Distillation

Date: Sep 17, 2026

• 🟡 (00:47) Separate runner-cause diagnostics identified InterruptError: All fibers interrupted without error at V2Session.interrupt in packages/core/test/session-runner.test.ts:4030:42, originating from packages/core/src/session.ts:432:25; the coordinator still surfaced Error: Interrupted Session settlement failed: ses_runner_test.
• 🟡 (00:47) The diagnostic run retained execution claim 4199a566-a45a-46c3-88b9-b2397d638d22 for ses_runner_test, owned by 887b1aeb-40d6-4846-87c6-901e687fa471, with assistant_message_id: "msg_0acd4bda6001GX5gdPPllWd6nS", phase: "cancelling", assistant_seq: 3, time_created: 0, expires_at: 30000, and recovery_error: null.
• 🟡 (00:47) Root cause identified: during interruption, providerStream’s unconditional ensuring(flush) executes before the settlement body gains control and faults on the pre-commit fragment, preventing the uninterruptible cancellation handler from reconciling the fragment, adopting the durable assistant ID, and publishing session.next.step.interrupted.1.
• 🟡 (00:47) Fix applied in packages/core/src/session/runner/llm.ts: stream cleanup now skips the generic flush only for interrupted exits, allowing the uninterruptible cancellation handler to own fragment reconciliation and adopt the durable assistant ID; typed failures and normal EOF continue to flush normally.
• 🟡 (00:47) Diagnostic instrumentation/associated test changes were updated in packages/core/test/session-runner.test.ts; tool reported successful modifications to both packages/core/src/session/runner/llm.ts and packages/core/test/session-runner.test.ts. No post-fix test result was reported yet.