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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Native runs start a local `paperclip-runnerd` process. The server records the request to start it, then records its process identity after it spawns. > - If the server is killed between those two records, there is no process ID to check after the restart > - Restart recovery then restarted the bootstrap, but the executor failed with `durable_identity_unreadable` because the runner never wrote its state > - The user's Retry then waited forever with "Retry is waiting for Paperclip to verify that the previous execution stopped", because the stop check needs a process ID > - This pull request restarts that bootstrap and proves on the host that no runner for the run exists > - The benefit is that a restart in the runner launch window no longer loses the task or leaves Retry permanently stuck ## Linked Issues or Issue Description **What happened?** In restart-chaos testing, an ACPX Claude run was created and the server was SIGKILLed 1.3 s later, right after `native.process_start_requested` and before the runner identity was recorded. On restart, recovery claimed `bootstrap_incomplete` (`dead_runner_before_provider_identity`). The executor then threw `runner_state_identity_mismatch: durable_identity_unreadable`: the state root existed, but `control-plane/control-plane-state.json` had never been written. The run failed with `native_continuation_requires_reconciliation`. A Retry was accepted (HTTP 200), but no run was ever created. The issue stayed blocked with `retryWait.reason=process_identity_missing` for over 20 minutes and through another restart. **Expected behavior** When the runner never wrote state, no provider started, so the bootstrap can start again. A Retry should be admitted once the host proves that no runner for the run exists. **Paperclip version or commit** `master` at `fb3cf1a072`. **Steps to reproduce** Create a native local task and SIGKILL the server about 1 s after the run starts, after the runner launch is requested and before its identity is recorded. Restart the server, then click Retry. ## What Changed - `migrateRunnerdStateRootForExecution` (`native-session-executor.ts`): for a `bootstrap_incomplete` restart on a local target, a root is quarantined (kept for inspection) and the bootstrap starts again only when both of these hold: - the root has no `control-plane-state.json`; - no live runner for the run exists on this host. A state file that exists but cannot be read, or a runner that started but has not connected yet, still fails closed with `durable_identity_unreadable`. - `unidentifiedLocalRunnerProvenAbsent` (`native-session-executor.ts`) proves that a runner is absent when both of these hold: - no host process carries the run's `--run-id <runId>` argument (`paperclip-runnerd` is always started with it, detached and unreferenced); - no saved control-plane state for this run exists, in the canonical root or in quarantine. A provider starts only after its runner connects and writes that state. - `native.process_start_requested` now records the launching `hostname`. - `recordUnidentifiedLocalRunnerStop` (`native-local-process-stop.ts`) applies the proof only when all of these hold: - the run is native; - the run has no process ID; - its latest launch event is `native.process_start_requested`, from this host; - all of its leases are local. A launch recorded without a host stays blocked. - The process listing runs asynchronously with a 5 s deadline. A failed or slow listing proves nothing. It then writes `native.local_process_stopped` with null process IDs and `basis: "unidentified_runner_absent"`. A later launch request invalidates it as usual. - The continuation and Retry gate (`explicit-native-continuation.ts`) uses this proof before returning `process_identity_missing`. A dry run checks the proof but records nothing. - `doc/run-log-events.md` documents the new receipt basis. ## Verification - `native-session-executor.test.ts`: - The bootstrap restart with absent state was red before the fix (`durable_identity_unreadable`) and is green after it (root quarantined, backend admitted). - Unreadable state, and a live runner that has not connected, still reject. - Proof cases: absent → true; a live process with `--run-id <runId>` → false; this run's saved state → false; another run ID → false. - `explicit-native-continuation.test.ts` (embedded Postgres, real admission): - The `absent` and `dry_run` cases were red before the fix (blocked) and are green after it (admitted). Only the real admission records the receipt. - The `live_runner`, `saved_state`, `foreign_host` and `unbound_launch` cases stay blocked. - Broader local run after the review fixes: `explicit-native-continuation`, `native-session-executor`, `native-recovered-owner-followup`, `native-runner-restart-recovery.integration` and `task-retry` gave 1836 passed, 0 failed. - A chaos replay of the original task (`--replay w-20261106T232854-s7103/t26`) passed (R1 PASS). Its kill landed after the runner identity was recorded (`resume_dead_runner`), not in the launch window, so the tests above are what reproduce that window. - `tsc --noEmit` for `server` passes. ## Risks - The proof depends on `ps -axww` listing every process on the launching host. If `ps` fails or times out, the proof fails closed (still blocked). Remote runners and other hosts are excluded. - A runner that was spawned but has not yet written its state could be mid-start when admission runs. It would still carry `--run-id` in its arguments, so the proof refuses. - Only the bootstrap path with no state file changes. Ownership, checkpoint and reattach checks are unchanged. > 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, via Claude Code with tool use (shell, file edits, test execution). Extended reasoning enabled. ## 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 Opus 5.5 <noreply@anthropic.com>