{"version":3,"file":"manager.cjs","names":["toMessageDict","SubagentManager","StreamError","isSubagentNamespace","extractToolCallIdFromNamespace"],"sources":["../../src/ui/manager.ts"],"sourcesContent":["import type { BaseMessage } from \"@langchain/core/messages\";\n\nimport { DEFAULT_MESSAGES_KEY } from \"../stream/constants.js\";\nimport type {\n  CheckpointsStreamEvent,\n  CustomStreamEvent,\n  DebugStreamEvent,\n  ErrorStreamEvent,\n  EventsStreamEvent,\n  FeedbackStreamEvent,\n  MessagesTupleStreamEvent,\n  MetadataStreamEvent,\n  TasksStreamEvent,\n  ToolsStreamEvent,\n  UpdatesStreamEvent,\n  ValuesStreamEvent,\n} from \"../types.stream.js\";\nimport { MessageTupleManager, toMessageDict } from \"./messages.js\";\nimport { StreamError } from \"./errors.js\";\nimport type { Message } from \"../types.messages.js\";\nimport type { BagTemplate } from \"../types.template.js\";\nimport {\n  SubagentManager,\n  extractToolCallIdFromNamespace,\n  isSubagentNamespace,\n} from \"./subagents.js\";\nimport type { SubagentStreamInterface } from \"./types.js\";\n\n/**\n * Special ID used by LangGraph's messagesStateReducer to signal\n * that all messages should be removed from the state.\n */\nexport const REMOVE_ALL_MESSAGES = \"__remove_all__\";\n\ntype GetUpdateType<\n  Bag extends BagTemplate,\n  StateType extends Record<string, unknown>,\n> = Bag extends { UpdateType: unknown }\n  ? Bag[\"UpdateType\"]\n  : Partial<StateType>;\n\ntype GetCustomEventType<Bag extends BagTemplate> = Bag extends {\n  CustomEventType: unknown;\n}\n  ? Bag[\"CustomEventType\"]\n  : unknown;\n\ntype EventStreamMap<StateType, UpdateType, CustomType> = {\n  values: ValuesStreamEvent<StateType>;\n  updates: UpdatesStreamEvent<UpdateType>;\n  custom: CustomStreamEvent<CustomType>;\n  debug: DebugStreamEvent;\n  messages: MessagesTupleStreamEvent;\n  events: EventsStreamEvent;\n  metadata: MetadataStreamEvent;\n  checkpoints: CheckpointsStreamEvent<StateType>;\n  tasks: TasksStreamEvent<StateType, UpdateType>;\n  error: ErrorStreamEvent;\n  feedback: FeedbackStreamEvent;\n  tools: ToolsStreamEvent;\n};\n\nexport type EventStreamEvent<StateType, UpdateType, CustomType> =\n  EventStreamMap<StateType, UpdateType, CustomType>[keyof EventStreamMap<\n    StateType,\n    UpdateType,\n    CustomType\n  >];\n\ninterface StreamManagerEventCallbacks<\n  StateType extends Record<string, unknown>,\n  Bag extends BagTemplate = BagTemplate,\n> {\n  onUpdateEvent?: (\n    data: UpdatesStreamEvent<GetUpdateType<Bag, StateType>>[\"data\"],\n    options: {\n      namespace: string[] | undefined;\n      mutate: (\n        update: Partial<StateType> | ((prev: StateType) => Partial<StateType>)\n      ) => void;\n    }\n  ) => void;\n  onCustomEvent?: (\n    data: GetCustomEventType<Bag>,\n    options: {\n      namespace: string[] | undefined;\n      mutate: (\n        update: Partial<StateType> | ((prev: StateType) => Partial<StateType>)\n      ) => void;\n    }\n  ) => void;\n  onMetadataEvent?: (data: MetadataStreamEvent[\"data\"]) => void;\n  onLangChainEvent?: (data: EventsStreamEvent[\"data\"]) => void;\n  onDebugEvent?: (\n    data: DebugStreamEvent[\"data\"],\n    options: { namespace: string[] | undefined }\n  ) => void;\n  onCheckpointEvent?: (\n    data: CheckpointsStreamEvent<StateType>[\"data\"],\n    options: { namespace: string[] | undefined }\n  ) => void;\n  onTaskEvent?: (\n    data: TasksStreamEvent<StateType, GetUpdateType<Bag, StateType>>[\"data\"],\n    options: { namespace: string[] | undefined }\n  ) => void;\n  onToolEvent?: (\n    data: ToolsStreamEvent[\"data\"],\n    options: {\n      namespace: string[] | undefined;\n      mutate: (\n        update: Partial<StateType> | ((prev: StateType) => Partial<StateType>)\n      ) => void;\n    }\n  ) => void;\n}\n\n/**\n * Options for StreamManager constructor.\n */\nexport interface StreamManagerOptions {\n  /**\n   * Throttle the stream updates.\n   * If a number is provided, updates are throttled to the given milliseconds.\n   * If `true`, updates are batched in a single macrotask.\n   * If `false`, updates are not throttled.\n   */\n  throttle: number | boolean;\n\n  /**\n   * Tool names that indicate subagent invocation.\n   *\n   * When an AI message contains tool calls with these names, they are\n   * automatically tracked as subagent executions. This enables the\n   * `subagents`, `activeSubagents`, `getSubagent()`, and `getSubagentsByType()`\n   * properties on the stream.\n   *\n   * @default [\"task\"]\n   *\n   * @example\n   * ```typescript\n   * // Track both \"task\" and \"delegate\" as subagent tools\n   * subagentToolNames: [\"task\", \"delegate\", \"spawn_agent\"]\n   * ```\n   */\n  subagentToolNames?: string[];\n\n  /**\n   * Filter out messages from subagent streams in the main messages array.\n   *\n   * When enabled, messages from subagraph executions (those with a `tools:` namespace)\n   * are excluded from `stream.messages`. Instead, these messages are tracked\n   * per-subagent and accessible via `stream.subagents.get(id).messages`.\n   *\n   * This is useful for deep agent architectures where you want to display\n   * the main conversation separately from subagent activity.