> - Paperclip is the open source app people use to manage AI agents for
work
> - Paperclip uses local adapters to connect agent sessions to the
control plane
> - The Codex adapter emits turn events from response and notification
channels
> - A terminal notification can arrive before the turn/start response
> - This pull request gates the terminal event on turn.accepted
> - The result keeps the event order stable for consumers and tests
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - Paperclip uses local adapters to connect agent sessions to the
control plane
> - The Codex adapter emits turn events from response and notification
channels
> - A terminal notification can arrive before the turn/start response
> - This pull request gates the terminal event on turn.accepted
> - The result keeps the event order stable for consumers and tests
## Linked Issues or Issue Description
**What happened?**
The Codex harness session emitted `turn.accepted` only after the
`turn/start` response resolved. A terminal notification could arrive
before that response and reach consumers first.
**Expected behavior**
The Codex driver must emit `turn.accepted` before any terminal event for
the same turn.
**Steps to reproduce**
1. Start a Codex harness session.
2. Keep the `turn/start` response pending.
3. Send `turn/started` and `turn/completed` notifications.
4. Observe the event order.
**Paperclip version or commit**
`afbcd28dae9e51108738c4258929b95ca359186c`
**Deployment mode**
Built from source with the Codex driver test harness.
**Agent adapter(s) involved**
Codex.
## What Changed
- Add session state that tracks a pending `turn/start` operation.
- Resolve the state when `turn/start` succeeds or fails.
- Wait for that state before the terminal notification handler emits its
event.
- Add a regression test that delivers a terminal notification while
`turn/start` remains pending.
## Verification
- The regression test failed 5 of 5 times before this change and passed
5 of 5 times after it.
- The Codex driver suite passed 189 of 189 tests.
- The affected live transport test file passed 46 of 46 tests on 10
consecutive runs.
- The TypeScript check exited with status 0.
- Continuous integration must pass before merge.
## Risks
The change affects only Codex turn event ordering. It adds no sleep,
retry, or timeout. The main risk is a provider path that does not settle
`turn/start`; existing provider response handling still controls
completion.
## Model Used
OpenAI GPT-5. The exact deployment identifier is not exposed in this
environment. Tool use and code execution assisted this change.
## 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
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
---------
Co-authored-by: Paperclip <noreply@paperclip.ing>
## Thinking Path
> - Paperclip manages AI agents and their work.
> - The runner starts ACPX sessions and controls their resources.
> - An aborted admission can leave sandbox preparation active after the
opening promise rejects.
> - Test teardown can then remove the sandbox directory before that work
ends.
> - This pull request retains and observes each unfinished admission
stage.
> - The change gives runtime resources and temporary directories one
deterministic cleanup owner.
## Linked Issues or Issue Description
**What happened?**
Under full test load, an aborted admission test can end before sandbox
preparation settles. Test teardown then removes the temporary session
directory. The active preparation can report an unhandled `ENOENT`
error.
**Expected behavior**
An aborted admission must observe and retain all active preparation
work. Test teardown must wait until that work settles.
**Steps to reproduce**
1. Run the complete `@paperclipai/paperclip-runner` test suite under CI
load.
2. Abort runtime admission during credential or sandbox preparation.
3. Observe an intermittent test timeout or an unhandled
missing-directory error.
**Paperclip version or commit**
The failure occurred on a branch based on commit `b1f4910ee`. This fix
is based on current `master` commit `4d30efa8e`.
**Deployment mode**
The failure occurred in GitHub Actions on a source build.
## What Changed
- Retain each unfinished abortable admission stage in the global
runtime-host cleanup set.
- Notify the embedding lifecycle when an aborted stage needs deferred
cleanup.
- Make test teardown abort and await all active opening and cleanup
promises before directory removal.
- Replace time-based stage detection with exact deferred stage signals.
- Add a deterministic regression test for an abort during sandbox
preparation.
## Verification
- Ran the focused runtime-host file in 20 separate processes. All 20
runs passed without an unhandled error.
- Ran `pnpm --filter @paperclipai/paperclip-runner exec vitest run
src/drivers/acpx/runtime-host.test.ts` after the rebase. All 27 tests
passed.
- Ran `pnpm --filter @paperclipai/paperclip-runner check:all` after the
rebase. The full command passed.
- The final TypeScript test stage passed 127 files and 1,490 tests. All
Rust checks, tests, and parity checks passed.
- Greptile reviewed two heads. The final review is 5/5 with no open
comments.
- All latest-head CI and security checks passed. One unrelated workspace
test passed on its permitted rerun.
## Risks
- Risk is low. An aborted stage now delays final runtime-host cleanup
until its active operation settles.
- A stage that never settles can delay embedding shutdown. The existing
stage operations have bounded or controlled owners.
- The regression test holds sandbox preparation and confirms the new
cleanup order.
> 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
OpenAI Codex with GPT-5 assisted this change. The environment did not
provide the exact deployment ID or context size. The model used
reasoning, shell tools, code editing, and test execution.
## 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
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
---------
Co-authored-by: Paperclip <noreply@paperclip.ing>
Dotta