Unclear When and where this crash report is produced is not known.
What
A headless session is one that runs without the interactive screen. When the loop that handles each turn in such a session crashes, Claude Code now reports the kind of error or its code, but leaves out the error message because it may hold private data. For a local session, the full message is still in the session's result.
Why
This changes what logs and usage reports contain after a crash, keeping possibly private details out of them.
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When and where this crash report is produced is not known.