Unclear Another condition also decides whether the read-ahead runs, and what it checks is not stated.
What
A transcript is the saved record of a conversation, used to pick a session back up. For sessions connected through an SDK address that do not use storage version 5, Claude Code now reads the transcript ahead of time when resuming. A large transcript is read in several pieces at once. If that read is cancelled, the resume is stopped.
Set the environment variable CLAUDE_CODE_DISABLE_TRANSCRIPT_READ_AHEAD to skip the read-ahead.
Why
This changes how those sessions are resumed, and the variable gives you a way back if the read-ahead causes trouble.
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Another condition also decides whether the read-ahead runs, and what it checks is not stated.