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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Remote workspaces save a task's files as snapshots. Runtime state under `.paperclip-runtime` is never in a snapshot, because it belongs to the sandbox > - #19231 lets a parent task on a retained sandbox restore newer child work over its own retired workspace root > - That replace removed the whole retired root, including the parent's retained runner session state under `.paperclip-runtime/paperclip-runner/` > - The parent's native continuation then reads that runner state on the resumed sandbox, cannot find it, and fails with `runner_remote_state_unavailable` > - This pull request moves the retired root's runtime state into the restored root before it removes the retired root > - The benefit is that delegating parents on retained sandboxes continue their session with the children's saved work ## Linked Issues or Issue Description Refs #19231 **What happened?** After #19231, a parent task on an agent with a retained sandbox delegates two subtasks. Both subtasks finish. The parent's wake run now restores the newer saved work successfully, but the run fails right after with `runner_remote_state_unavailable: exit=1 timedOut=false`. The run error code is `native_continuation_requires_reconciliation` and the task becomes `blocked`. In one staging wave, 4 of 4 such parents failed. Root cause: the native continuation on a resumed sandbox reads `<remoteCwd>/.paperclip-runtime/paperclip-runner/sessions/<session>/runner/runner-state.json`. Snapshots exclude `.paperclip-runtime`, so the restored root has only the new restore receipt. #19231 parked the retired root and then removed it, so the runner state was removed too. **Expected behavior** The restored root has the newest saved files and the sandbox's retained runtime state. The parent's continuation reads its runner state and continues. **Steps to reproduce** 1. Prepare a remote workspace on sandbox A. Write files and runner state under `.paperclip-runtime/paperclip-runner/`. Save. 2. Make a second run the writer on sandbox B. It restores, writes new files, and saves. 3. Make a third run the writer on sandbox A again and prepare. The restore replaces the retired root. 4. Read the runner state with `readRemoteRunnerState`. Before this change, it fails with `runner_remote_state_unavailable: exit=1 timedOut=false`. **Paperclip version or commit** `master` at `26391707fb`, which includes #19231. ## What Changed - `server/src/services/remote-workspace-transport.ts`: before it removes the retired root, the restore script moves each entry of the retired `.paperclip-runtime` into the restored root's `.paperclip-runtime`. It does not move `workspace-ready.json`, `workspace-restored.json`, or `workspace-snapshots`, and it does not replace an entry that already exists. The move is a rename, so it keeps sockets and large session state. The script also finishes an interrupted carry when the same restore repeats. Only an authorized replace with that restore identity creates the `<root>.retired-<identity>` path. - `server/src/services/remote-workspaces.integration.test.ts`: the retained-sandbox regression now writes parent runner state, restores newer child work, and reads the state with the same `readRemoteRunnerState` call that the continuation uses. It also covers an interrupted carry on a repeated restore. - `doc/execution-semantics.md`: document that runtime state moves with the restored root. ## Verification - Red before the fix: `npx vitest run src/services/remote-workspaces.integration.test.ts -t "retired root"` failed in the `own retired root`, `own restored root`, and `read-only folder` cases with `Error: runner_remote_state_unavailable: exit=1 timedOut=false`. This is the same error as the staging failure. - Green after the fix: all nine cases pass. The continuation read returns the parent's runner state. The old `workspace-ready.json` is gone and the new restore receipt is present. A repeated restore finishes an interrupted carry and removes the retired root and its stale files. - `npx vitest run src/services/remote-workspaces.integration.test.ts src/services/remote-workspace-transport.test.ts src/services/heartbeat/run-completion.test.ts`: 250 passed. - Staging evidence (read-only): the failed parent wake run recorded a succeeded `remote_workspace_restore` at the parent's own provider lease, and then failed in the runner-state read. - I did not run a live staging run. This PR does not deploy. ## Risks - Runtime state from the retired root now persists into the restored root. The state is the sandbox's own state for this workspace path, which is the same state that a same-allocation reuse keeps. - If the restored root already has an entry with the same name, the old entry is not moved and is removed with the retired root. ## Model Used - Claude Opus 5.5 (`claude-opus-5-5`), Anthropic. It used tool use for code search, shell, test runs, and read-only staging inspection in the browser. ## 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>