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DottaandClaude Opus 5.5
38944cff1a
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - A task that runs on a reusable (warm) cloud sandbox resumes the same sandbox on the next wake > - When a follow-up arrives while the provider is auto-stopping or archiving the idle sandbox, the resume can fail > - Each failed attempt waited the provider's whole five-minute start deadline and then failed with `reusable_sandbox_resume_failed`, even when the workspace was saved and nothing lived only on the sandbox > - Two such runs in a row made a user wait for many minutes and recorded two failed runs > - This pull request bounds the resume, retries a state change inside the run, and replaces the sandbox from the saved snapshot when that is safe > - The benefit is that recovery works automatically and the first turn is not delayed by minutes ## Linked Issues or Issue Description **What happened?** Two consecutive runs failed before provider dispatch with: `Reusable sandbox lease "<id>" could not be resumed (cause=provider_error); the lease was preserved and no replacement was created.` Each run took about 5.5 minutes (320s and 330s) in preparation. The third run resumed the same sandbox from `stopped` in 4.7 seconds after the provider settled. The previous run had ended with a clean final save and a verified harness backup. **Steps to reproduce** 1. Let a task's reusable sandbox go idle so that the provider auto-stops or archives it. 2. Send a follow-up while the provider still reports the sandbox as changing state. 3. The Daytona worker waits in `ensureSandboxStarted` until its 300s start deadline and throws "is still <state> at its start deadline". The host does not classify that as transient and it has no safe fallback, so the run fails. **Expected behavior** The run retries briefly. If the sandbox still cannot start and nothing lives only on it, the run continues on a replacement sandbox that restores the saved workspace. **Root cause** `server/src/services/environment-runtime.ts` (reusable resume block, about line 1820): the resume deadline was the provider's full start deadline (300s plus RPC margin), the transient classifier did not recognize a state transition, and the catch always threw `ReusableSandboxResumeError`. #20212 waits out a state change inside the same 300s start deadline, so it covers the start but not the time budget or the fallback. ## What Changed - Add `server/src/services/reusable-sandbox-resume-replacement.ts`: - `REUSABLE_SANDBOX_RESUME_BUDGET_MS` (90s): the total resume time for one run, retries included. - `sandboxStateTransitionFailure`: "state change in progress" and "is still <state> at its start deadline" are transient. - `retireUnresumableReusableSandboxLease`: replace only when the lease is `released`/`retained` with no live owner, the task workspace is clean with a committed saved snapshot and no other writer, and a `paperclip_runner` session has a verified lease-bound harness backup. Access refusals (401/403) and an unavailable worker stay strict. After the replacement lease (which carries the harness backup) is recorded, the old lease moves to `pending_cleanup` (reason `resume_failed`) in one guarded write, so the existing cleanup sweep destroys the old sandbox and no provider delete runs before the first turn. A failed creation or a restart before that write leaves the old lease `retained` for the next attempt. - `environment-runtime.ts`: cap the resume deadline at the budget, treat a state transition as transient, and call the replacement policy before failing. A replacement records `sandboxLeaseAcquisition: { outcome: "replacement", reason: "resume_failed" }`; workspace preparation then restores the saved snapshot. - `remote-workspace-transport.ts`: add the closed failure label `sandbox_state_transition`, so a strict failure names the cause instead of `provider_error`. - `doc/execution-semantics.md`: document the budget, the in-run retry, the replacement conditions, and the strict cases. - Update the two slow-start tests: the resume RPC timeout is now 90s instead of 330s/150s. A 61s start still resumes the same sandbox. ## Verification - Red before the fix (new file `server/src/__tests__/environment-runtime-reusable-resume-replacement.test.ts`, staging shape: lease created by the real acquisition path, then retained after a clean save with a backup stamp, 300s provider deadline, worker refusal with no status): 3 tests failed with `could not be resumed (cause=provider_error); the lease was preserved and no replacement was created.` - Green after the fix: 10/10 pass, including a case where the replacement creation fails and the next run replaces the sandbox with the backup carried forward. The safe case replaces the sandbox, keeps every resume RPC at or below 90s, makes no synchronous destroy call, and moves the old lease to `pending_cleanup`. A single state-change refusal resumes the same sandbox inside the run. Six strict cases keep the lease and fail with `cause=sandbox_state_transition`: unsaved work, no saved version, an uncommitted saved version, a live owner, no verified backup, and a 403. - `pnpm exec vitest run src/__tests__/environment-runtime.test.ts` (197 pass), `heartbeat-retry-scheduling`, `legacy-execution-recovery`, `remote-workspace-transport` (251 pass). - `tsc -p server/tsconfig.json --noEmit` passes. - `pnpm verify` exits 2 (a doc change is a global CI input). Required CI supplies the broad coverage. - Not run: a live Daytona run on staging. The provider message is kept off the run record, so the exact transition state on staging (stopping or archiving) is inferred from timing, not observed. ## Risks - A strict resume now gives up after 90s instead of 300s. The provider start continues in the background, and the bounded bootstrap retry resumes the same sandbox. A stopped sandbox resumes in seconds and an archived one in about 25s on Daytona, so 90s leaves headroom. - A replacement leaves the old sandbox to the cleanup sweep. If the old start finishes later, the sweep still destroys it. The guarded write only claims a `released`/`retained` lease with no live owner. - Upgrade safety: no new persisted fields are required. Leases saved by older releases are read with the same rule; one without a verified backup stays strict. The replacement reason `resume_failed` already exists in the acquisition outcome. ## 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 Opus 5.5 <noreply@anthropic.com>