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Nicky LeachandPaperclip
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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Core can give two consecutive runs, A and B, the same hosted Runner so B can continue A’s conversation. > - During that handoff, Core can record that B is next while the Runner still answers as A. > - If Core restarts at that point and tries to connect for B, the Runner rejects the connection. B’s next turn stalls. > - This PR makes Core finish the handoff over A’s connection and check which run the Runner now reports. > - Once the Runner reports B and authenticates B’s connection, B can continue on the same Runner. ## Linked Issues or Issue Description - Refs #17390 for hosted Runner reuse. - Refs #19157 for recovering a stopped Runner session before attaching the next run. ## What Changed - If the Runner still reports A, Core uses A’s connection to acknowledge the result of `run.attach`. This tells the Runner that Core saved the handoff and that it can switch to B. - Core reads the Runner’s saved state and checks it against the recorded handoff. If the Runner already reports B for that handoff, Core connects for B directly. Core waits for B’s connection to authenticate before sending its work. This applies both during an ordinary handoff and after Core restarts. ## Verification - Run `pnpm --filter @paperclipai/paperclip-runner exec vitest run src/live/runnerd-staged-handoff.test.ts` with the native test binaries built. The regression replaces Core at four points in the handoff. Before the fix, Core tried to connect for B while the Runner still reported A. - With the fix, B and a third run each start and finish one turn. The test observes one Runner process, one controlled Codex provider process, and one conversation thread throughout. - All seven handoff cases passed. GitHub CI passed after retrying an unrelated port collision and interrupted jobs. Standard Greptile scored the commit 5/5. [CI run](https://github.com/paperclipai/paperclip/actions/runs/42070818838) ## Risks - The host must be able to read the Runner’s state. If Core cannot verify the switch before the existing deadline, it leaves the handoff pending and sends no work for B. Live hosted verification is still separate. > 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 GPT-6.1 Sol (`gpt-6.1-sol`), high reasoning effort, through Codex with repository tools 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>