## Thinking Path > - Paperclip manages AI agents and the work they produce. > - Sandbox work must return to the host when an agent run ends. > - A failed transfer must keep its source available for recovery. > - Some transfer errors lose their useful fields before restore diagnostics reach Sentry. > - This change records fixed transfer stages, failure kinds, and numeric RPC codes. > - The next failure can identify the operation that failed without exposing workspace contents. ## Linked Issues or Issue Description **What happened?** A workspace transfer can fail after model execution succeeds. Several command, archive validation, and download errors become plain errors. The existing RPC envelope then reports `unknown`, with no transfer stage or command exit code. A host RPC timeout also loses its code from restore diagnostics. **Expected behavior** Keep bounded evidence through the provider, worker RPC, restore result, and Sentry context. Keep the same exception, error message, retry rules, and source retention policy. A transfer timeout must remain separate from the model execution timeout flag. **Steps to reproduce** Return a nonzero exit code from the sandbox archive command, return a per-file download error, exceed a tar listing limit, or time out the sync-out RPC. Observe the missing fields in the saved restore diagnostic. The added tests use local fixtures for these cases. Related public work: #15479 preserves the source after restore failure. #15481 carries bounded sync-out diagnostics through RPC. This change supplies missing producer evidence and extends that same envelope. I checked the roadmap and searched open PRs for duplicate transfer diagnostic work. ## What Changed - Add optional transfer stage and failure kind fields to the existing diagnostic envelope. Capture command exits and listing deadlines at their producers. - Record only known codes from typed RPC errors at the sync-out boundary. Revalidate every field before persistence and Sentry projection. - Keep annotations private to each outbound request and restore settlement. Preserve frozen error identity and prevent evidence from leaking across concurrent or later calls. - Document the fields. Cover producer failures, quota limits, old workers, concurrent error reuse, and redaction through the real Sentry SDK. ## Verification - Focused SDK, provider, host, persistence, and real Sentry tests: 449 passed, no skips. Independent review also ran the focused contracts and all provider tests. The optional Sentry SDK is required for this check, so the contract tests cannot skip. - A compiled Daytona transfer and compiled SDK worker pass a local RPC round trip. This uses the development TypeScript loader for workspace dependency exports. The transfer and capture modules are compiled JavaScript. - `pnpm -r typecheck` and `pnpm build` passed. The excluded Daytona package also passed `tsc --noEmit`. - The initial local `pnpm test:run` stopped in the general-server group: 60 suites could not initialize embedded PostgreSQL because the isolated install skipped its Darwin library-link setup. The existing package postinstall repairs this; `initdb --version` now passes. All 60 affected suites then passed: 1,342 tests, no skips. No local full aggregate pass is claimed. - Independent source review covers privacy, concurrency, packaging, and recovery behavior. ## Risks - These diagnostics help identify future failures. They do not establish or repair the cause of a past transfer failure. - New fields are optional. Older workers remain compatible. Unknown values are omitted. - The change adds a small request-local diagnostic scope. It keeps the original thrown errors, archive confinement, cleanup order, timeout values, retry count, and source retention policy. - No schema or deployment changes are required. No live provider actions are part of validation. ## Model Used OpenAI Codex, based on GPT-6, with repository inspection, code execution, and independent agent review. The exact deployed model ID and context-window size are not exposed in this session. ## 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 - [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 --------- Co-authored-by: Paperclip <noreply@paperclip.ing>
@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.
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.