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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - When a restart interrupts a turn, the Runner keeps each Paperclip tool call the model made as "held" until Paperclip answers it, and it refuses to start the next turn while any call is held > - Paperclip answers held calls after a reattach through its tool recovery path. That path was wired only for remote runners > - In restart chaos wave `w-20261109T084023-s9403`, t101 (local codex, K2 then K1) held a `read_document` call that nothing answered, so the continuation's `turn.start` failed and the task needed a Retry > - This pull request wires held-call recovery for local runners too, and makes `turn.start` answer or wait for held calls first > - The benefit is that a turn lost to a restart no longer strands the run behind one unanswered call ## Linked Issues or Issue Description Refs #19831. Restart chaos wave `w-20261109T084023-s9403` (master `fc5c79a327`), task t101 (codex C1, K2, local). **What happened:** - Run `4b5810d5` called `read_document` (`exec-ac8fa9b4`) around the K2 drain at 09:08:18. A K1 then killed the next server start. - At 09:08:36 the third controller reattached. The Runner restored the conversation and reported the old turn lost (`provider_turn_lost_on_restore`, recoverable). The held call stayed pending, by design: a held call accepts a late result. - The controller had the call: the quarantine detail lists `exec-ac8fa9b4` under `semanticTools.pending`. But `recoverPendingSemanticInputs()` returned at once: for a local run `controllerPersistence` is unset, so `recoverSemanticToolInput` was `undefined`. - At 09:08:46 the continuation's `turn.start` failed with "cannot prepare the next provider turn while tool calls are active (pending: 1 [read_document:exec-ac8fa9b4…])". The run ended `native_session_interrupted`. ## What Changed - `server/src/services/native-runtime/native-session-executor.ts`: the runnerd transport now always gets `recoverSemanticToolInput`, not only when `controllerPersistence` (remote) is set. It uses the same epoch check and `SessionAuthorityEpoch.recover`. Recovery re-authorizes and re-runs reads, and replays receipts for mutations; it never repeats an uncertain mutation. - `packages/paperclip-runner/src/live/runnerd-codex-transport.ts` (`#startTurnWork`): when the control plane has unsettled semantic inputs, it runs `recoverPendingSemanticInputs()` before queueing `turn.start`, and waits for that pass, bounded by the turn-start deadline. Recovered results are queued as commands ahead of `turn.start`, and the Runner applies commands in order. If recovery has not finished by the deadline, the turn start fails with `native_turn_start_held_tool_calls_unresolved` instead of sending `turn.start` behind it. When everything is settled there is no wait, so a normal turn start is unchanged. Live calls of a turn being replaced are not waited on; the replaced start still rejects them. - `packages/paperclip-runner/src/control-plane/durable-prp-control-plane.ts`: `recoverPendingSemanticInputs()` passes are serialized. A call made while the startup pass is still answering a held call waits for that pass, then runs its own, so the turn-start gate cannot finish early by skipping a call that is already being recovered. ## Verification Red/green: - `native-session-executor.test.ts` "answers a local run's held Paperclip tool calls after a restart (restart chaos t101)". On master `recoverSemanticToolInput` is `undefined` for a local run; with this PR it is wired. - `runnerd-codex-transport.test.ts` "answers a held call before starting the next turn (restart chaos t101)", against real runnerd and fake Codex, with a slow startup recovery pass already in flight when `turn/start` arrives. On master `turn/start` never ran recovery, and without the serialization `turn.start` is queued before the held call's result. With this PR the held call is recovered once and its result is queued before `turn.start`. Regression and static checks: - `runnerd-codex-transport.test.ts`, `durable-prp-control-plane.test.ts`, `runnerd-codex-transport-adoption.test.ts`: 510 passed. - `native-session-executor.test.ts` and `native-session-resume.test.ts`: 1368 passed, 1 failed. The failing case, "archives a damaged prior epoch … with real runnerd", fails identically on master on this Mac (`ENOENT … authority-epochs`), so CI is its reference. - `tsc --noEmit` passes for `packages/paperclip-runner` and `server`. ## Risks - Local runs now recover held calls after a reattach, as remote runs already did. Reads re-run under current authority. A mutation without a saved receipt still returns no result and stays held, as before. - `turn.start` may now wait up to its existing deadline while a recovery pass runs, then fails clearly if it has not finished. It never waits when nothing is unsettled, so normal turns get no added latency before `turn.start`. - No schema change and no change to persisted run state formats. ## Model Used - Claude Opus 5.5 (`claude-opus-5-5`), Anthropic, via Claude Code with tool use (shell, file edits). ## 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 - [ ] 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>