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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The Rust runner now has bounded ACPX transport, scope, payload, and provider-neutral normalization layers > - A live provider still needs state across events to correlate requests and preserve turn ordering > - That state must not mutate before scope and payload validation succeeds > - It must bound retained text and pending values, suppress repeated reasoning boundaries, and make one semantic result authoritative > - This pull request adds that reducer without issuing process commands or selecting ACPX in runnerd > - The benefit is a separately reviewable state machine before transport commands and production selection are connected ## Linked Issues or Issue Description Refs #12416 Refs #12415 ## What Changed - Add a package-local ACPX provider state reducer with one run binding and one active turn. - Decode every sidecar event through the existing scope-first payload boundary before state mutation. - Bound retained assistant text, pending semantic tool inputs, and pending runtime request values. - Correlate semantic tool calls, structured input requests, and permission requests by stable IDs. - Keep pending tool resolution two-phase so callers remove state only after a later sidecar command succeeds. - Carry authoritative tool classification from validated payloads into retained state. - Suppress repeated reasoning-start activity within one turn. - Accept one semantic result idempotently and fail closed on a conflicting result. - Flush the final assistant message before the authoritative terminal event. - Clear unresolved turn-scoped requests at terminal state and reject late events for the settled turn. - Admit redacted global process and diagnostic events without requiring an active turn. - Add seven integration tests for turn ordering, correlation, conflicts, scope-before-mutation, redaction, and terminal cleanup. - Document the state boundary. - Do not change dependencies, lockfiles, workflows, runnerd selection, server behavior, UI, or migrations. ## Verification - Replay base: `7bb6cebeae727a16c205bb80b5c2b9e92ea6b5fa` (`master` after #12416 merged). - Exact replay head: `da82e7f67ecd6f0f2184f303b1b703721099cd86`. - Stable patch ID: `3027df409450d08b2c32383585597a39e06c6f53`, identical to the reviewed `f9cb4e54..e6e550f9` delta. - The exact delta is 4 files and 720 additions, all in `packages/paperclip-runner`; it contains no lockfile, workflow, server, UI, or migration change. - Focused Rust state, package, repository, security, and Greptile checks: **PASSED** on the replayed exact head. Full CI run `33362166929` completed successfully, Greptile is exact-head 5/5, all security checks pass, and no review threads remain unresolved. - No local test result is claimed. GitHub Actions is the authoritative verification environment for this replayed revision. ## Risks - This reducer owns security-sensitive correlation and terminal ordering, so its only raw-event entry point always invokes scope-first decoding. - Pending resolution methods must be called only after the corresponding sidecar transport command succeeds; the later process adapter owns that sequencing. - Terminal events intentionally clear unresolved turn-scoped requests so late tool or input results fail closed. - One semantic result remains readable after terminal state for later durable finalization and is cleared only when a new turn begins. - The package exports a new Rust module, but no production path constructs it in this pull request. > 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 with GPT-5.6, 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 (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [ ] 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