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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The heartbeat runner executes legacy agent runs. A controller lease watchdog keeps durable ownership of each legacy run. > - When the watchdog loses the lease, it aborts the adapter. The abort reason was a plain `Error`, and nothing recorded why the run stopped. > - Completion then saved the cancellation as source `unknown`. Sentry got an unexpected cancel that it could not tell apart from other unrecorded stops. > - We saw this on a sandboxed Grok run. The system cancelled it after about 22 minutes with `cancellationSource: unknown`. Workspace copy-back then failed. Every `cancelRun` path records a stop request, so an unrecorded stop this late points to the lease watchdog. > - This pull request records a lease loss as its own cancellation source, with a closed cause label. > - The benefit is that the next event shows whether the lease loss caused the stop, and which renewal failure caused it. That is the missing fact to fix the root cause. ## Linked Issues or Issue Description Refs #15790 Refs #15920 **What happened?** A legacy sandbox run was stopped by the system while it was working. The run record and the Sentry diagnostics show `cancellationSource: unknown`, with no initiator. The controller lease watchdog aborts the adapter with a plain `Error("Legacy controller lease lost")`. Completion does not read the abort reason, so it records the stop as `unknown`. **Expected behavior** When the host stops its own adapter because it lost the controller lease, the run records that cause. Diagnostics name the cause with a closed label. A stop that a user or the control plane requested earlier keeps its recorded source. **Steps to reproduce** 1. Start a legacy run that has a controller lease. 2. Make lease renewal fail: the renewal query errors, the update matches no row, or the lease deadline passes. 3. Let the adapter return its cancelled result. 4. Read `resultJson.cancellation` on the run. Before this change, `source` is `unknown`. **Agent adapter(s) involved** Not adapter-specific (core bug). We saw it with `grok_local` in a sandbox. **Additional context** This change adds diagnostics. It does not prevent the lease loss. #15920 retries a transient copy-back failure. It does not help here, because the stopped sandbox rejects every retry. ## What Changed - `legacy-controller-lease.ts`: The watchdog aborts with a new `LegacyControllerLeaseLostError`. The error carries a closed cause: `renewal_rejected`, `renewal_deadline`, or `renewal_error`. - `run-cancellation.ts`: Add the `controller_lease` cancellation source. Add `controllerLeaseLossCancellation()` and `readControllerLeaseLossCause()`. The reader accepts only the server-written reason text. - `heartbeat/run-completion.ts`: When the outcome is `cancelled` and the abort reason is a lease loss, record a `controller_lease` cancellation (`expected: false`). This covers both an adapter that returns a cancelled result (`completeRun`) and one that throws after the abort, for example through `signal.throwIfAborted()` (`failRun`). A stop request recorded earlier still takes precedence. - `run-failure-diagnostics.ts`: Add `controllerLeaseLossCause` to the execution diagnostics. Only the closed label goes to Sentry, never the reason text. - `heartbeat/run-state.ts`: preserve `controller_lease` in the bounded SQL projection when saved results exceed 64 KB. A database regression verifies the default run-detail read. - `canContinueCancelledRun` stays unchanged. It does not accept `controller_lease`, so a lease loss does not authorize automatic continuation. - `doc/run-log-events.md`: Document the new source and cause labels. - Tests: unit tests for the cause on each watchdog path, completion tests that record the source when the adapter returns and when it throws the abort reason (both fail without the change), tests that a recorded stop request takes precedence, and a test that the Sentry report contains the closed label and not the reason text. ## Verification - `cd server && npx vitest run src/services/run-cancellation.test.ts src/services/legacy-controller-lease.test.ts src/services/__tests__/run-failure-report.test.ts src/services/heartbeat/run-completion.test.ts`: 238 passed, including the embedded Postgres suites. - I reverted only `run-completion.ts` and ran the new completion test. It failed with `source: "unknown"`. With the change, it records `controller_lease`. - I removed only the `failRun` attribution and ran the new thrown-error test. It failed without the `controller_lease` record, and passes with it. - Final full repository `pnpm -r typecheck` and `pnpm build` pass. - Final local regression verification: all 247 tests pass across run-state, cancellation, watchdog, failure reporting, and completion suites. The large-result test fails before the SQL allowlist change. All latest-head CI checks pass (54 successes and two intentional skips). Fresh Apex is 5/5 on `708856c568d07d7b446a4a4af2edc6d9eec7d155` with no unresolved findings. ## Risks - Low risk. The change adds a new source value to server-owned JSON. Old rows keep their values. The readers accept the new value, and no UI code switches on this field. - A lease-loss cancel stays `expected: false`, so it is still reported as unexpected, as before. Now it has a more specific source. - The Sentry payload gets one new closed label (`controllerLeaseLossCause`). It does not include reason text or IDs. > 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 - Anthropic Claude Opus 5.5 (`claude-opus-5-5`) in Claude Code, with tool use (shell, file edits, test runs). OpenAI GPT-6 (`gpt-6`) through Codex added the large-result regression and SQL projection fix, with shell, file-edit, and test tools. The exact context-window size is not exposed in this session. ## 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: devinfoley <139239+devinfoley@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Paperclip <noreply@paperclip.ing>