DottaandClaude Opus 5.5
c45c7cb854
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - A native run in a remote sandbox copies its workspace back to the host after the turn. A sparse checkpoint copies only changed entries, and the host validates each entry against the sandbox's own manifest > - Every Daytona transfer stages a `.paperclip-upload-<uuid>` scratch file at the sandbox workspace root and removes it only in the same process > - A control-plane kill during any transfer leaves that scratch behind. The sparse checkpoint then recorded it as a workspace file, but providers never export it. Every later copyback and every saved-work recovery attempt failed with "Workspace checkpoint payload mismatch" > - The failed recovery then left an accepted Retry showing "Paperclip is finishing the saved result" with no run > - This pull request stops recording transfer scratch, makes the checkpoint export an exact copy, names the failing entry, and gives a Retry behind a spent recovery an honest reason and a working action > - The benefit is that a restart during a transfer no longer makes a task's saved work permanently unrecoverable ## Linked Issues or Issue Description Refs #19721 (RC-50: the killed copyback owner; this PR covers the separate RC-50b cause) **What happened?** Restart-chaos waves s12/t01 and s14/t05 (Claude on Daytona). After a SIGKILL of the control plane, the native result was accepted, and then workspace copyback failed with "Workspace checkpoint payload mismatch". In s14 all 6 saved-work recovery attempts failed the same way. A Retry accepted during recovery kept `retryWait.reason = finalizing_saved_result` after the recovery budget was spent. No run was created. **Steps to reproduce** 1. Start a native Claude run in a Daytona sandbox. 2. SIGKILL the control plane while any provider transfer is in flight. 3. Let the run finish its turn and copy its workspace back. **Expected behavior** Copyback succeeds. Provider scratch is not workspace content. A Retry behind a spent recovery names the failure and can start a new recovery. **Actual behavior** The s14 sandbox (6f4a0b6a) still held `/home/daytona/paperclip-workspace/.paperclip-upload-d99fe36b-5acc-437b-96ad-85d5ff9e79c4.tar`. Its mtime was 03:29:23, the second of the K4 SIGKILL. The Daytona provider stages transfer scratch at `remoteDir`, which is the lease `remoteCwd` (the workspace root). The runtime workspace wipe deliberately preserves `.paperclip-upload-*`. The checkpoint helper (`workspace-checkpoint.ts`, `checkpointMain`) recorded the stale tar. The ordinary export excludes `.paperclip-upload*`, so the host received nothing for that entry. `validateCheckpointPayload` then threw "payload mismatch" on every attempt. The file-mode hypothesis was disproved: the sandbox umask is 022 and the scratch is mode 644. ## What Changed - `packages/adapter-utils/src/exclude-patterns.ts`: new `isSandboxTransferScratchPath`, which matches a root-level `.paperclip-upload-*` entry. This agrees with the wipe's preserve rule in `buildWorkspaceTarExtractCommand`. - `packages/adapter-utils/src/workspace-checkpoint.ts`: the sandbox checkpoint helper skips that scratch. A mismatch error now names the entry and its recorded, baseline and received forms (kind, octal mode, short hash; never contents). - `packages/adapter-utils/src/sandbox-managed-runtime.ts`: the checkpoint export requests `preserveSourceEntries: true`. The checkpoint output is an exact copy that the host validates entry by entry. An ordinary export applies the host umask and drops `._*` and `.paperclip-upload*` names at any depth. That gives the same permanent mismatch for a legitimate user file such as `._summary`, `notes/.paperclip-upload-plan.md`, or a `0775` script. - `server/src/services/explicit-native-continuation.ts` and `task-interruption-presentation.ts`: when the run's saved-work recovery is exhausted, a waiting Retry reports `saved_work_recovery_failed` with Retry available, instead of `finalizing_saved_result`. The existing task Retry path starts one new recovery generation. - `doc/execution-semantics.md`: a short additive note. ## Verification - `packages/adapter-utils/src/workspace-checkpoint-capture.test.ts` uses the real checkpoint helper and an export that behaves like Daytona's ordinary export: - Before the fix: `Workspace checkpoint payload mismatch at ".paperclip-upload-d99fe36b-….tar": sandbox recorded file mode=644 …; baseline absent; received absent`. That is the wave error. - After the fix: the scratch is not recorded, and validation passes. - A second case shows that reserved-looking user names and `0775` modes need the exact export. - `packages/adapter-utils/src/workspace-checkpoint.test.ts` is an end-to-end `prepareSandboxManagedRuntime` restore through a provider model. In that model, ordinary exports drop reserved names and apply the umask, and preserve exports copy exactly. Two red checks: - Without `preserveSourceEntries`, it fails with the mismatch on `._summary`. - Without the scratch skip, the stale tar leaks into the host workspace. - Green: the agent file, the `._summary` file and the `0775` mode arrive, and no scratch arrives. - `server/src/services/workspace-recovery-preparation-gates.test.ts`, "names a spent