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DottaandClaude Opus 5.5
6cfb1f3d87
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - A warm Paperclip Runner session keeps its Daytona sandbox between runs. The next run of the same task resumes that sandbox through a `reuse_by_environment` lease. > - Acquisition only resumes a lease that is `released`, `retained`, or held by the same run. A finished run releases its lease only after it saves its instruction and workspace files, which takes several seconds. > - A board wake that arrives in that window does not see the warm lease. It creates a fresh sandbox. The session's durable backup cannot be restored there, because its source lease is still held. The run fails with `native_session_recovery_failed: runner_harness_state_mismatch: backup_without_reusable_lease` and the task needs Retry, which starts a new provider session. > - This pull request makes acquisition wait, for a short bounded time, for a lease that a recently finished predecessor is still releasing, and then resume it. > - The benefit is that the follow-up continues the same warm session in the same sandbox, with no Retry, no restore and no lost provider context. ## Linked Issues or Issue Description **What happened?** Restart-chaos wave `w-20261111T205259-s6301` (Codex, Daytona warm, volume-free server, `--ephemeral-server` from #20930), task t01. The board re-wake run `e7129ec7` started at 20:57:44. Its predecessor `5cf8c306` reported `run.terminal` at 20:57:38 but saved its instruction copy until 20:57:51, so its warm lease was still `active`. At 20:57:53 the new run recorded `startup reuse: environment (fresh)`. It then failed with `runner_harness_state_mismatch: backup_without_reusable_lease` (error code `native_session_interrupted`). Recording the `workspace_finalize` operation then failed with a Postgres deadlock, and the run settled `native_finalization_missing`. Retry run `79aa18ec` worked with a fresh provider session. The K1 restart in that wave was at 20:55:32 and is not the cause: six warm runs after it reused the sandbox normally. **Root cause** `reusableLeaseCanBeResumed` in `server/src/services/environment-runtime.ts` excludes an `active` lease held by another run. That rule is correct for a running predecessor. For a predecessor that has already ended, the `active` state is a short release tail. The new run creates a sandbox, and `retiredSourceAuthorizesNativeBackupRestore` (`native-retired-backup-source.ts`) correctly refuses to restore the backup from a source lease that is not yet `released` or `retained` (`idleWarmSourceRetiresBackup`). The executor's last branch (`native-session-executor.ts`, host preparation, created allocation) then throws `backup_without_reusable_lease`. **How often** Seen in 2 of 361 retained wave result directories on this machine (`s6301` today, `s5201` earlier). It needs a board wake within a few seconds of the predecessor's terminal event, so it is timing dependent. ## What Changed - `server/src/services/environment-runtime.ts`: add `waitForSettlingReusableLease`. Before the plugin and built-in sandbox paths select a reusable lease, acquisition polls (250 ms) for up to 20 s while a matching `reuse_by_environment` lease is `active` under a different run that is `succeeded`, `failed`, `cancelled` or `timed_out` and finished in the last two minutes. It then continues with the normal selection, which resumes the released lease. - A running predecessor causes no wait (unchanged: the new run gets a new sandbox). A predecessor that ended more than two minutes ago and never released causes no wait. - `server/src/__tests__/environment-runtime.test.ts`: two red/green cases (succeeded and failed predecessor release the lease 400 ms after the successor starts acquiring) and one case for an old unreleased lease (no wait, new sandbox, old lease untouched). - `doc/execution-semantics.md`: describe the wait next to the existing warm-reuse rules. ## Verification - Red on master: `pnpm --filter @paperclipai/server exec vitest run src/__tests__/environment-runtime.test.ts -t predecessor` fails both cases with `expected 'warm-2' to be 'warm-1'`: the successor created a second sandbox instead of resuming the first. - Green: the same command passes (3 tests). `environment-runtime.test.ts`, `plugin-warm-tasks.integration.test.ts` and `environment-run-orchestrator.test.ts` pass (288 tests). Server `tsc --noEmit` passes. - Not verified in a chaos wave. The window is a few seconds wide and appeared in 2 of 361 waves, so one wave cannot show the change. ## Risks - A successor can start up to 20 s later when its predecessor's release is slow. Creating a sandbox and restoring a backup takes longer, and failing needs a Retry. The two-minute bound keeps a stuck, never-released lease from delaying every later run. - If a caller held a lock that the predecessor's release needs, the wait ends at 20 s and acquisition behaves as before. - Compared with #20863 (fresh-sandbox fallback) and #20811 (unsaved provider state marker): this change does not alter either. It reduces how often a warm continuation reaches the fresh-sandbox branch. The backup restore proof is unchanged, so an unproven backup still fails closed with a working Retry. - The `workspace_finalize` deadlock in the same run is a separate defect and is not fixed here. ## Model Used - Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, through Claude Code with tool use (shell, file edit, test runs). Default context window, extended reasoning on. ## 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>