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Nicky LeachandPaperclip
8161244284
## Thinking Path > - Paperclip provides a control plane for companies that run AI agents. > - Sandboxed agents need a safe execution path for persistent command streams. > - The existing callback transport does not provide a bounded, generic duplex route. > - The host must control capability access, route identity, protocol limits, and close behavior. > - This pull request adds an opt-in duplex command-stream foundation across the sandbox layers. > - The feature stays inert because no current provider declares the capability. ## Linked Issues or Issue Description **Subsystem affected** Cross-cutting (multiple of the above) **Problem or motivation** Sandbox command execution needs a persistent host-to-sandbox stream. The current callback bridge uses a file transport and does not provide this generic route. **Proposed solution** Add a fail-closed provider capability, generic worker protocol messages, a host-owned bounded route, cross-layer service mediation, and a versioned newline-delimited frame codec. **Alternatives considered** Keep the file transport and add feature-specific commands. This does not provide one reusable duplex contract or host-owned route bounds. **Roadmap alignment** This work supports the completed Cloud / Sandbox agents roadmap area and the safe autonomy goal in the product definition. **Additional context** The change passed a two-stage security review. The final code review verdict was approve after fixes for active-stream bounds and service-layer capability mediation. ## What Changed - Add the opt-in `duplexCommandStream` provider capability with fail-closed narrowing. - Add duplex open, write, stop, and close requests and data and exit notifications to the plugin worker protocol. - Add a host-owned route with bounds for chunk size, cumulative bytes, lifetime, protocol errors, pending requests, and pre-bind buffering. - Add close acknowledgement handling with worker retirement when the close remains unconfirmed. - Wire `openDuplexChannel` through the execution target, runtime service, and plugin worker. - Add a versioned frame codec with shared wire-compatibility vectors and split UTF-8 handling. ## Verification - `server/src/__tests__/plugin-worker-manager-duplex.test.ts` passes 18 tests. - `server/src/__tests__/environment-execution-target-duplex.test.ts` passes 11 tests. - `packages/adapter-utils/src/duplex-frame-codec.test.ts` passes 38 tests. - `server/src/__tests__/sandbox-capability-contract.test.ts` passes 15 tests. - Setup-token pseudo-terminal regression tests pass 47 tests. - Server TypeScript check passes. - Continuous integration will run the full required test, typecheck, build, and policy checks. ## Risks - Providers that opt into the capability must implement the complete worker protocol. - Route limit defaults can close a stream when a workload exceeds the configured bounds. - The capability remains disabled for current providers, so current production behavior does not change. ## Model Used OpenAI GPT-5 (`gpt-5`), with tool use and code execution. The model reviewed and prepared this pull request from the supplied implementation and verification record. ## 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>