Distillation

Date: Sep 14, 2026

• 🔴 (23:23) User supplied the exact conditional type decision export type Output<Item> = [Item] extends [never] ? never : Item extends Node<infer A, unknown, any> ? A : never, including the required branch phrasing "never : Item extends Node<infer A,".
• 🔴 (23:23) User supplied the exact conditional type decision export type Error<Item> = [Item] extends [never] ? never : Item extends Node<unknown, infer E, any> ? E : never, including the required branch phrasing "never : Item extends Node<unknown,".
• 🟡 (23:23) packages/core/src/session/run-coordinator.ts exports SessionRunCoordinator; its Coordinator<Key, E> serializes execution per key while allowing different keys concurrently and exposes active, run(key), wake(key), and interrupt(key). Internal Entry<E> contains done: Deferred.Deferred<void, E>, optional owner?: Fiber.Fiber<void, never>, pendingWake: boolean, and stopping: boolean; make() accepts drain: (key: Key, force: boolean) => Effect.Effect<void, E>.
• 🟡 (23:23) A repository-inspection shell command failed before running because Bash reported /usr/bin/bash: -c: line 1: syntax error near unexpected token ')'; the command attempted git grep against commit dc661f30cb2055ad6248fdc59b14998d834497be for core imports from server paths, SessionPrompt, legacy recovery paths, and event replay/ownership references.
• 🟡 (23:23) Repository search at commit dc661f30cb2055ad6248fdc59b14998d834497be found a SessionPrompt monolith reference in packages/core/src/session/runner/llm.ts:49; ownerID = crypto.randomUUID() in packages/core/src/session/execution/local.ts:18; claim filtering by SessionExecutionTable.session_id and SessionExecutionTable.owner_id at line 22; owner_id: ownerID at line 32; and owner_id: text().notNull() plus index session_execution_owner_idx in packages/core/src/session/sql.ts:201,208.
• 🟡 (23:24) Added packages/core/test/session-execution-local.test.ts with in-memory database setup testEffect(Database.layerFromPath(":memory:")), fixed session ID SessionSchema.ID.make("ses_execution_local"), global project worktree /project, and helper queries against SessionExecutionTable.
• 🟡 (23:24) packages/core/test/session-execution-local.test.ts adds exactly 3 lifecycle tests for SessionExecutionLocal: 1. "clears the claim after a successful drain"—resume(sessionID) with run: () => Effect.void leaves no claims; 2. "preserves the claim when its scope closes"—a nonterminating run started by wake(sessionID) retains its single claim after Scope.close(child, Exit.void); 3. "clears the claim after explicit interruption"—interrupt(sessionID) removes the claim after a nonterminating run starts.
• 🟡 (23:24) packages/core/test/session-projector.test.ts expanded from 107 to 321 lines and now imports SessionExecutionTable; added recovery/projector coverage publishes recovery-related events, checks a recovered assistant failure with { type: "unknown", message: "Provider Step outcome unknown after server restart" }, verifies execution claims are cleared in applicable recovery flow, and checks SessionRecoveryTable state.
• 🔴 (23:24) User specified the recovery invariant exactly as the test title: "never recovers an execution superseded by a newer assistant".
• 🟡 (23:24) The superseded-execution recovery test in packages/core/test/session-projector.test.ts creates an execution claim with owner_id: "dead" and verifies that a newer assistant prevents recovery of the older execution.
• 🟡 (23:24) Updated packages/core/test/session-runner-tool-events.test.ts so createLLMEventPublisher(...) receives startCommit: () => Effect.void and terminalCommit: () => Effect.void; existing event-service test double methods include publish, subscribe, all, durable, listen, project, replay, replayAll, remove, and claim.
• 🟡 (23:24) packages/core/test/session-runner-tool-events.test.ts retains 4 tool-event behaviors in order: 1. local tool success serializes media base64 exactly once, omits result, and reconstructs text/file data from structured content; 2. provider-executed success retains compatibility result; 3. a binary error "Cannot read binary file" emits session.next.tool.failed.1 and no session.next.tool.success.1; 4. legacy success-event data containing result still decodes through SessionEvent.Tool.Success.data.
• 🟡 (23:24) The tool-event fixture uses session ID ses_tool_event_test, tool call ID call-image, tool name read, path/name pixel.png, MIME type image/png, base64 payload iVBORw0KGgoAAAANSUhEUgAAAAEAAAAB, agent build, model ID model, and provider ID provider.