langchain/dist/agents/nodes/ToolNode.cjs.map

Typescript bindings for langchain

{"version":3,"file":"ToolNode.cjs","names":["input: unknown","BaseMessage","error: unknown","toolCall: ToolCall","ToolInvocationError","ToolMessage","RunnableCallable","tools: (StructuredToolInterface | DynamicTool | RunnableToolLike)[]","options?: ToolNodeOptions","call: ToolCall","isMiddlewareError: boolean","config: RunnableConfig","state: AgentBuiltInState","request: ToolCallRequest","request","tool","mergeAbortSignals","e: unknown","ToolInputParsingException","#handleError","state: ToAnnotationRoot<StateSchema>[\"State\"] & AgentBuiltInState","outputs: (ToolMessage | Command)[]","messages: BaseMessage[]","toolMessageIds: Set<string>","aiMessage: AIMessage | undefined","AIMessage","isCommand","combinedOutputs: (\n      | { messages: BaseMessage[] }\n      | BaseMessage[]\n      | Command\n    )[]","parentCommand: Command | null","Command","x: unknown","Send"],"sources":["../../../src/agents/nodes/ToolNode.ts"],"sourcesContent":["/* eslint-disable @typescript-eslint/no-explicit-any */\n/* eslint-disable no-instanceof/no-instanceof */\nimport { BaseMessage, ToolMessage, AIMessage } from \"@langchain/core/messages\";\nimport { RunnableConfig, RunnableToolLike } from \"@langchain/core/runnables\";\nimport {\n  DynamicTool,\n  StructuredToolInterface,\n  ToolInputParsingException,\n} from \"@langchain/core/tools\";\nimport type { ToolCall } from \"@langchain/core/messages/tool\";\nimport type { InteropZodObject } from \"@langchain/core/utils/types\";\nimport {\n  isCommand,\n  Command,\n  Send,\n  isGraphInterrupt,\n  type LangGraphRunnableConfig,\n} from \"@langchain/langgraph\";\n\nimport { RunnableCallable } from \"../RunnableCallable.js\";\nimport { mergeAbortSignals } from \"./utils.js\";\nimport { ToolInvocationError } from \"../errors.js\";\nimport type {\n  WrapToolCallHook,\n  ToolCallRequest,\n  ToAnnotationRoot,\n} from \"../middleware/types.js\";\nimport type { AgentBuiltInState } from \"../runtime.js\";\n\n/**\n * The name of the tool node in the state graph.\n */\nexport const TOOLS_NODE_NAME = \"tools\";\n\nexport interface ToolNodeOptions {\n  /**\n   * The name of the tool node.\n   */\n  name?: string;\n  /**\n   * The tags to add to the tool call.\n   */\n  tags?: string[];\n  /**\n   * The abort signal to cancel the tool call.\n   */\n  signal?: AbortSignal;\n  /**\n   * Whether to throw the error immediately if the tool fails or handle it by the `onToolError` function or via ToolMessage.\n   *\n   * **Default behavior** (matches Python):\n   *   - Catches only `ToolInvocationError` (invalid arguments from model) and converts to ToolMessage\n   *   - Re-raises all other errors including errors from `wrapToolCall` middleware\n   *\n   * If `true`:\n   *   - Catches all errors and returns a ToolMessage with the error\n   *\n   * If `false`:\n   *   - All errors are thrown immediately\n   *\n   * If a function is provided:\n   *   - If function returns a `ToolMessage`, use it as the result\n   *   - If function returns `undefined`, re-raise the error\n   *\n   * @default A function that only catches ToolInvocationError\n   */\n  handleToolErrors?:\n    | boolean\n    | ((error: unknown, toolCall: ToolCall) => ToolMessage | undefined);\n  /**\n   * Optional wrapper function for tool execution.\n   * Allows middleware to intercept and modify tool calls before execution.\n   * The wrapper receives the tool call request and a handler function to execute the tool.