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## 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>