\n   *\n   * @default false\n   *\n   * @example\n   * ```typescript\n   * const stream = useStream({\n   *   assistantId: \"my-agent\",\n   *   filterSubagentMessages: true,\n   * });\n   *\n   * // Main thread messages only (no subagent messages)\n   * stream.messages\n   *\n   * // Access subagent messages individually\n   * stream.subagents.get(\"call_xyz\").messages\n   * ```\n   */\n  filterSubagentMessages?: boolean;\n\n  /**\n   * Converts a @langchain/core BaseMessage to the desired output format.\n   *\n   * Defaults to `toMessageDict` which produces plain Message objects.\n   * Framework SDKs pass `toMessageClass` (identity) to keep class instances.\n   */\n  toMessage?: (chunk: BaseMessage) => Message | BaseMessage;\n}\n\nexport class StreamManager<\n  StateType extends Record<string, unknown>,\n  Bag extends BagTemplate = BagTemplate,\n> {\n  private abortRef = new AbortController();\n\n  private messages: MessageTupleManager;\n\n  private subagentManager: SubagentManager;\n\n  private listeners = new Set<() => void>();\n\n  private throttle: number | boolean;\n\n  private filterSubagentMessages: boolean;\n\n  private toMessage: (chunk: BaseMessage) => Message | BaseMessage;\n\n  private queue: Promise<unknown> = Promise.resolve();\n\n  private queueSize: number = 0;\n\n  private state: {\n    isLoading: boolean;\n    values: [values: StateType, kind: \"stream\" | \"stop\"] | null;\n    error: unknown;\n    /** Version counter to force React re-renders on subagent changes */\n    version: number;\n  };\n\n  constructor(messages: MessageTupleManager, options: StreamManagerOptions) {\n    this.messages = messages;\n    this.state = {\n      isLoading: false,\n      values: null,\n      error: undefined,\n      version: 0,\n    };\n    this.throttle = options.throttle;\n    this.filterSubagentMessages = options.filterSubagentMessages ?? false;\n    this.toMessage = options.toMessage ?? toMessageDict;\n    this.subagentManager = new SubagentManager({\n      subagentToolNames: options.subagentToolNames,\n      onSubagentChange: () => this.bumpVersion(),\n      toMessage: this.toMessage,\n    });\n  }\n\n  /**\n   * Increment version counter to trigger React re-renders.\n   * Called when subagent state changes.\n   */\n  private bumpVersion = () => {\n    this.state = { ...this.state, version: this.state.version + 1 };\n    this.notifyListeners();\n  };\n\n  /**\n   * Get all subagents as a Map.\n   */\n  getSubagents(): Map<string, SubagentStreamInterface> {\n    return this.subagentManager.getSubagents();\n  }\n\n  /**\n   * Get all currently running subagents.\n   */\n  getActiveSubagents(): SubagentStreamInterface[] {\n    return this.subagentManager.getActiveSubagents();\n  }\n\n  /**\n   * Get a specific subagent by tool call ID.\n   */\n  getSubagent(toolCallId: string): SubagentStreamInterface | undefined {\n    return this.subagentManager.getSubagent(toolCallId);\n  }\n\n  /**\n   * Get all subagents of a specific type.\n   */\n  getSubagentsByType(type: string): SubagentStreamInterface[] {\n    return this.subagentManager.getSubagentsByType(type);\n  }\n\n  /**\n   * Get all subagents triggered by a specific AI message.\n   */\n  getSubagentsByMessage(messageId: string): SubagentStreamInterface[] {\n    return this.subagentManager.getSubagentsByMessage(messageId);\n  }\n\n  /**\n   * Reconstruct subagent state from historical messages.\n   *\n   * This method should be called when loading thread history to restore\n   * subagent visualization after:\n   * - Page refresh (when stream has already completed)\n   * - Loading thread history\n   * - Navigating between threads\n   *\n   * @param messages - Array of messages from thread history\n   * @param options - Optional configuration\n   * @param options.skipIfPopulated - If true, skip reconstruction if subagents already exist\n   */\n  reconstructSubagents(\n    messages: Message[],\n    options?: { skipIfPopulated?: boolean }\n  ): void {\n    this.subagentManager.reconstructFromMessages(messages, options);\n  }\n\n  /**\n   * Fetch and restore internal messages for reconstructed subagents from their\n   * subgraph checkpoints. Should be called after `reconstructSubagents` to\n   * restore the full subagent conversation after a page refresh.\n   *\n   * Subagent messages are persisted in the LangGraph checkpointer under a\n   * subgraph-specific `checkpoint_ns` (e.g. `tools:<uuid>`). This method\n   * discovers the correct namespace by inspecting the main thread's intermediate\n   * history checkpoints, where each pending task's `checkpoint.checkpoint_ns`\n   * identifies the subgraph. Tasks are matched to tool calls by their Send index\n   * (`task.path[1]`), which corresponds to the order of tool calls in the AI\n   * message — no deepagent-specific metadata required.