\n   */\n  wrapToolCall?: WrapToolCallHook;\n}\n\nconst isBaseMessageArray = (input: unknown): input is BaseMessage[] =>\n  Array.isArray(input) && input.every(BaseMessage.isInstance);\n\nconst isMessagesState = (\n  input: unknown\n): input is { messages: BaseMessage[] } =>\n  typeof input === \"object\" &&\n  input != null &&\n  \"messages\" in input &&\n  isBaseMessageArray(input.messages);\n\nconst isSendInput = (input: unknown): input is { lg_tool_call: ToolCall } =>\n  typeof input === \"object\" && input != null && \"lg_tool_call\" in input;\n\n/**\n * Default error handler for tool errors.\n *\n * This is applied to errors from baseHandler (tool execution).\n * For errors from wrapToolCall middleware, those are handled separately\n * and will bubble up by default.\n *\n * Catches all tool execution errors and converts them to ToolMessage.\n * This allows the LLM to see the error and potentially retry with different arguments.\n */\nfunction defaultHandleToolErrors(\n  error: unknown,\n  toolCall: ToolCall\n): ToolMessage | undefined {\n  if (error instanceof ToolInvocationError) {\n    return new ToolMessage({\n      content: error.message,\n      tool_call_id: toolCall.id!,\n      name: toolCall.name,\n    });\n  }\n  /**\n   * Catch all other tool errors and convert to ToolMessage\n   */\n  return new ToolMessage({\n    content: `${error}\\n Please fix your mistakes.`,\n    tool_call_id: toolCall.id!,\n    name: toolCall.name,\n  });\n}\n\n/**\n * `ToolNode` is a built-in LangGraph component that handles tool calls within an agent's workflow.\n * It works seamlessly with `createAgent`, offering advanced tool execution control, built\n * in parallelism, and error handling.\n *\n * @example\n * ```ts\n * import { ToolNode, tool, AIMessage } from \"langchain\";\n * import { z } from \"zod/v3\";\n *\n * const getWeather = tool((input) => {\n *   if ([\"sf\", \"san francisco\"].includes(input.location.toLowerCase())) {\n *     return \"It's 60 degrees and foggy.\";\n *   } else {\n *     return \"It's 90 degrees and sunny.\";\n *   }\n * }, {\n *   name: \"get_weather\",\n *   description: \"Call to get the current weather.\",\n *   schema: z.object({\n *     location: z.string().describe(\"Location to get the weather for.\"),\n *   }),\n * });\n *\n * const tools = [getWeather];\n * const toolNode = new ToolNode(tools);\n *\n * const messageWithSingleToolCall = new AIMessage({\n *   content: \"\",\n *   tool_calls: [\n *     {\n *       name: \"get_weather\",\n *       args: { location: \"sf\" },\n *       id: \"tool_call_id\",\n *       type: \"tool_call\",\n *     }\n *   ]\n * })\n *\n * await toolNode.invoke({ messages: [messageWithSingleToolCall] });\n * // Returns tool invocation responses as:\n * // { messages: ToolMessage[] }\n * ```\n */\nexport class ToolNode<\n  StateSchema extends InteropZodObject = any,\n  ContextSchema extends InteropZodObject = any,\n> extends RunnableCallable<StateSchema, ContextSchema> {\n  tools: (StructuredToolInterface | DynamicTool | RunnableToolLike)[];\n\n  trace = false;\n\n  signal?: AbortSignal;\n\n  handleToolErrors:\n    | boolean\n    | ((error: unknown, toolCall: ToolCall) => ToolMessage | undefined) =\n    defaultHandleToolErrors;\n\n  wrapToolCall: WrapToolCallHook | undefined;\n\n  constructor(\n    tools: (StructuredToolInterface | DynamicTool | RunnableToolLike)[],\n    public options?: ToolNodeOptions\n  ) {\n    const { name, tags, handleToolErrors, signal, wrapToolCall } =\n      options ?? {};\n    super({\n      name,\n      tags,\n      func: (state, config) =>\n        this.run(\n          state as ToAnnotationRoot<StateSchema>[\"State\"] & AgentBuiltInState,\n          config as RunnableConfig\n        ),\n    });\n    this.tools = tools;\n    this.handleToolErrors = handleToolErrors ?? this.handleToolErrors;\n    this.signal = signal;\n    this.wrapToolCall = wrapToolCall;\n  }\n\n  /**\n   * Handle errors from tool execution or middleware.