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Date: Sep 17, 2026
packages/core/src/session/run-coordinator.ts defines SessionRunCoordinator.Coordinator<Key, E> to serialize execution per key while allowing different keys to run concurrently. Its API is active, run(key), wake(key), and interrupt(key, cleanup?); drain(key, force) supplies the underlying execution.packages/core/src/session/run-coordinator.ts tracks each active key with Entry<E> fields done, optional owner, optional exit, pendingWake, and stopping; entries are held in Map<Key, Entry<E>>, while fibers are managed by FiberSet.makeRuntime<never, void, never>().SessionRunCoordinator.start() gates ordinary starts through a Deferred, yields before successor execution, invokes options.drain(key, force), and calls settle(key, entry, exit) via Effect.onExit.SessionRunCoordinator.settle() coalesces a successful run with pendingWake into a successor run using force=false; otherwise it either deletes the active key or installs a successor entry, then completes the prior entry’s done deferred.SessionRunCoordinator.run() uses Effect.uninterruptibleMask; it joins an existing active run, waits and retries if the existing entry is stopping, or creates a new entry and starts drain(key, true).SessionRunCoordinator.wake() sets pendingWake=true for an active entry; when idle, it creates an entry and starts drain(key, false).SessionRunCoordinator.interrupt() marks the entry stopping, clears the preexisting pending wake, interrupts the owner fiber, executes optional cleanup, verifies that interrupted execution settled, and then either deletes the entry or starts a newly requested successor. Missing settlement throws "Interrupted Session execution did not settle", and cleanup failure is propagated with Effect.failCause.packages/core/src/session/runner/index.ts defines SessionRunner.RunError as LLMError | SessionRunnerModel.Error | MessageDecodeError | ContextSnapshotDecodeError | SystemContext.InitializationBlocked | ToolOutputStore.Error.SessionRunner.Interface.run() runs one local continuation from recorded session history and accepts sessionID, force, executionID, ownerID, and optional recoveryInputID; explicit runs perform one provider attempt even if no durable work is eligible.packages/core/src/session/recovery-id.ts deterministically creates recovery IDs: message(executionID, assistantMessageID?) returns the supplied assistant ID or msg_recovery_${executionID}, while continuation(executionID) returns msg_recovery_continue_${executionID}.admission.shouldWake is true, by calling execution.wake(admission.admitted.sessionID).packages/server/src/routes.ts groups application services including Database.node, EventV2.node, httpClient, ToolOutputStore.cleanupNode, SessionV2.node, SessionRecovery.node, PermissionSaved.node, PtyTicket.node, Credential.node, PtyEnvironment.node, and LocationServiceMap.node.packages/server/src/routes.ts builds the service graph with AppNodeBuilder.build(applicationServices, [[SessionExecution.node, SessionExecutionLocal.node]]), exposing OpenAPI at /openapi.json; route layers provide handlers, session/location middleware, authorization, schema errors, authentication, and the service layer.packages/server/src/routes.ts has createRoutes(password?), which configures username "opencode" and an optional password, and createEmbeddedRoutes(), which configures username "opencode" with no password. webHandler() uses HttpRouter.toWebHandler with disableLogger: true.packages/opencode/src/server/routes/instance/httpapi/server.ts merges routes in this order: rootApiRoutes, eventApiRoutes, ptyConnectApiRoutes, instanceRoutes, serverRoutes, docRoute, and uiRoute.packages/opencode/src/server/routes/instance/httpapi/server.ts provides errorLayer, compressionLayer, corsVaryFix, fenceLayer, CORS, MoveSession.node, HttpServer.layerServices, CorsConfig, session/location layers, PtyEnvironment.layer, and a graph containing SessionV2.node and SessionRecovery.node; overrides map LocationServiceMap.node to locationServiceMapV2 and SessionExecution.node to SessionExecutionLocal.node.Observability.layer must remain the final Layer.provideMerge in packages/opencode/src/server/routes/instance/httpapi/server.ts, because layers provided later build beneath earlier ones; otherwise eagerly forked fibers such as the ModelsDev background refresh capture Effect’s default stdout logger and corrupt the TUI, tracked as #34730.packages/opencode/src/server/routes/instance/httpapi/server.ts exports routes = createRoutes() and lazily constructs webHandler with disableLogger: true, memoMap, and disposeMiddleware.