\n   *\n   * @param threads - Client with a `getHistory` method (e.g. `client.threads`)\n   * @param threadId - The parent thread ID\n   * @param options - Optional configuration\n   * @param options.messagesKey - Key in state values containing messages (default: \"messages\")\n   * @param options.signal - AbortSignal to cancel in-flight requests on effect cleanup\n   */\n  async fetchSubagentHistory(\n    threads: {\n      getHistory<V extends Record<string, unknown>>(\n        threadId: string,\n        options?: {\n          limit?: number;\n          checkpoint?: { checkpoint_ns?: string };\n          signal?: AbortSignal;\n        }\n      ): Promise<\n        Array<{\n          values: V;\n          tasks?: Array<{\n            id: string;\n            name: string;\n            path?: unknown[];\n            checkpoint?: { checkpoint_ns?: string } | null;\n          }>;\n        }>\n      >;\n    },\n    threadId: string,\n    options?: {\n      messagesKey?: string;\n      historyLimit?: number;\n      signal?: AbortSignal;\n    }\n  ): Promise<void> {\n    const messagesKey = options?.messagesKey ?? DEFAULT_MESSAGES_KEY;\n    const signal = options?.signal;\n\n    /**\n     * Bail immediately if already cancelled (React Strict Mode cleanup)\n     */\n    if (signal?.aborted) {\n      return;\n    }\n\n    /**\n     * Only fetch for subagents that have no messages (reconstructed from history)\n     */\n    const toFetch = [...this.subagentManager.getSubagents().entries()].filter(\n      ([, s]) => s.messages.length === 0\n    );\n\n    /**\n     * Bail immediately if there are no subagents to fetch\n     */\n    if (toFetch.length === 0) {\n      return;\n    }\n\n    /**\n     * Step 1: Discover subgraph namespaces from intermediate history\n     *\n     * When LangGraph dispatches parallel tool calls (v2 mode), each is a\n     * separate Send task with a unique UUID-based checkpoint_ns. The intermediate\n     * history checkpoints record these as `tasks[i]` where:\n     *   - `tasks[i].checkpoint.checkpoint_ns` = \"tools:<uuid>\" for each subgraph\n     *   - `tasks[i].path = [\"__pregel_push\", sendIndex]` matches tool_calls order\n     *\n     * By matching task Send index → tool_call position in the AI message we can\n     * derive the subgraph namespace for every tool call without any external\n     * metadata on the ToolMessage itself.\n     */\n    const toolCallIdToNamespace = new Map<string, string>();\n\n    try {\n      /**\n       * Fetch enough history to include the intermediate checkpoint where\n       * tool-call tasks were pending (typically within the last 10 checkpoints).\n       */\n      const mainHistory = await threads.getHistory<Record<string, unknown>>(\n        threadId,\n        { limit: options?.historyLimit ?? 20, signal }\n      );\n\n      /**\n       * Phase 1: Direct mapping across ALL checkpoints (preferred).\n       *\n       * When a completed checkpoint contains task results, each task.result\n       * has a ToolMessage whose tool_call_id directly and unambiguously maps\n       * the task to the LLM tool call that triggered it. This is more robust\n       * than positional alignment: it works even when a step mixes subagent\n       * tool calls with other tool calls, and requires no assumptions about\n       * the ordering of tasks vs tool_calls.\n       *\n       * We collect these direct mappings across the entire history before\n       * attempting any positional fallback. Otherwise a more recent checkpoint\n       * whose task is still pending (e.g. an interrupted run) could produce a\n       * positional guess and stop the scan before reaching the older checkpoint\n       * that actually holds the correct, completed mapping.\n       *\n       * LangGraph v2 dispatches each parallel tool call as a separate PUSH\n       * task (\"__pregel_push\"). The subgraph checkpoint_ns is constructed as\n       * `task.name + \":\" + task.id`, mirroring algo.ts:\n       *   taskCheckpointNamespace = checkpointNamespace + \":\" + taskId\n       *   where checkpointNamespace = task.name for root-level tasks.\n       *\n       * task.checkpoint is always null for completed tasks, so we derive the\n       * namespace from task.name + task.id rather than task.checkpoint.checkpoint_ns.\n       */\n      for (const checkpoint of mainHistory) {\n        const { tasks } = checkpoint;\n        if (!tasks || tasks.length === 0) {\n          continue;\n        }\n\n        for (const task of tasks) {\n          if (\n            !Array.isArray(task.path) ||\n            task.path[0] !== \"__pregel_push\" ||\n            typeof task.id !== \"string\" ||\n            typeof task.name !== \"string\"\n          ) {\n            continue;\n          }\n\n          /**\n           * Read tool_call_id directly from the task's result ToolMessage.\n           */\n          const resultMessages = (\n            task as unknown as { result?: { messages?: unknown[] } }\n          ).result?.messages;\n\n          if (!Array.isArray(resultMessages)) {\n            continue;\n          }\n\n          for (const msg of resultMessages) {\n            const m = msg as Record<string, unknown>;\n            if (\n              m.type === \"tool\" &&\n              typeof m.tool_call_id === \"string\" &&\n              toFetch.some(([id]) => id === m.tool_call_id) &&\n              !toolCallIdToNamespace.has(m.tool_call_id)\n            ) {\n              toolCallIdToNamespace.set(\n                m.tool_call_id,\n                `${task.name}:${task.id}`\n              );\n            }\n          }\n        }\n      }\n\n      /**\n       * Phase 2: Positional fallback, applied ONLY to tool calls that Phase 1\n       * could not resolve.\n       *\n       * This covers checkpoints whose task results are not yet populated (tasks\n       * still pending — the live or just-interrupted case). We align push tasks\n       * to the subagent tool calls of the triggering AI message by Send index\n       * (task.path[1]). Restricting this to still-unmapped tool calls guarantees\n       * a correct direct mapping from Phase 1 is never overwritten by a guess.