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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - A native OpenCode run on a remote sandbox must save a provider-pack admission receipt on its run row after the provider session opens. Artifact retention refuses to continue without it. > - The admission write locks the coordinator row (`native_run_finalizations`) and then the run row, each with a 1000 ms `lock_timeout`. The runner's durable checkpoint writes lock the same coordinator row for the whole checkpoint transaction. > - On a loaded database one checkpoint transaction can outlast one lock wait. The admission write then fails with `55P03`, the state stays `pending`, and artifact retention fails the run as `native_provider_artifacts_admission_unverified` before the first turn. The task rests blocked. > - #20682 fixed the same symptom for a run-event append on the run row. This is the coordinator-row half. > - This pull request retries a contended admission write a bounded number of times, each in a new transaction that re-proves the claim. It also names the database cause in the run log and adds a chaos option that makes every fresh sandbox take the pack upload and admission path. > - The benefit is that a healthy fresh sandbox is no longer failed and blocked by ordinary lock contention. ## Linked Issues or Issue Description Refs #20682 (same symptom, run-row lock; this is the coordinator-row lock). **What happened?** On a hosted staging instance, an OpenCode run on a fresh Daytona sandbox found no matching preinstalled provider pack (`provider_pack.select` reason `cached_packs_unverified`). It uploaded and verified the pack (61 s), started the runner, and the runner authenticated to the durable control plane. 3.4 s later the run log shows `native provider-pack admission receipt could not be saved`. `nativeProviderPackAdmissionState.state` stayed `pending`. The run failed with `native_provider_artifacts_admission_unverified` before any provider turn. The task rests `blocked` with no Retry. **Steps to reproduce** 1. Start a native run that waits for its claim (`waitForClaim: true`, as a fresh run with artifact storage does). 2. Hold its `native_run_finalizations` row `FOR UPDATE` in another transaction for 1.6 s, as a checkpoint write does. 3. Call `recordNativeProviderPackAdmission`. It fails with `canceling statement due to lock timeout` (`55P03`). **Expected behavior** The admission waits out the checkpoint write within a bound, re-proves the claim, and saves the receipt. ## What Changed - `recordNativeProviderPackAdmission` retries a write that waits for its claim when it fails with `55P03`, `40P01` or `40001`, up to 5 attempts with 100–400 ms back-off. Each attempt is a new transaction with the same checks (claim, run, epoch, receipt). A stale claim still returns `false`. Other errors still throw. A write that does not wait for its claim keeps its `NOWAIT` refusal. - New `nativeProviderPackAdmissionFailureCode` reads the SQLSTATE from the error or its cause. - The executor's run-log line now ends with `(cause=<SQLSTATE or native_* code>)`, so a lost admission is diagnosable. It carries no paths or secrets. - Restart chaos: `--daytona-pack-mismatch <image@sha256:…>` starts sandboxes from another image while the controller keeps `--daytona-image`'s runnerd and pack. Every fresh sandbox then takes the upload and admission path, which the matched-image check made unreachable. Config validation and README updated. - `doc/execution-semantics.md` describes the bounded retry. ## Verification - RED on `origin/master` (`1d67e309e0`): `pnpm --filter @paperclipai/server exec vitest run src/services/native-runtime/native-provider-pack-admission.test.ts -t "checkpoint write holds"` fails with `canceling statement due to lock timeout` (`55P03`), the staging error. - GREEN: the same file, 39/39 pass, including the existing fence tests (`cannot publish while another transaction holds the coordinator claim`, revoked-claim recheck) and the new bound test (`gives up after the bounded retry window while the claim stays held`, under 15 s). - `pnpm exec vitest run --config tests/restart-chaos/vitest.config.ts tests/restart-chaos/scheduler.test.ts`: 34/34 pass, including the new option test. - `pnpm --filter @paperclipai/server exec tsc --noEmit` and `tsc --noEmit -p tests/restart-chaos/tsconfig.json` pass. - Not run: a Daytona chaos wave with `--daytona-pack-mismatch`. It needs a runner image built at this revision. The staging cause is inferred from the timing and the code path; the original error was swallowed, which is why this PR adds the cause to the run log. ## Risks - Low risk. The normal path has no contention and makes one attempt. Under contention the write waits at most about 11 s before the first provider turn. Without this change that case failed the run. - A retry cannot widen authority: every attempt re-checks the coordinator claim, lease expiry, run status and admission epoch. - When admission still fails after the retries, the run fails as before. This PR does not change that recovery path. > 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, read-only staging API reads). ## 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 Opus 5.5 <noreply@anthropic.com>