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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The Paperclip Runner package needs one provider-neutral session loop > - Native execution contracts now define the accepted input and output > - Backends still need bounded execution, recovery, and control-plane ports > - This pull request adds that package-local session runtime > - It does not change server runtime selection or start the experimental runner > - The benefit is a tested execution core for later provider and server layers ## Linked Issues or Issue Description **Subsystem affected** packages/paperclip-runner **Problem or motivation** The runner contracts do not yet have a shared session loop. Each backend would otherwise duplicate event handoff, terminal handling, recovery cursors, timeouts, and checkpoint behavior. **Proposed solution** Add the native session runtime, backend interfaces, control-plane port, harness driver contract, deterministic conformance helpers, and bounded tests. **Alternatives considered** The server could own this loop. That would mix provider process behavior with server persistence and authority logic. **Roadmap alignment** This is part of the existing experimental Paperclip Runner rollout. It does not enable a production adapter. ## What Changed - Add a provider-neutral native session execution loop. - Add recovery cursor reconciliation and checkpoint hooks. - Add bounded timeout and governed-wait behavior. - Add harness driver and control-plane conformance helpers. - Add deterministic backend and session runtime tests. ## Verification - `pnpm --filter @paperclipai/paperclip-runner test:typescript` - `pnpm --filter @paperclipai/paperclip-runner typecheck:typescript` - `pnpm -r typecheck` - `pnpm build` - Protocol generation and manifest checks pass. - The branch changes 14 files relative to its declared base. ## Risks The main risk is a session that hangs, duplicates an event, or restores the wrong cursor after reconnect. Tests cover terminal events, timeouts, durable handoff, duplicate receipts, recovery, continuity breaks, and checkpoint updates. The change remains package-local. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used OpenAI Codex, `gpt-5`, with agentic reasoning, 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 and contains no internal Paperclip ticket id - [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