\n       */\n      const hasUnmappedToolCalls = () =>\n        toFetch.some(([id]) => !toolCallIdToNamespace.has(id));\n\n      if (hasUnmappedToolCalls()) {\n        for (const checkpoint of mainHistory) {\n          if (!hasUnmappedToolCalls()) break;\n\n          const { tasks } = checkpoint;\n          if (!tasks || tasks.length === 0) {\n            continue;\n          }\n\n          const pushTasks = tasks.filter(\n            (t) =>\n              Array.isArray(t.path) &&\n              t.path[0] === \"__pregel_push\" &&\n              typeof t.path[1] === \"number\" &&\n              // Send tasks are `[PUSH, i]` (legacy JS servers) or\n              // `[PUSH, i, false]` (aligned with Python); longer paths are\n              // error handlers of failed Sends (`[PUSH, i, false,\n              // \"node_error_handler\", false]`) and must not be mistaken for\n              // a second Send at the same index.\n              t.path.length <= 3 &&\n              typeof t.id === \"string\" &&\n              typeof t.name === \"string\"\n          );\n          if (pushTasks.length === 0) continue;\n\n          /**\n           * Find the AI message with subagent tool calls to align by Send index.\n           */\n          const msgs = checkpoint.values[messagesKey];\n          if (!Array.isArray(msgs)) continue;\n\n          let aiMessage: Record<string, unknown> | undefined;\n          for (let i = msgs.length - 1; i >= 0; i -= 1) {\n            const m = msgs[i] as Record<string, unknown>;\n            if (\n              m.type === \"ai\" &&\n              Array.isArray(m.tool_calls) &&\n              m.tool_calls.length > 0 &&\n              (m.tool_calls as Array<{ name: string }>).some((tc) =>\n                this.subagentManager.isSubagentToolCall(tc.name)\n              )\n            ) {\n              aiMessage = m;\n              break;\n            }\n          }\n          if (!aiMessage) {\n            continue;\n          }\n\n          /**\n           * Only consider subagent tool calls from the AI message — not all tool\n           * calls. This ensures regular tool calls (searchWeb, queryDatabase, etc.)\n           * are never mistaken for subagents even when they appear in the same step.\n           */\n          const subagentToolCalls = (\n            aiMessage.tool_calls as Array<{ id?: string; name: string }>\n          ).filter((tc) => this.subagentManager.isSubagentToolCall(tc.name));\n\n          if (subagentToolCalls.length === 0) {\n            continue;\n          }\n\n          /**\n           * Sort push tasks by Send index (path[1]) to align with tool_calls order\n           */\n          const sorted = [...pushTasks].sort((a, b) => {\n            const ai = Array.isArray(a.path) ? (a.path[1] as number) : 0;\n            const bi = Array.isArray(b.path) ? (b.path[1] as number) : 0;\n            return ai - bi;\n          });\n\n          for (\n            let i = 0;\n            i < sorted.length && i < subagentToolCalls.length;\n            i += 1\n          ) {\n            const tc = subagentToolCalls[i];\n            const task = sorted[i];\n            if (\n              tc?.id &&\n              task.id &&\n              task.name &&\n              toFetch.some(([id]) => id === tc.id) &&\n              !toolCallIdToNamespace.has(tc.id)\n            ) {\n              toolCallIdToNamespace.set(tc.id, `${task.name}:${task.id}`);\n            }\n          }\n        }\n      }\n    } catch {\n      /**\n       * Non-fatal: fall back to subagent.namespace below\n       */\n    }\n\n    /**\n     * Step 2: Fetch each subagent's conversation from its subgraph checkpoint\n     */\n    await Promise.all(\n      toFetch.map(async ([toolCallId, subagent]) => {\n        /**\n         * Priority order for the subgraph checkpoint_ns:\n         *   1. Derived from main thread's intermediate task list (preferred, no coupling)\n         *   2. Already on the subagent's namespace (e.g. populated during streaming)\n         *   3. Skip — we cannot reliably identify the namespace\n         */\n        const checkpointNs =\n          toolCallIdToNamespace.get(toolCallId) ??\n          (subagent.namespace.length > 0\n            ? subagent.namespace.join(\"|\")\n            : undefined);\n\n        if (!checkpointNs) return;\n\n        try {\n          const history = await threads.getHistory<Record<string, unknown>>(\n            threadId,\n            {\n              checkpoint: { checkpoint_ns: checkpointNs },\n              limit: 1,\n              signal,\n            }\n          );\n\n          /**\n           * If the HTTP request was cancelled mid-flight the getHistory call\n           * would have thrown an AbortError (caught below). If we reach here the\n           * fetch completed successfully, so always process the result.\n           */\n          const latestState = history[0];\n          if (!latestState?.values) return;\n\n          const messages = latestState.values[messagesKey];\n          if (!Array.isArray(messages) || messages.length === 0) return;\n\n          /**\n           * Normalize messages: promote tool_calls from additional_kwargs to top\n           * level when the checkpointer serialized them in the legacy format.