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Nicky LeachandPaperclip
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## Thinking Path > - Paperclip is an open source app that manages AI agents for work > - Paperclip runs agents in local and remote sandbox environments > - A sandbox needs a bounded channel for commands and asynchronous input > - Daytona needs a real pseudo-terminal transport for this channel > - The sandbox gateway also needs a mode that handles channel loss safely > - This pull request adds the Daytona transport and gateway mode behind a default-off kill switch > - The benefit is a tested foundation for later transport selection ## Linked Issues or Issue Description **Subsystem affected** Cross-cutting (multiple of the above): sandbox providers, plugin SDK, server settings, and shared types. **Problem or motivation** The merged sandbox protocol has no runtime transport for Daytona. The generated sandbox gateway also has no duplex mode. A later transport-selection change needs both parts and a safe per-run gate. **Proposed solution** Add a Daytona `duplexCommandStream` transport over a raw pseudo-terminal. Add a generated gateway mode named `duplex_v1`. Add the `enableSandboxDuplexBridge` setting with a default value of `false`. Keep transport selection disabled until a later pull request. **Alternatives considered** Keep the protocol unused until the transport-selection change. This would delay provider tests and leave the gateway path without direct coverage. **Roadmap alignment** This change supports the completed Roadmap item for cloud and sandbox agents. It extends the merged sandbox channel foundation in pull request #11738. **Additional context** The Daytona provider remains an untrusted boundary. Deployments must use least-privilege provider credentials and provider-side quota controls. Operators must name an owner for duplex telemetry retention before rollout. ## What Changed - Add the Daytona `duplexCommandStream` capability over a raw pseudo-terminal. - Add a launch wrapper that disables echo and newline translation for NDJSON frames. - Close channels on lease release, destroy, resume of a stopped worker, and worker shutdown. - Declare the capability in the Daytona manifest and set `PLUGIN_VERSION` to `0.1.5`. - Add the worker-to-host notification sink at `ctx.duplexChannel.data` and `ctx.duplexChannel.exit`. - Add the generated sandbox gateway mode `PAPERCLIP_API_BRIDGE_MODE=duplex_v1`. - Add channel-loss results of `409 outcome_indeterminate` and `503 bridge_unavailable`. - Add the per-run setting `enableSandboxDuplexBridge`, with a default value of `false`. - Add unit tests, generated-source codec tests, lifecycle tests, and a credential-gated live Daytona test. ## Verification - Daytona suite: 185 tests pass. - Adapter utilities: 754 tests pass and 4 tests skip. - Plugin SDK: 62 tests pass. - Shared package: 28 tests pass. - Server duplex tests pass. - Shared, plugin SDK, server, and Daytona TypeScript checks pass. - The live Daytona test passes 3 cases when `DAYTONA_API_KEY` is set. - The live Daytona test skips 3 cases without `DAYTONA_API_KEY`. - CI must run the full workspace typecheck, test, and build gates after PR creation. ## Risks - The Daytona control plane and pseudo-terminal remain untrusted boundaries. - The duplex gateway changes behavior only when the mode and per-run setting enable it. - A lost channel fails requests without replay, so callers must handle indeterminate outcomes. - The transport-selection change must require both `duplexCommandStream === true` and `enableSandboxDuplexBridge === true`. - The provider credential and quota limits need operator control before rollout. ## Model Used OpenAI Codex, GPT-5, tool use and code execution. ## 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>