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Nicky LeachandPaperclip
b446ff59bf
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Agent adapters run agent sessions through the ACPX engine > - The ACPX engine handled one run attempt as a long implicit procedure > - That shape made resource ownership, cleanup order, and failure behavior hard to verify > - This pull request gives the attempt a coordinator, a typed resource ledger, separate run sites, and explicit turn and settlement sequences > - The benefit is clear ownership, one cleanup path, safer session reuse, and testable failure behavior ## Linked Issues or Issue Description **What existing behavior does this improve?** The ACPX engine manages startup, turn execution, session reuse, and cleanup inside one large run procedure. **Current behavior** The run procedure owns several resources through implicit control flow. Cleanup and session reuse behavior depend on lane-specific branches and error paths. **Proposed behavior** The coordinator owns the run attempt. A typed ledger records six resources and their states. Host and sandbox run sites own lane-specific acquisition. Turn and settlement sequences expose typed outcomes. The engine emits allowlisted phase telemetry. **Reason and benefit** Explicit ownership makes cleanup and failure behavior easier to inspect. The fault matrix and characterization tests protect the external result while the refactor reduces hidden control flow. **Breaking changes** None to the public adapter contract. The host warm-save path now closes and relaunches the runtime because a transferred runtime could retain a run-scoped credential. A cold session-handshake failure now closes the created runtime. **Additional context** This pull request contains the ACPX engine lifecycle refactor, its tests, and the lifecycle document. ## What Changed - Add a run coordinator for startup, turn execution, settlement, and result reproduction. - Add a typed resource ledger with open, sealed, and consumed states. - Add host and sandbox run sites for lane-specific resource acquisition. - Replace separate runtime maps with a generic session reuse store. - Split session fingerprint identity from the outer session key. - Add typed turn and settlement sequences with one cleanup owner. - Add a closed allowlist for phase telemetry. - Add characterization tests and a 17-case fault matrix. - Add `doc/acp-run-lifecycle.md`. ## Verification - `npx vitest run packages/adapter-utils/src/acpx-engine/` passes 18 files and 286 tests at the submitted commit. - `pnpm --filter @paperclipai/adapter-utils typecheck` reports 0 errors at the submitted commit. - Run the full pull request checks after GitHub starts CI. - Run Greptile review after the pull request opens. ## Risks - The refactor changes internal control flow across the ACPX engine. - Host warm-save behavior now closes and relaunches the runtime. - Settlement changes the handling of a cold session-handshake failure from a leak to a close. - The characterization baselines and fault matrix reduce the risk of an external behavior change. > Paperclip is the open source app people use to manage AI agents for work > The adapter layer runs agent sessions through the ACPX engine > The engine needs explicit lifecycle ownership for reliable cleanup > This pull request adds coordinator-owned phases and a typed resource ledger > The result makes lifecycle behavior easier to test and review ## Model Used OpenAI GPT-5 Codex. Exact model ID: GPT-5. The model used tool execution, repository inspection, and code review support. The implementation author supplied the submitted code. ## 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>