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## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - The Daytona sandbox provider copies the agent's workspace back to
the host after each turn (syncOut)
> - When the sandbox `tar` fails in the `archive_create` step, the
restore diagnostic records only `exitCode: 2` and `errorCode: "unknown"`
> - The command output is not sent across the plugin RPC boundary, so an
operator cannot tell a full disk from a permission error or a path that
is too long
> - This pull request maps the system error text at the end of a failed
sandbox command's output line to the existing allowlisted `errorCode`
> - The benefit is that the next failure records the real errno, and the
output text stays private
## Linked Issues or Issue Description
Refs #18172
Refs #18212
**What happened?**
A hosted Daytona run failed its workspace restore. The `archive_create`
step exited 2 on all three attempts. The run log recorded
`{"step":"workspace_transfer","transferStep":"archive_create","transferFailureKind":"command_failed","exitCode":2,"errorCode":"unknown"}`.
Two causes are possible. The sandbox disk was full, or a path was longer
than PATH_MAX, for example from deeply nested GitHub helper config
directories before #18212. The diagnostic cannot tell these causes
apart.
**Expected behavior**
A failed sandbox command records a bounded errno such as `ENOSPC`,
`EACCES` or `ENAMETOOLONG` when its output shows one. The output text
itself must not be recorded.
**Steps to reproduce**
1. Run `performSyncOut` against a sandbox whose `tar -c` exits 2 with
`tar: ./x: Cannot open: Permission denied`.
2. Read the environment sync diagnostic from the thrown error.
3. See that `errorCode` is `unknown`.
**Paperclip version or commit**
`master` at 3fca8a1.
## What Changed
- `packages/plugins/sandbox-providers/daytona/src/file-sync.ts`:
`assertSandboxCommandOkWithOutput` maps the strerror suffix of a failed
command's output to an allowlisted errno. It reads only the last 16 KiB
in memory. A line must end with `: <message>`. Fatal causes are checked
first (ENOSPC, EIO, ENAMETOOLONG, EACCES, EPERM, ENOTDIR, EISDIR,
ENOENT), so a warning about a vanished file does not hide the error that
stopped `tar`. The error message, capacity fallback (#18172), restore
and retain-on-failure behavior do not change.
- `packages/plugins/sdk/src/environment-sync-error.ts` and
`packages/adapter-utils/src/workspace-restore-diagnostics.ts`: add
`ENAMETOOLONG` to both allowlists. Both sides still validate
independently.
- Tests: 7 new Daytona cases, plus one allowlist case each in the SDK
and adapter-utils.
## Verification
- `vitest run --config
packages/plugins/sandbox-providers/daytona/vitest.config.ts
packages/plugins/sandbox-providers/daytona/src/file-sync-diagnostics.test.ts`:
18 passed. Without the `file-sync.ts` change, the 7 new cases fail with
`errorCode: "unknown"`.
- `packages/plugins/sdk`: `vitest run
tests/environment-sync-error.test.ts`: 20 passed.
- `packages/adapter-utils`: `vitest run
src/workspace-restore-diagnostics.test.ts`: 50 passed.
- `tsc --noEmit` passes for the SDK and adapter-utils. `git diff
--check` is clean.
- I did not run the Daytona package typecheck or its full suite locally
because the sandbox disk was full. CI covers them.
## Risks
- Low risk. The change adds a diagnostic field only. Control flow, error
messages and the capacity fallback regex do not change.
- Localized `tar` output does not match, so it stays `unknown`. That is
the current behavior.
- `ENAMETOOLONG` is a new allowlisted code on both sides. It is a fixed
string and carries no path or output text.
## Model Used
- Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, with tool use and code
execution in an agent harness.
## 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
- [ ] 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>