saved-work recovery behind an accepted Retry, and the next Retry finishes it" (s14 shape): - Red: `finalizing_saved_result` after 6 failed attempts. - Green: `saved_work_recovery_failed` with `canRetry: true`. The next Retry starts a new generation, recovery completes, and the Retry continues in exactly one new run. - Suites: adapter-utils checkpoint, capture, sandbox-managed-runtime, seed-reuse and managed-seed (168 passed). Server preparation-gates (47), explicit-native-continuation and task-interruption-presentation (455), workspace-recovery admission and retry-copyback, and native-workspace-finalizer. `tsc --noEmit` is clean for adapter-utils and server. - Live evidence: I started the stopped s14 sandbox read-only, listed its workspace, and stopped it again. No Daytona replay was run. The runner content ID of this checkout matches no built image. ## Risks - A user file named `.paperclip-upload-*` directly at the workspace root is no longer captured by a sparse checkpoint. Providers already drop that name from every ordinary export, and the runtime already reserves it at the root. - The checkpoint export now uses the provider's exact-copy mode. A workspace file with setuid, setgid or sticky bits is refused by that mode, as it is for the existing exact-copy transfers. The ordinary export would have stripped those bits and failed validation anyway. - The stale scratch tar stays in the sandbox. It is ignored, not deleted, because a concurrent transfer can own a file with the same prefix. ## Model Used - Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, through Claude Code with tool use (shell, file edits, test runs, embedded Postgres, a read-only Daytona sandbox listing). ## 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 - [ ] 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>
@paperclipai/adapter-utils
Shared utilities for Paperclip adapters: process spawning, environment injection, sandbox/SSH transport, workspace sync, and the round-trip helpers that move code between the local execution-workspace cwd and wherever the agent actually runs.
For the adapter-author guide see
docs/adapters/creating-an-adapter.md
and the in-repo notes at packages/adapters/AUTHORING.md.
Sandbox bridge deadlines
Command-managed bridge control operations (queue reads, input delivery, setup, and cleanup) have a host-enforced deadline of at most 30 seconds per shell command. A shorter configured timeout still applies. These operations cannot inherit the agent run's hours-long lifetime or wait forever on a provider that ignores its timeout. Long-lived agent session commands keep their own limits.
A control timeout reports a transport failure. It does not prove that the remote command stopped and does not replay an uncertain write. The process session closes failed input delivery and uses its existing shutdown path; normal execution settlement must still verify termination.
Native archive transfer deadlines
Native syncIn and syncOut calls accept an optional minimumTimeoutMs budget. The
server validates this budget and extends the worker RPC deadline. Providers can
honor this field for file transfers without changing their configuration. Daytona
uses the larger of this minimum and its configured timeout. Other providers keep
their existing behavior. The minimum is limited to 30 minutes and does not change
sandbox lifetimes, stored settings or the timeout for other commands.
The remote-workspace archive path uses the verified capture size for downloads and the local archive size for uploads. Large archives get one second per MiB plus 60 seconds, capped at 30 minutes. Small archives keep the existing provider timeout when that calculation is no greater than five minutes. Archive size, checksum, confinement and host space checks still apply.
An exact retained-sandbox resume keeps its recorded provider timeout and RPC overhead. It uses the normal one-minute fallback only when no timeout was recorded. A five-minute cold restore must not be cut off by that fallback. Resume still targets the recorded allocation and does not acquire a replacement.
No-remote-git contract
The local execution-workspace cwd is the only persistence boundary across runs. No adapter may depend on a git remote for cross-run state.
Adapters that run the agent on a different host should use the SSH round-trip
helpers in src/ssh.ts:
prepareWorkspaceForSshExecution({ spec, localDir, remoteDir })— bundles the local cwd (tracked files, dirty edits, untracked additions, and the git history needed to reconstruct it) toremoteDirbefore the run starts. Runs with nogit remoteconfigured.restoreWorkspaceFromSshExecution({ spec, localDir, remoteDir, ... })— syncs the remote cwd back intolocalDirafter the run, including any new commits the agent created. Also runs with nogit remoteconfigured.
prepareRemoteManagedRuntime in
src/remote-managed-runtime.ts wraps both
calls for adapters that want a per-run remote workspace and an automatic
restoreWorkspace() finally hook.
The invariant is pinned by the no-remote-git contract case in
src/ssh-fixture.test.ts, which asserts that a
remote-only commit propagates to the local worktree through the
prepare → restore round-trip with no git remote configured at any point. Do
not regress that test.