\n           */\n          const normalizedMessages = messages.map((msg) => {\n            const m = msg as Record<string, unknown>;\n            if (\n              m.type === \"ai\" &&\n              (!m.tool_calls || (m.tool_calls as unknown[]).length === 0)\n            ) {\n              const ak = m.additional_kwargs as\n                | Record<string, unknown>\n                | undefined;\n              const legacy = ak?.tool_calls;\n              if (Array.isArray(legacy) && legacy.length > 0) {\n                return { ...m, tool_calls: legacy };\n              }\n            }\n            return m;\n          });\n\n          this.subagentManager.updateSubagentFromSubgraphState(\n            toolCallId,\n            normalizedMessages as Message[],\n            latestState.values\n          );\n        } catch {\n          /**\n           * Ignore AbortError and other transient errors\n           */\n        }\n      })\n    );\n  }\n\n  /**\n   * Check if any subagents are currently tracked.\n   */\n  hasSubagents(): boolean {\n    return this.subagentManager.hasSubagents();\n  }\n\n  private setState = (newState: Partial<typeof this.state>) => {\n    this.state = { ...this.state, ...newState };\n    this.notifyListeners();\n  };\n\n  private notifyListeners = () => {\n    this.listeners.forEach((listener) => listener());\n  };\n\n  subscribe = (listener: () => void): (() => void) => {\n    if (this.throttle === false) {\n      this.listeners.add(listener);\n      return () => this.listeners.delete(listener);\n    }\n\n    const timeoutMs = this.throttle === true ? 0 : this.throttle;\n    let timeoutId: NodeJS.Timeout | number | undefined;\n\n    const throttledListener = () => {\n      clearTimeout(timeoutId);\n      timeoutId = setTimeout(() => {\n        clearTimeout(timeoutId);\n        listener();\n      }, timeoutMs);\n    };\n\n    this.listeners.add(throttledListener);\n    return () => {\n      clearTimeout(timeoutId);\n      this.listeners.delete(throttledListener);\n    };\n  };\n\n  getSnapshot = () => this.state;\n\n  get isLoading() {\n    return this.state.isLoading;\n  }\n\n  get values() {\n    return this.state.values?.[0] ?? null;\n  }\n\n  get error() {\n    return this.state.error;\n  }\n\n  setStreamValues = (\n    values:\n      | (StateType | null)\n      | ((prev: StateType | null, kind: \"stream\" | \"stop\") => StateType | null),\n    kind: \"stream\" | \"stop\" = \"stream\"\n  ) => {\n    if (typeof values === \"function\") {\n      const [prevValues, prevKind] = this.state.values ?? [null, \"stream\"];\n      const nextValues = values(prevValues, prevKind);\n      this.setState({ values: nextValues != null ? [nextValues, kind] : null });\n    } else {\n      const nextValues = values != null ? [values, kind] : null;\n      this.setState({ values: nextValues as [StateType, \"stream\" | \"stop\"] });\n    }\n  };\n\n  private getMutateFn = (kind: \"stream\" | \"stop\", historyValues: StateType) => {\n    return (\n      update: Partial<StateType> | ((prev: StateType) => Partial<StateType>)\n    ) => {\n      const stateValues = (this.state.values ?? [null, \"stream\"])[0];\n      const prev = {\n        ...historyValues,\n        ...stateValues,\n      };\n      const next = typeof update === \"function\" ? update(prev) : update;\n      this.setStreamValues({ ...prev, ...next }, kind);\n    };\n  };\n\n  private matchEventType = <\n    T extends keyof EventStreamMap<\n      StateType,\n      GetUpdateType<Bag, StateType>,\n      GetCustomEventType<Bag>\n    >,\n  >(\n    expected: T,\n    actual: EventStreamEvent<\n      StateType,\n      GetUpdateType<Bag, StateType>,\n      GetCustomEventType<Bag>\n    >[\"event\"],\n    _data: EventStreamEvent<\n      StateType,\n      GetUpdateType<Bag, StateType>,\n      GetCustomEventType<Bag>\n    >[\"data\"]\n  ): _data is EventStreamMap<\n    StateType,\n    GetUpdateType<Bag, StateType>,\n    GetCustomEventType<Bag>\n  >[T][\"data\"] => {\n    return expected === actual || actual.startsWith(`${expected}|`);\n  };\n\n  protected enqueue = async (\n    action: (\n      signal: AbortSignal\n    ) => Promise<\n      AsyncGenerator<\n        EventStreamEvent<\n          StateType,\n          GetUpdateType<Bag, StateType>,\n          GetCustomEventType<Bag>\n        >\n      >\n    >,\n    options: {\n      getMessages: (values: StateType) => Message[];\n\n      setMessages: (current: StateType, messages: Message[]) => StateType;\n\n      initialValues: StateType;\n\n      callbacks: StreamManagerEventCallbacks<StateType, Bag>;\n\n      onSuccess: () =>\n        | StateType\n        | null\n        | undefined\n        | void\n        | Promise<StateType | null | undefined | void>;\n\n      onError: (error: unknown) => void | Promise<void>;\n\n      onFinish?: () => void;\n    }\n  ) => {\n    try {\n      this.queueSize = Math.max(0, this.queueSize - 1);\n      this.setState({ isLoading: true, error: undefined });\n      this.abortRef = new AbortController();\n\n      const run = await action(this.abortRef.signal);\n      let clearedPreviousInterrupts = false;\n\n      let streamError: StreamError | undefined;\n      for await (const { event, data } of run) {\n        if (event === \"error\") {\n          streamError = new StreamError(data);\n          break;\n        }\n\n        const namespace = event.includes(\"|\")\n          ? event.split(\"|\").slice(1)\n          : undefined;\n\n        const mutate = this.getMutateFn(\"stream\", options.initialValues);\n\n        if (event === \"metadata\") options.callbacks.onMetadataEvent?.