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DottaandClaude Opus 5.5
aca908a165
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - The restart chaos harness (`tests/restart-chaos/`) runs waves of
real agent tasks while it restarts the control plane on purpose
> - A wave writes a timeline file and also echoes every timeline entry
to stdout
> - When the process that reads that stdout exits, every echo fails with
EPIPE. The uncaught-exception handler then records the error with
another echo, so the loop never ends
> - In one Daytona wave this wrote 3.2 million entries (2.5 GB) in 30
minutes. It also stopped the wave from grading its tasks
> - This pull request stops the echo after the first stdout error, and
records the stdout loss once
> - The benefit is that a wave keeps running and grading when its log
reader goes away
## Linked Issues or Issue Description
**Bug description**
`Timeline.add` echoes with `console.info`. After stdout breaks, each
echo raises EPIPE as an uncaught exception. The handler in `main.ts`
calls `timeline.add("harness_uncaught_exception")`, and that call echoes
again.
**Steps to reproduce**
Run a wave as a child process that reads its stdout, for example from a
wave-loop script. Kill the parent while the wave runs. `timeline.jsonl`
then grows without bound with `harness_uncaught_exception` / `write
EPIPE` entries.
**Expected behavior**
The wave goes on writing its files (timeline, grades, ledger) and stops
writing to the broken stdout.
Refs #19544
## What Changed
- `tests/restart-chaos/timeline.ts`: a `process.stdout` error listener
and a guard around `console.info` turn off the echo for good after a
broken-pipe error. The timeline file is still written. On the first
entry after the echo stops, the timeline writes one
`harness_stdout_lost` entry (file only) with the error. The file adds
`isBrokenStdoutError` and `markTimelineEchoBroken`.
- `tests/restart-chaos/main.ts`: the uncaught-exception handler passes
broken-stdout errors to `markTimelineEchoBroken`. It does not mark the
wave as interrupted and does not set a harness error.
- `tests/restart-chaos/timeline.test.ts` (new): the error
classification, and the file-but-no-echo behaviour with exactly one
`harness_stdout_lost` entry.
## Verification
- `pnpm exec vitest run --config tests/restart-chaos/vitest.config.ts`:
102/102 pass.
- `node scripts/typecheck-test-projects.mjs tests/restart-chaos`: clean.
- Incident: wave `w-20261107T001552-s13`. Its timeline had 76 real
entries, then 3,242,762 `harness_uncaught_exception` entries. Those 3.2
million entries came from the loop this pull request removes.
## Risks
- This change touches the test harness only.
- After stdout breaks, the console shows no wave progress, but every
result is still in the wave's files. A different uncaught exception
still stops the wave as before.
> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.
## Model Used
- Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, in Claude Code with
tool use (shell, file edits, GitHub CLI). Default context window,
extended thinking.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>