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DottaandClaude Opus 5.5
8eb11fa8aa
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - A Runner streams numbered events to the control plane, which commits each one and acknowledges the committed prefix > - In restart chaos wave `w-20261109T093417-s9807`, t01 (claude R1, local), the control plane never committed Runner seq 34. Every failure path in `#event` closed the connection without recording why. The Runner reconnected 2,848 times over 14 minutes and nothing detected it > - This pull request makes that loop a detected, named failure that carries its cause > - The benefit is that a wedged event stream becomes a visible run failure with a reason, instead of a silent "running" task ## Linked Issues or Issue Description Refs #19831. Restart chaos wave `w-20261109T093417-s9807` (master `df4562ab38`), task t01, run `d08dc899`. **What happened** (Phase 2's re-check of the kept instance): - The provider kept working. Claude's transcript runs to 09:47:03 and ends in `paperclip_finish`. - The Runner, its ACPX provider state, and the controller journal agree on acked seq 33. The controller never commits Runner seq 34 (Write progressed, 09:36:25.892). - Phase 2 replayed the kept outbox offline. Runner seq 34 fails `validatePrpEvent`: its `/payload/target` contains a newline from a malformed Claude Write call. `#event` closes without a reason, and the Runner redelivers the same bytes forever. (Phase 2's separate PR stops the producers from emitting such paths.) - Every `#event` failure path closed the connection without recording a reason, so the cause was invisible. An outbox that already holds such an event can only be cleared by failing closed. - The `<instance>:<run>:N` ids in `heartbeat_run_events` come from the TS driver's own projection numbering, so there was no Runner sequence rewind. ## What Changed - `packages/paperclip-runner/src/control-plane/durable-prp-control-plane.ts`: - `#eventCommitFailed` replaces the bare `connection.close()` on each `#event` commit-failure path. It records a bounded cause: `event_sequence_mismatch` for an out-of-order event, `event_schema_invalid:<issue paths>` for an event that fails `validatePrpEvent`, the error's code or name (never its message) for a commit callback error, `journal_sequence_not_contiguous`, `journal_commit_refused`, or `checkpoint_flush_failed:<cause>`. - If failures continue for the same run at the same acknowledged cursor for at least 20 attempts and 45 s, it fails closed with `NativeSessionProtocolIntegrityError("runner_event_commit_stalled", "<cause> at source seq N")`, where N is the failing event's own sequence. Only a moved acknowledged cursor counts as progress (a replayed, already acknowledged duplicate does not), and a different run starts a fresh counter. A single transient failure still just reconnects, as before. - A checkpoint flush that fails before any outbound frame also counts, as `checkpoint_flush_failed:<cause>`. That includes the authentication challenge and the welcome, so a reconnect that cannot even authenticate still reaches the bound. - A journal write that throws (`#store.commit`, `#store.commitEvent`, or the welcome save) leaves the store unwritable until reload, so it fails closed at once with `journal_write_failed:<code>`. - `packages/paperclip-runner/src/contracts/native-session-backend.ts`: new reason `runner_event_commit_stalled`, with an optional `detail` in the message. ## Verification Red/green: - "bounds commit-stall reconnects for an out-of-order event": a schema-valid event with the wrong `sourceSeq` fails closed with `event_sequence_mismatch at source seq 5`. Before this it closed silently forever. "… for 20 failures inside 45 s" pins the time bound: 20 failures over 19 s do not fail closed. - "fails closed when checkpoint storage keeps failing before a reconnect authenticates": with checkpoint persistence refusing (`ECONNREFUSED`), 20 reconnect attempts fail before authentication, then the control plane fails closed with `checkpoint_flush_failed:ECONNREFUSED at source seq 1`. Without this, those attempts close silently. - "fails closed at once when the journal cannot record a runner event": a journal write throwing `ENOSPC` fails closed with `journal_write_failed:ENOSPC at source seq 1`, and the private error text is not carried. On master the connection only closes. - `durable-prp-control-plane.test.ts` "fails closed with the schema issue when the runner keeps redelivering an invalid event (restart chaos t01)": an event that fails `validatePrpEvent` is redelivered 20 times over 57 s of mocked clock. On master the control plane only closes; with this PR it fails closed with `runner_event_commit_stalled` and detail `event_schema_invalid:/… at source seq 1`. - `durable-prp-control-plane.test.ts` "fails closed when runner events keep failing to commit without progress": 20 reconnects over 57 s of mocked clock, each commit failing with `ECONNRESET`. On master nothing fails closed. With this PR the 20th failure reports `runner_event_commit_stalled` with detail `ECONNRESET at source seq 1`, and the private error message is not carried. File: 201 passed, including the existing "keeps a non-typed commit failure retryable" cases. Static checks: - `tsc --noEmit` passes for `packages/paperclip-runner` and `server`. The server is unchanged. ## Risks - Storage that keeps failing event commits for at least 45 s and 20 attempts now fails the run (operator recovery) instead of looping silently. Shorter outages are unchanged. - The recorded cause is a code or error name only, never error text, so no tool content or credentials reach the run error. - No schema change and no change to persisted 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>