(data);\n        if (event === \"events\") options.callbacks.onLangChainEvent?.(data);\n\n        if (this.matchEventType(\"updates\", event, data)) {\n          options.callbacks.onUpdateEvent?.(data, { namespace, mutate });\n\n          // Track subagent streaming updates from subgraph namespaces\n          // Mark the subagent as running when we receive updates\n          // The actual message content is handled via addMessageToSubagent\n          if (namespace && isSubagentNamespace(namespace)) {\n            const namespaceId = extractToolCallIdFromNamespace(namespace);\n            if (namespaceId && this.filterSubagentMessages) {\n              this.subagentManager.markRunningFromNamespace(\n                namespaceId,\n                namespace\n              );\n            }\n          }\n\n          // Also register subagents from main agent updates (tool_calls in messages)\n          // AND process tool results to complete subagents\n          // This is needed because tool_calls often appear complete in updates\n          // before they appear in the messages stream\n          if (!namespace || !isSubagentNamespace(namespace)) {\n            const updateData = data as Record<string, unknown>;\n            for (const nodeData of Object.values(updateData)) {\n              if (\n                nodeData &&\n                typeof nodeData === \"object\" &&\n                \"messages\" in nodeData\n              ) {\n                const { messages } = nodeData as { messages: unknown[] };\n                if (Array.isArray(messages)) {\n                  for (const msg of messages) {\n                    if (!msg || typeof msg !== \"object\") continue;\n                    const msgObj = msg as Record<string, unknown>;\n\n                    // Register subagents from AI messages with tool_calls\n                    if (\n                      msgObj.type === \"ai\" &&\n                      \"tool_calls\" in msgObj &&\n                      Array.isArray(msgObj.tool_calls)\n                    ) {\n                      this.subagentManager.registerFromToolCalls(\n                        msgObj.tool_calls as Array<{\n                          id?: string;\n                          name: string;\n                          args: Record<string, unknown> | string;\n                        }>,\n                        msgObj.id as string | undefined\n                      );\n                    }\n\n                    // Complete subagents from tool messages (task results)\n                    if (\n                      msgObj.type === \"tool\" &&\n                      \"tool_call_id\" in msgObj &&\n                      typeof msgObj.tool_call_id === \"string\"\n                    ) {\n                      const content =\n                        typeof msgObj.content === \"string\"\n                          ? msgObj.content\n                          : JSON.stringify(msgObj.content);\n                      const status =\n                        \"status\" in msgObj && msgObj.status === \"error\"\n                          ? \"error\"\n                          : \"success\";\n                      this.subagentManager.processToolMessage(\n                        msgObj.tool_call_id,\n                        content,\n                        status\n                      );\n                    }\n                  }\n                }\n              }\n            }\n          }\n        }\n\n        if (this.matchEventType(\"custom\", event, data)) {\n          options.callbacks.onCustomEvent?.(data, { namespace, mutate });\n        }\n\n        if (this.matchEventType(\"checkpoints\", event, data)) {\n          options.callbacks.onCheckpointEvent?.(data, { namespace });\n        }\n\n        if (this.matchEventType(\"tasks\", event, data)) {\n          options.callbacks.onTaskEvent?.(data, { namespace });\n        }\n\n        if (this.matchEventType(\"debug\", event, data)) {\n          options.callbacks.onDebugEvent?.(data, { namespace });\n        }\n\n        if (this.matchEventType(\"tools\", event, data)) {\n          options.callbacks.onToolEvent?.(data, { namespace, mutate });\n        }\n\n        // Handle values events - use startsWith to match both \"values\" and \"values|tools:xxx\"\n        if (event === \"values\" || event.startsWith(\"values|\")) {\n          // Check if this is a subgraph values event (for namespace mapping and values)\n          if (namespace && isSubagentNamespace(namespace)) {\n            const namespaceId = extractToolCallIdFromNamespace(namespace);\n            if (namespaceId && this.filterSubagentMessages) {\n              const valuesData = data as Record<string, unknown>;\n\n              // Try to establish namespace mapping from the initial human message\n              const messages = valuesData.messages as unknown[];\n              if (Array.isArray(messages) && messages.length > 0) {\n                const firstMsg = messages[0] as Record<string, unknown>;\n                if (\n                  firstMsg?.type === \"human\" &&\n                  typeof firstMsg?.content === \"string\"\n                ) {\n                  this.subagentManager.matchSubgraphToSubagent(\n                    namespaceId,\n                    firstMsg.content\n                  );\n                }\n              }\n\n              // Update the subagent's values with the full state\n              this.subagentManager.updateSubagentValues(\n                namespaceId,\n                valuesData\n              );\n            }\n          } else {\n            if (!clearedPreviousInterrupts) {\n              // Clear stale __interrupt__ from the previous run once the new\n              // stream starts delivering main values. This avoids carrying\n              // resumed interrupts forward while still preserving the previous\n              // interrupt state if the new stream fails before any values\n              // arrive.