The session observed its child only via stdout. Two failure modes:
with --verbose the CLI chats on stderr, and an undrained 64KB pipe
blocks the child mid-turn with zero diagnostics; and nothing watched
the exit code, so a crashed process just looked thoughtful forever.
ClaudeStreamJsonProcess now drains stderr from construction into a
bounded tail buffer, and StreamJsonSession watches exitCode: on death
it flips busy off, clears any unanswerable pending prompt, and emits
a SessionEnd (exit code + stderr tail) — replayed via session.end for
late binders. The pane reports the exit in its status line and logs
the stderr tail; a deliberate dispose suppresses the watch so /clear
and teardown don't read as crashes. Test fakes extend the process
base instead of implementing it, so its defaults carry.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
a919d79ce1