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storkit: create 452_bug_claude_code_pty_crashes_with_fatal_runtime_error_on_agent_restart

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dave
2026-03-31 11:13:05 +00:00
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---
name: "Claude Code PTY crashes with fatal runtime error on agent restart"
---
# Bug 452: Claude Code PTY crashes with fatal runtime error on agent restart
## Description
When an agent is restarted on a worktree where coding is already complete (clean worktree, all changes committed), the Claude Code PTY process crashes immediately on startup with `fatal runtime error: assertion failed: output.write(&bytes).is_ok(), aborting`. The process exits in the same second it spawns, with `Session: None`. This burns through retries and blocks the story. The crash comes from inside the Claude Code binary itself, not storkit code. Observed on both story 449 and 450 worktrees.
## How to Reproduce
Have a story in current stage with a worktree that has all coding done and committed (clean `git status`). Let the gates fail for an unrelated reason (e.g. a test failure). The pipeline restarts the agent on the same worktree. The Claude Code process crashes immediately with the fatal runtime error.
## Actual Result
`fatal runtime error: assertion failed: output.write(&bytes).is_ok(), aborting` — process exits instantly, session is None, burns retries.
## Expected Result
Claude Code should start successfully on the worktree and the agent should be able to fix any gate failures.
## Acceptance Criteria
- [ ] Agent restart on a worktree with committed work does not crash the PTY
- [ ] If Claude Code fails to start, the error is handled gracefully without burning retries