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Bohan Jiang aca74293dd fix(agent/claude): surface stderr tail on writeClaudeInput failure + lock with e2e test (#1698)
#1674 wired claude's post-handshake error path through withAgentStderr but
left the writeClaudeInput failure branch returning a bare "broken pipe"
error. That branch fires precisely when claude crashes during startup —
exactly when the stderr tail is most useful for root-causing V8 aborts,
Bun panics, or missing native modules. cmd.Wait() before sampling Tail()
flushes os/exec's internal stderr copy goroutine, matching the
Wait→Tail synchronization contract spelled out in stderr_tail.go.

Adds TestClaudeExecuteSurfacesStderrWhenChildExitsEarly mirroring the
codex test: a fake claude binary drains stdin, writes a V8-abort line to
stderr, and exits 3. Locks in the contract that Result.Error carries the
stderr tail in the post-handshake failure path on the claude backend too.
2026-04-26 11:09:38 +08:00
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