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Nicky LeachandPaperclip c5050396c7 fix(daytona-duplex): chunk host-to-sandbox writes and make a transport close legible (#11986 )

## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - Paperclip runs agent work through adapters and sandbox providers
> - The Daytona duplex path sends host input through a provider
pseudo-terminal WebSocket
> - Large messages exceed the provider limit, and a transport close can
look like a process exit
> - This pull request chunks UTF-8 input and carries transport-close
state through the duplex path
> - The benefit is reliable large input and accurate loss reporting

## Linked Issues or Issue Description

**What happened?**

The Daytona duplex path sent a full input payload as one WebSocket
message. A payload above the provider limit closed the channel. The wait
path also mapped a non-numeric exit result to a process exit without
exit data.

**Expected behavior**

The provider must receive large input as ordered UTF-8 chunks. A
transport close without exit data must record `transport_closed`, while
a numeric exit must record `provider_exit`.

**Steps to reproduce**

1. Start a Daytona duplex session.
2. Send an input payload larger than 65536 bytes.
3. Observe that one message closes the provider channel.
4. End a session without a numeric exit code.
5. Observe that the loss reason reports a process exit.

**Paperclip version or commit**

Commit `1761e79ec9097c65d94f90a8ba20416f8ab718a6`.

**Deployment mode**

Built from source with the Daytona sandbox provider.

## What Changed

- Add a shared UTF-8 byte chunker with a 32768-byte cap.
- Route both Daytona pseudo-terminal write paths through the chunker.
- Preserve multi-byte UTF-8 sequences across read-side chunks.
- Carry an explicit `transportClosed` state through the worker and host
wait paths.
- Record `transport_closed` for a reason-less transport close and
`provider_exit` for a numeric exit.
- Keep orderly completion suppression for both exit paths.

## Verification

- The Daytona plugin suite passes 194 tests.
- The adapter-utils broker, codec, and telemetry suites pass 73 tests.
- The plugin SDK duplex and worker RPC host suites pass 37 tests.
- The server plugin worker manager duplex suite passes 78 tests.
- The execution target sandbox and ACPX execute suites pass 257 tests.
- TypeScript checks pass for adapter-utils, plugin SDK, server, and the
standalone Daytona plugin.

## Risks

The chunk size adds a loop for large input payloads. The 32768-byte cap
stays below the provider limit. The optional loss field preserves
compatibility for other providers.

## Model Used

OpenAI Codex, GPT-5, extended reasoning, tool use, and code execution.
The runtime does not expose a separate context-window value.

## 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>

2026-08-22 16:35:47 -07:00

src

fix(daytona-duplex): chunk host-to-sandbox writes and make a transport close legible (#11986 )

2026-08-22 16:35:47 -07:00

CHANGELOG.md

fix: bound workspace Git scans (#11572 )

2026-08-17 22:11:30 -05:00

package.json

fix(build): enforce Node 24 across Paperclip (#11792 )

2026-08-21 10:17:52 -07:00

README.md

PAPA-430: workspace finalize gates + no-remote-git enforcement (#6969 )

2026-05-29 08:25:29 -07:00

tsconfig.json

Fix root TypeScript solution config

2026-03-09 14:09:30 -05:00

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.