What probably matters to youSection of the release
What
The snapshot files written when forking a conversation (see the new fork_conversation tool) now have a fixed maximum size, and writing one that exceeds it now fails with a dedicated error instead of succeeding silently. A separate internal helper keeps a snapshot file's modification time fresh, and a new environment variable, CLAUDE_CODE_PRINT_BG_WAIT_CEILING_MS, controls a related ceiling on how long a background wait can run.
Why
The size cap prevents oversized conversation forks from being written unbounded, and the new environment variable gives more control over background-wait timing in headless or scripted use.
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.
Confirmed sinceAnthropic's documentation has since written up CLAUDE_CODE_PRINT_BG_WAIT_CEILING_MS, on Run Claude Code programmatically.Unless a background command that the main conversation started is still running, Claude Code stops whatever is still running after 10 minutes of continuous idle waiting by default and drops its partial result. To change the 10-minute cap, …headlesssee 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 CLAUDE_CODE_PRINT_BG_WAIT_CEILING_MS, on Run Claude Code programmatically.