\n              this.setStreamValues((prev) => {\n                if (prev && \"__interrupt__\" in prev) {\n                  // eslint-disable-next-line @typescript-eslint/no-unused-vars\n                  const { __interrupt__, ...rest } = prev;\n                  return rest as StateType;\n                }\n                return prev;\n              });\n              clearedPreviousInterrupts = true;\n            }\n\n            if (data && typeof data === \"object\" && \"__interrupt__\" in data) {\n              // When parallel branches each raise an interrupt, the backend\n              // may stream separate values events per branch. We accumulate\n              // the __interrupt__ arrays so none are lost, but still honor an\n              // explicit empty array as \"clear interrupts\".\n              const interruptData = data as Partial<StateType> & {\n                __interrupt__?: Array<{ id?: string }>;\n              };\n              this.setStreamValues((prev) => {\n                const prevInterrupts = (\n                  prev as\n                    | (StateType & { __interrupt__?: Array<{ id?: string }> })\n                    | null\n                )?.__interrupt__;\n\n                let interrupts = interruptData.__interrupt__;\n                if (Array.isArray(interrupts)) {\n                  if (interrupts.length === 0) {\n                    interrupts = [];\n                  } else if (Array.isArray(prevInterrupts)) {\n                    const mergedInterrupts = [...prevInterrupts];\n                    const existingIds = new Set(\n                      prevInterrupts.map((i) => i.id).filter((id) => id != null)\n                    );\n                    for (const interrupt of interrupts) {\n                      if (interrupt.id != null) {\n                        if (existingIds.has(interrupt.id)) continue;\n                        existingIds.add(interrupt.id);\n                      }\n                      mergedInterrupts.push(interrupt);\n                    }\n                    interrupts = mergedInterrupts;\n                  }\n                }\n\n                return {\n                  ...prev,\n                  __interrupt__: interrupts,\n                } as unknown as StateType;\n              });\n            } else {\n              // Non-interrupt values events must not wipe accumulated\n              // __interrupt__ state. Preserve it when the incoming data\n              // does not carry its own __interrupt__ field.\n              this.setStreamValues((prev) => {\n                if (\n                  prev &&\n                  \"__interrupt__\" in prev &&\n                  Array.isArray((prev as Record<string, unknown>).__interrupt__)\n                ) {\n                  return {\n                    ...(data as StateType),\n                    __interrupt__: (prev as Record<string, unknown>)\n                      .__interrupt__,\n                  } as StateType;\n                }\n                return data as StateType;\n              });\n            }\n          }\n        }\n\n        if (this.matchEventType(\"messages\", event, data)) {\n          const [serialized, metadata] = data;\n\n          // Check if this message is from a subagent namespace\n          const eventCheckpointNs =\n            namespace && isSubagentNamespace(namespace) ? namespace : undefined;\n          const rawCheckpointNs =\n            (metadata?.langgraph_checkpoint_ns as string | undefined) ||\n            (metadata?.checkpoint_ns as string | undefined);\n          const checkpointNs: string[] | undefined =\n            eventCheckpointNs ??\n            (typeof rawCheckpointNs === \"string\"\n              ? rawCheckpointNs.split(\"|\")\n              : undefined);\n          const isFromSubagent = isSubagentNamespace(checkpointNs);\n          const toolCallId = isFromSubagent\n            ? extractToolCallIdFromNamespace(checkpointNs)\n            : undefined;\n\n          // If filtering is enabled and this is a subagent message,\n          // add it to the subagent's messages instead of the main stream\n          if (this.filterSubagentMessages && isFromSubagent && toolCallId) {\n            // Add to subagent's message list\n            this.subagentManager.addMessageToSubagent(\n              toolCallId,\n              serialized,\n              metadata\n            );\n            continue;\n          }\n\n          const messageId = this.messages.add(serialized, metadata);\n          if (!messageId) {\n            console.warn(\n              \"Failed to add message to manager, no message ID found\"\n            );\n            continue;\n          }\n\n          this.setStreamValues((streamValues) => {\n            const values = {\n              ...options.initialValues,\n              ...streamValues,\n            };\n\n            // Assumption: we're concatenating the message\n            let messages = options.getMessages(values).slice();\n            const { chunk, index } =\n              this.messages.get(messageId, messages.length) ?? {};\n\n            if (!chunk || index == null) return values;\n            if (chunk.getType() === \"remove\") {\n              // Check for special REMOVE_ALL_MESSAGES sentinel\n              if (chunk.id === REMOVE_ALL_MESSAGES) {\n                // Clear all messages when __remove_all__ is received\n                messages = [];\n              } else {\n                messages.splice(index, 1);\n              }\n            } else {\n              const msgDict = this.toMessage(chunk) as Message;\n              messages[index] = msgDict;\n\n              // Track subagents from AI messages with tool calls (main agent only)\n              if (\n                !isFromSubagent &&\n                msgDict.type === \"ai\" &&\n                \"tool_calls\" in msgDict &&\n                Array.isArray(msgDict.tool_calls)\n              ) {\n                this.subagentManager.registerFromToolCalls(\n                  msgDict.tool_calls,\n                  msgDict.id as string | undefined\n                );\n              }\n\n              // Complete subagents when tool messages arrive (main agent only)\n              if (\n                !isFromSubagent &&\n                msgDict.type === \"tool\" &&\n                \"tool_call_id\" in msgDict\n              ) {\n                const tcId = msgDict.tool_call_id as string;\n                const content =\n                  typeof msgDict.content === \"string\"\n                    ? msgDict.content\n                    : JSON.stringify(msgDict.content);\n                const status =\n                  \"status\" in msgDict && msgDict.status === \"error\"\n                    ? \"error\"\n                    : \"success\";\n                this.subagentManager.processToolMessage(tcId, content, status);\n              }\n            }\n\n            return options.setMessages(values, messages);\n          });\n        }\n      }\n\n      if (streamError != null) throw streamError;\n\n      // Skip onSuccess when the stream was aborted (e.g., by multitask interrupt).\n      // This avoids unnecessary HTTP calls (like history fetching) that would\n      // delay the next queued stream from starting.\n      if (!this.abortRef.signal.aborted) {\n        const values = await options.onSuccess?.();\n        if (typeof values !== \"undefined\" && this.queueSize === 0) {\n          this.setStreamValues(values);\n        }\n      }\n    } catch (error) {\n      if (\n        !(\n          error instanceof Error && // eslint-disable-line no-instanceof/no-instanceof\n          (error.name === \"AbortError\" || error.name === \"TimeoutError\")\n        )\n      ) {\n        console.error(error);\n        this.setState({ error });\n        await options.onError?.(error);\n      }\n    } finally {\n      this.setState({ isLoading: false });\n      this.abortRef = new AbortController();\n      options.onFinish?.();\n    }\n  };\n\n  start = async (\n    action: (\n      signal: AbortSignal\n    ) => Promise<\n      AsyncGenerator<\n        EventStreamEvent<\n          StateType,\n          GetUpdateType<Bag, StateType>,\n          GetCustomEventType<Bag>\n        >\n      >\n    >,\n    options: {\n      getMessages: (values: StateType) => Message[];\n\n      setMessages: (current: StateType, messages: Message[]) => StateType;\n\n      initialValues: StateType;\n\n      callbacks: StreamManagerEventCallbacks<StateType, Bag>;\n\n      onSuccess: () =>\n        | StateType\n        | null\n        | undefined\n        | void\n        | Promise<StateType | null | undefined | void>;\n\n      onError: (error: unknown) => void | Promise<void>;\n\n      onFinish?: () => void;\n    },\n    startOptions?: {\n      /**\n       * If true, abort any currently running stream before starting this one.\n       * Used for multitask_strategy: \"interrupt\" and \"rollback\" to unblock\n       * the queue so the new run request can proceed immediately.\n       */\n      abortPrevious?: boolean;\n    }\n  ): Promise<void> => {\n    if (startOptions?.abortPrevious) {\n      this.abortRef.abort();\n    }\n    this.queueSize += 1;\n    const queued = this.queue.then(() => this.enqueue(action, options));\n    this.queue = queued;\n    await queued;\n  };\n\n  stop = async (\n    historyValues: StateType,\n    options: {\n      onStop?: (options: {\n        mutate: (\n          update: Partial<StateType> | ((prev: StateType) => Partial<StateType>)\n        ) => void;\n      }) => void;\n    }\n  ): Promise<void> => {\n    this.abortRef.abort();\n    this.abortRef = new AbortController();\n\n    options.onStop?.({ mutate: this.getMutateFn(\"stop\", historyValues) });\n  };\n\n  clear = () => {\n    // Cancel any running streams\n    this.abortRef.abort();\n    this.abortRef = new AbortController();\n\n    // Set the stream state to null\n    this.setState({ error: undefined, values: null, isLoading: false });\n\n    // Clear any pending messages\n    this.messages.clear();\n\n    // Clear subagent state\n    this.subagentManager.clear();\n  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