No message found with message.uuid of: <value>and a non-zero exit code. - Available in the TypeScript SDK as the
resumeSessionAtoption on the session options object; the SDK translates it to--resume-session-at=<value>in the subprocess argument list. - The flag is hidden from
--helpoutput (.hideHelp()); the internal help string reads: "When resuming, only messages up to and including the assistant message with <message.id>".
Evidence
--resume-session-at <message id> CLI option definition and the c.messages.findIndex((d) => d.uuid === t.resumeSessionAt) slicing inside loadInitialMessages / dqf (search for "resume-session-at")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.