Files
PaperClipAI/server
DottaandClaude 94c7c83ce8 fix(runner): refuse a moved-root same-session checkpoint by name (#20723)
## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - Native runs on a remote sandbox resume a task's provider session
from a saved checkpoint
> - #20712 made a checkpoint that names an abandoned remote workspace
root decline recovery, so a replacement session opens in the new root
> - A checkpoint that requires the same session (an unfinished goal,
`same_session_only`) cannot be replaced. It then failed with the generic
`native_session_recovery_failed`, which recovery treats as a retryable
interruption
> - A retry cannot move a saved session to another root, so the failure
repeats. The upgrade-safe rule requires a permanent, named code for this
case
> - Also, the working-directory errors said "Codex" on Claude and other
ACPX runs, because one app-server driver serves all of them
> - This pull request reports the moved root as provider state that is
incompatible, and makes the errors name the agent generically
> - The benefit is a named, permanent refusal with a working board
Retry, and error text that is correct for every agent

## Linked Issues or Issue Description

Refs #20712

**What happened?**
After #20712, a `same_session_only` checkpoint with a moved remote root
ended with `native_session_recovery_failed: persisted session working
directory is not the assigned remote workspace`. That is not a named
permanent code, so recovery could retry a run that cannot succeed. On
ACPX Claude runs, path errors read "Remote Codex working directory ...".

**Expected behavior**
The run ends with the permanent code
`native_provider_state_incompatible`. Automatic retries stop. A board
Retry continues the task in a fresh provider session in the same
workspace. Errors do not name Codex on other agents.

**Steps to reproduce**
1. Save a native checkpoint with `providerRecoveryPolicy:
same_session_only` under one remote workspace root.
2. Assign the run a different sibling root (the epoch was abandoned).
3. Resume the run.

## What Changed

- `codex-app-server-driver-impl.ts`: the moved-root decline from #20712
now carries `failureClass: provider_state_incompatible`. The runtime
already maps that class:
- checkpoint allows replacement
(`allow_replacement_after_resume_failure`): a replacement session opens
in the assigned root, as before;
- checkpoint requires the same session:
`NativeProviderStateIncompatibleError`, code
`native_provider_state_incompatible`.
- The server already treats `native_provider_state_incompatible` as a
permanent failure (no automatic retry, board action text "Retry the task
to continue in a fresh provider session with the same workspace").
`rebindNativeSessionCheckpoint` returns no checkpoint after that code,
so a board Retry starts a fresh session in the same workspace. No server
change is needed.
- A moved-root checkpoint with an active turn or a pending runtime
request now reports `provider_side_effect_pending`. The runtime never
replaces it under any policy, and the run ends with the permanent code
`native_provider_side_effect_pending` for an operator to reconcile.
Before, it threw the working-directory refusal, which recovery recorded
as the retryable `native_session_interrupted`.
- `harness-driver.ts`: the `PROVIDER_STATE_INCOMPATIBLE` doc now names
the moved-workspace case.
- `codex-boundaries.ts`: working-directory errors say "Agent working
directory", "Remote agent working directory" and "Provider thread
response" instead of "Codex". Tests updated to the new text.
- Tests:
- `native-session-runtime.test.ts`: the real app-server backend with
`remote_runner` authority and a moved root, for each recovery policy.
Same-session policies end with `native_provider_state_incompatible`, the
replacement policy opens a replacement in the assigned root, an
in-flight turn ends with `native_provider_side_effect_pending` under
every policy, and no transport starts.
- `native-backend-factory.test.ts`: the decline carries the failure
class, and an ACPX Claude refusal reads "Remote agent working directory
does not match the assigned workspace".

Previous-release story: no persisted shape changes. Saved checkpoints
are classified at recovery time. A saved same-session checkpoint under
an old root now ends with the named permanent code instead of a generic
one.

## Verification

- Red: without the failure classes, the same-session and in-flight
runtime cases fail (generic `native_session_recovery_failed`). Before
the rename, the ACPX Claude message test fails.
- Green: `cd packages/paperclip-runner && npx vitest run src/backends
src/drivers/codex src/live/runner-prepared-launch-workspace.test.ts
src/native-session-runtime.test.ts` passes (784 tests).
- `npx tsc --noEmit -p packages/paperclip-runner` passes.
- Existing server coverage for the code: `native-session-resume.test.ts`
(no rebind after `native_provider_state_incompatible`) and
`native-session-executor.test.ts` (source-code mapping).

## Risks

- Low. Error message text changes. A search found no code that matches
on the old text outside the updated tests.
- Same-session checkpoints with a moved root now stop for a board Retry
instead of a generic interruption. That is the intended behavior: a
retry cannot succeed.

> 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, used through Claude
Code with tool use (shell, file edit, 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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude <noreply@anthropic.com>
2026-11-11 00:14:03 -06:00
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