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DottaandClaude
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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The native runtime runs each agent task through a Runner. On a graceful shutdown (SIGTERM), the server closes its runtime API listener first, then drains runs. > - A run that is still preparing can reach the runtime API lookup after the listener closed. It then fails with `local_runtime_api_listener_unavailable` before it reaches its Runner. > - For a remote (sandbox) Runner, the executor already settles this failure as a same-run bootstrap retry, so the next server restarts it with no manual Retry. > - A follow-up run is different. Admission rebinds the settled predecessor's provider session into the follow-up's run as its checkpoint. The recovery evidence saw "a checkpoint exists" and called the failure `ambiguous_state`. That blocked the task and the user had to click Retry. > - This pull request recognizes that carried checkpoint. When this server's own listener closed, the run has no Runner checkpoint and no provider event of its own, and a settled predecessor saved that exact provider session, the failure is a same-run bootstrap retry. > - The benefit is that a graceful restart during a follow-up's preparation no longer needs a manual Retry. ## Linked Issues or Issue Description **What happened?** In a Daytona restart-chaos wave (codex, remote sandbox Runner), a follow-up run was created. About 2 s later a graceful SIGTERM drain began. The draining server kept preparing the run. `resolveLocalRuntimeApiUrl()` in `createRunnerdBackendWithinSessionClaim` threw `LocalRuntimeApiListenerClosedError`. The run failed with `local_runtime_api_listener_unavailable`. The task went to `blocked` with a board-owned recovery action, and it needed a manual Retry. The manual Retry worked. **Expected behavior** No provider work started for the run. The next server must pick it up automatically. **Steps to reproduce** 1. Finish a remote native run for a task, so that its provider session is saved. 2. Comment on the task to start a follow-up run. The follow-up carries the saved provider session as its admission checkpoint. 3. Send SIGTERM while the follow-up is in preparation, before it reaches its Runner. 4. The follow-up fails with `ambiguous_state` and the task is blocked. **Paperclip version or commit** `master` at `62b7733161` (wave) and `eb75c9bb85` (this branch base). Refs #20514, #20721 ## What Changed - `native-session-executor.ts` (`nativeProviderRecoveryEvidence`): add one narrow case before the generic checks. When all of these are true, return `bootstrap_retry` (with `checkpointExists: true` and `providerSessionEstablished: false`): - the source failure is `local_runtime_api_listener_unavailable` (this server stopped serving); - the target is remote, the run has the current preparation fencing version, and the run has no Runner controller checkpoint; - the run has no provider event; - the run checkpoint has no cursor, turn, terminal, result, or pending request of its own; - a settled earlier run of the same native session saved that exact provider session. - `native-restart-recovery.ts`: export the existing `carriesSettledPredecessorSession` proof, so that the executor uses the same proof that restart recovery uses for rebound sessions. - `native-controller-recovery.integration.test.ts`: add a regression test. It also shows that the verdict stays `ambiguous_state` for a different failure code, for an unknown provider session, for a checkpoint with its own turn, and for a run with a provider event. ## Verification - Red on master: `cd server && npx vitest run src/services/native-runtime/native-controller-recovery.integration.test.ts -t "own server stopped serving"` returned `recoveryMode: "ambiguous_state", providerSessionEstablished: true`. - Green with the fix: the same file passes (25 tests). - `npx vitest run src/services/native-runtime/native-startup-retry.integration.test.ts src/services/native-runtime/native-runner-restart-preparation.integration.test.ts`: 43 passed (the existing closed-listener bootstrap-retry and ambiguous cases are unchanged). - `cd server && pnpm typecheck`: passed. - Not run: a live restart-chaos wave. ## Risks - Low risk. The new case applies only to the closed-listener failure on a remote target. It needs durable proof that the run has no Runner checkpoint and no provider event, and that the provider session belongs to a settled predecessor. All other cases keep their earlier verdict. - If the retry later finds different evidence, the existing restart recovery and resumption checks re-prove it and fail closed. The task then keeps a working Retry. - Upgrade safety: no persisted shape changes. The proof reads only rows that older servers already write (`sessionCheckpoint`, `nativePreparationFencingVersion`, Runner checkpoints, run events). A run that an older server prepared without the fencing version keeps its earlier verdict. - No waits are added before `turn.start`. The new queries run only on the failure path. ## Model Used - Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, with tool use and code execution in Claude Code. ## 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 <noreply@anthropic.com>