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Nicky Leach 8f478242f1 fix(adapter-utils): close sandbox stdin file race with atomic write and fault-tolerant poller (#11235 ) ## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Agent adapters use execution targets to exchange input and output with sandbox processes > - The sandbox input path can expose partial files, and the poller can delete or stop on invalid input > - These timing windows can lose agent input without a clear error > - This pull request makes host writes atomic and makes the poller retry invalid files before it drops them > - The benefit is reliable sandbox input delivery with visible failure after bounded retries ## Linked Issues or Issue Description Closes #10874 ## What Changed - Decode host input into a temporary file, then rename it onto the final JSON path. - Apply the same atomic write pattern to the filesystem client. - Parse each input file before deletion. - Retry parse failures and drop a file after the bounded retry limit with an error event. - Add regression tests for empty, partial, and permanently malformed input files. ## Verification - `pnpm exec vitest run packages/adapter-utils/src/execution-target-stdin-race.test.ts` passes 5/5 tests. - Related sandbox callback, execution target, and sandbox execution suites pass 71/71 tests. - TypeScript checks pass for the changed files. - The regression suite fails on the old code and passes on this change. ## Risks - Low risk. The change affects sandbox input file handling and adds bounded retry behavior. - A permanently malformed file now creates an error event after the retry limit. > This bug fix does not add a core feature, so a roadmap change is not needed. ## Model Used Codex, OpenAI GPT-5, current agent runtime, large context window, tool use and code review support. ## 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 --------- Co-authored-by: Paperclip <noreply@paperclip.ing>		2026-08-11 16:05:41 -07:00
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src	fix(adapter-utils): close sandbox stdin file race with atomic write and fault-tolerant poller (#11235 )	2026-08-11 16:05:41 -07:00
CHANGELOG.md	…
README.md	…
package.json	…
tsconfig.json	…

README.md

@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.

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) to remoteDir before the run starts. Runs with no git remote configured.
restoreWorkspaceFromSshExecution({ spec, localDir, remoteDir, ... }) — syncs the remote cwd back into localDir after the run, including any new commits the agent created. Also runs with no git remote configured.

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.