Distillation

Date: Sep 17, 2026

• 🟡 (08:49) packages/core/test/session-execution-local.test.ts was updated with the concurrent-interruption regression.
• 🟡 (08:49) Assistant added a terminal-failure crash regression to packages/core/test/session-projector.test.ts using the sequence Step.Started → unresolved local tool → Step.Failed → expired unknown claim. Required behavior: preserve the provider error, fail only the unresolved tool, clear the claim, emit no Step.Recovered, and create no continuation.
• 🟡 (08:49) Snapshot-lineage investigation found v20 still referenced an intermediate ID absent from the frozen tree. Because the work remains one unpublished squashed migration, packages/core/schema.json was changed so prevIds points to immutable base snapshot ID f14a9b18-8207-487e-a3d3-227e629ba9ad; migration validation was expected to show no schema delta.
• 🟡 (08:49) Assistant stated fixes/regressions were in place for three blockers: terminal-failure recovery, concurrent interruption, and cancellation recovery; planned validation included compilation plus focused terminal-failure, concurrent-interrupt, cancellation-recovery, and migration gates.
• 🟡 (08:49) First tsgo --noEmit failed. Key causes: the interruption finalizer in src/session/execution/local.ts:225-226 was outside the scope of interruptions, sessionID, and interruption; Effect v4 lacked Fiber.poll; matchers lacked toBeNone; src/session/recovery.ts accessed SessionMessageData.content without assistant-message narrowing, inferred part as implicit any, and accessed time.completed on a union member without that property; new tests also leaked unknown requirements.
• 🟡 (08:49) Debugging conclusion: the first compile failures were mechanical rather than design failures. Planned fixes were to move the local interruption finalizer into scope, replace unsupported Fiber.poll/toBeNone checks with explicit Deferred completion signals, and explicitly narrow/decode the terminal assistant message.
• 🟡 (08:50) packages/core/src/session/execution/local.ts, packages/core/src/session/recovery.ts, packages/core/test/session-run-coordinator.test.ts, and packages/core/test/session-execution-local.test.ts were updated.
• 🟡 (08:50) In packages/core/src/session/execution/local.ts, concurrent interrupts now consult interruptions.get(sessionID) and join an existing Deferred; a new interruption sets the claim to phase: "cancelling", races coordinator interruption/cleanup against lease renewal, and uses Effect.onExit inside the scoped interrupt effect to delete the matching map entry and complete the shared Deferred via Deferred.doneUnsafe(interruption, exit).
• 🟡 (08:51) A second tsgo --noEmit exposed remaining mechanical errors: src/session/recovery.ts still accessed .content without adequate narrowing, had an implicit-any part, and assigned number where Utc was required; firstDone and secondDone were referenced but undeclared in both concurrent-interruption tests.
• 🟡 (08:51) Regression "joins concurrent interruption through durable cleanup" in packages/core/test/session-execution-local.test.ts:280-314 starts a never-ending run, blocks its finalizer with releaseFinalizer, launches two execution.interrupt(sessionID) fibers, requires both completion signals to remain unfinished while the claim is phase: "cancelling", then releases cleanup, joins both callers, and expects all claims removed.
• 🟡 (08:51) Regression "joins concurrent interruption behind one cleanup barrier" in packages/core/test/session-run-coordinator.test.ts:368+ starts two concurrent coordinator.interrupt("session", ...) calls while cleanup is gated, queues coordinator.wake("session"), and verifies before release that cleanups === 1, both interrupt callers remain pending, and runs === 1; after releasing cleanupGate, both callers join and the queued successor starts.
• 🟡 (08:52) Recovery decoding was revised to use the schema for SessionMessage.Message; tests were revised to use Deferred.isDone completion markers instead of unavailable Fiber.poll.
• 🟡 (08:52) A subsequent compile found Schema.decodeUnknown unavailable in Effect 4.0.0-beta.83 and indicated Schema.decodeUnknownEffect as the appropriate effectful API; it also found unresolved unknown typing for tool parts, a missing dependency in the recovery.ts node declaration, many downstream test environment errors caused by that dependency issue, and duplicate declarations of firstDone/secondDone in packages/core/test/session-run-coordinator.test.ts:254-257.
• 🟡 (08:53) Effect source inspection confirmed Schema.decodeUnknownEffect exists in effect-smol/packages/effect/src/Schema.ts, while decodeUnknownExit and decodeUnknownOption are alternatives for exit/optional decoding.
• 🟡 (08:53) src/session/recovery.ts was changed from nonexistent Schema.decodeUnknown to Schema.decodeUnknownEffect; duplicate firstDone/secondDone declarations were removed from the earlier coordinator test.
• 🟡 (08:53) The next compile narrowed remaining issues to unsafe .provider access on a union of text/reasoning/tool parts in src/session/recovery.ts:203-204, plus still-missing firstDone/secondDone declarations in the new coordinator regression at lines 398, 402, 407, and 408.
• 🟡 (08:54) packages/core/src/session/recovery.ts was updated to narrow tool parts before reading provider, and packages/core/test/session-run-coordinator.test.ts was updated to declare the new regression’s firstDone and secondDone completion signals.
• 🟡 (08:55) tsgo --noEmit completed successfully with no diagnostics.
• 🟡 (08:55) Focused test gate 1 passed: 3 tests passed, 55 filtered out, 0 failed, and 13 expect() calls across 1 file in 1.81s.
• 🟡 (08:55) Focused test gate 2 passed: 1 test passed, 17 filtered out, 0 failed, and 6 expect() calls across 1 file in 256.00ms.
• 🟡 (08:55) Focused test gate 3 passed: 1 test passed, 12 filtered out, 0 failed, and 4 expect() calls across 1 file in 629.00ms.
• 🟡 (08:55) Migration consistency passed with corrected base ancestry: incremental config /tmp/opencode-core-migration-check-xXi6Ku/incremental.config.ts reported No schema changes, nothing to migrate 😴; full config /tmp/opencode-core-migration-check-xXi6Ku/full.config.ts generated /tmp/opencode-core-migration-check-xXi6Ku/full/20260917085511_schema/migration.sql.
• 🟡 (08:55) Assistant concluded all three focused blocker gates and migration consistency passed, then began the complete recovery suite to jointly exercise multi-tool replay, coordinator failure propagation, interruption cleanup, and prior wake/recovery races.