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Devin Foley
6401f4f78c
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - An agent that runs in a sandbox has its workspace copied back to the host when the run ends, so its work persists — the copy-back ships a git bundle of the sandbox's commits > - The bundle is created as a thin delta, `git bundle create HEAD --not <baseSha>`, which records `baseSha` (the host workspace HEAD captured at export) as a prerequisite the host must already hold > - That assumption breaks when the sandbox HEAD has diverged from `baseSha`, or when a shared host workspace no longer holds `baseSha` at import time — then `git fetch` on the host hard-fails and the entire run is lost even though the agent finished its work > - This pull request bundles against the merge-base of `baseSha` and the sandbox HEAD (with a full-bundle fallback), which the host can satisfy in those cases > - The benefit is that copy-back no longer discards a completed run's work over a base the host can't reconcile ## Linked Issues or Issue Description **What happened?** A sandbox agent run completed its work, then failed during workspace finalize: ``` git -C <host workspace> fetch --force <git-delta.bundle> refs/…/export:refs/…/imported error: Could not read <baseSha> fatal: revision walk setup failed error: git-delta.bundle did not send all necessary objects ``` The run is reported as `adapter_failed` even though the agent produced output. The copy-back bundle names the host workspace's recorded HEAD (`baseSha`) as a prerequisite, but the host cannot satisfy it. **Steps to reproduce** Two independent triggers, both reproduced in tests: 1. The sandbox's HEAD has diverged from `baseSha` — e.g. the sandbox carries a local-only branch that forked from an older commit than the host's current HEAD. 2. The shared host workspace no longer holds `baseSha` at import time (it was reset / re-realized between export and import). In either case `git fetch` of the thin bundle fails with a missing prerequisite. **Expected behavior** Copy-back imports the sandbox's work as long as the host holds any common ancestor, instead of hard-failing and discarding the run. **Paperclip version** Current `master`. **Deployment mode** Any deployment running agents in sandbox environments with workspace sync (notably shared-workspace clones and custom images that carry a local-ahead branch). ## What Changed - `buildRemoteGitDeltaBundleScript` now computes `bundle_base = git merge-base <baseSha> HEAD` and bundles `HEAD --not <bundle_base>`. The merge-base is an ancestor of `baseSha`, so any host that holds `baseSha` (or an ancestor of it — e.g. after a reset) can satisfy the prerequisite, and the bundle stays a delta rather than a full-history transfer. - When `baseSha` is absent from the sandbox, or no merge-base exists, it falls back to a full, self-contained bundle (no prerequisites) so the import can always complete. - The existing empty-bundle no-op (no new commits) and the ordinary fast-forward path are unchanged; the `cat-file` base check no longer aborts the script under `set -e`. ## Verification - `pnpm vitest run packages/adapter-utils/src/git-workspace-sync.test.ts packages/adapter-utils/src/sandbox-managed-runtime.test.ts` — new cases: a diverged sandbox HEAD imports when the host holds only the merge-base (not `baseSha`), and the full-bundle fallback imports into a host that shares no history; existing thin-delta and empty-bundle cases still pass. - `pnpm --filter @paperclipai/adapter-utils exec tsc --noEmit`. - Standalone shell repro confirmed the old thin bundle fails with "Repository lacks these prerequisite commits" in both trigger cases, and the merge-base bundle imports successfully. ## Risks - Low. For the common case (sandbox HEAD descends from `baseSha`) the merge-base is `baseSha`, so the bundle is byte-for-byte the same delta as before. The change only alters behavior when the old code would have hard-failed. - This makes the copy-back import succeed on a diverged base; the subsequent reconciliation of divergent histories (`integrateImportedGitHead`) is unchanged and still owns how the imported head is merged into the host branch. Where a workspace's history has genuinely diverged (e.g. a stale custom image carrying a local-only branch), a clean re-clone/re-capture is still the right operational fix — this change prevents work loss, it does not reconcile intentional divergence. ## Model Used Claude Fable 5 (`claude-fable-5`, Anthropic) via Claude Code — extended thinking, agentic tool use (file edits, shell repro, vitest/tsc runs). No other models involved. ## 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