\n   * @param error - The error to handle\n   * @param call - The tool call that caused the error\n   * @param isMiddlewareError - Whether the error came from wrapToolCall middleware\n   * @returns ToolMessage if error is handled, otherwise re-throws\n   */\n  #handleError(\n    error: unknown,\n    call: ToolCall,\n    isMiddlewareError: boolean\n  ): ToolMessage {\n    /**\n     * {@link NodeInterrupt} errors are a breakpoint to bring a human into the loop.\n     * As such, they are not recoverable by the agent and shouldn't be fed\n     * back. Instead, re-throw these errors even when `handleToolErrors = true`.\n     */\n    if (isGraphInterrupt(error)) {\n      throw error;\n    }\n\n    /**\n     * If the signal is aborted, we want to bubble up the error to the invoke caller.\n     */\n    if (this.signal?.aborted) {\n      throw error;\n    }\n\n    /**\n     * If error is from middleware and handleToolErrors is not true, bubble up\n     * (default handler and false both re-raise middleware errors)\n     */\n    if (isMiddlewareError && this.handleToolErrors !== true) {\n      throw error;\n    }\n\n    /**\n     * If handleToolErrors is false, throw all errors\n     */\n    if (!this.handleToolErrors) {\n      throw error;\n    }\n\n    /**\n     * Apply handleToolErrors to the error\n     */\n    if (typeof this.handleToolErrors === \"function\") {\n      const result = this.handleToolErrors(error, call);\n      if (result && ToolMessage.isInstance(result)) {\n        return result;\n      }\n\n      /**\n       * `handleToolErrors` returned undefined - re-raise\n       */\n      throw error;\n    } else if (this.handleToolErrors) {\n      return new ToolMessage({\n        name: call.name,\n        content: `${error}\\n Please fix your mistakes.`,\n        tool_call_id: call.id!,\n      });\n    }\n\n    /**\n     * Shouldn't reach here, but throw as fallback\n     */\n    throw error;\n  }\n\n  protected async runTool(\n    call: ToolCall,\n    config: RunnableConfig,\n    state: AgentBuiltInState\n  ): Promise<ToolMessage | Command> {\n    /**\n     * Define the base handler that executes the tool.\n     * When wrapToolCall middleware is present, this handler does NOT catch errors\n     * so the middleware can handle them.\n     * When no middleware, errors are caught and handled here.\n     */\n    const baseHandler = async (\n      request: ToolCallRequest\n    ): Promise<ToolMessage | Command> => {\n      const { toolCall } = request;\n      const tool = this.tools.find((tool) => tool.name === toolCall.name);\n      if (tool === undefined) {\n        throw new Error(`Tool \"${toolCall.name}\" not found.`);\n      }\n\n      try {\n        const output = await tool.invoke(\n          { ...toolCall, type: \"tool_call\" },\n          {\n            ...config,\n            /**\n             * extend to match ToolRuntime\n             */\n            config,\n            toolCallId: toolCall.id!,\n            state: config.configurable?.__pregel_scratchpad?.currentTaskInput,\n            signal: mergeAbortSignals(this.signal, config.signal),\n          }\n        );\n\n        if (ToolMessage.isInstance(output) || isCommand(output)) {\n          return output as ToolMessage | Command;\n        }\n\n        return new ToolMessage({\n          name: tool.name,\n          content: typeof output === \"string\" ? output : JSON.stringify(output),\n          tool_call_id: toolCall.id!,\n        });\n      } catch (e: unknown) {\n        /**\n         * Handle errors from tool execution (not from wrapToolCall)\n         * If tool invocation fails due to input parsing error, throw a {@link ToolInvocationError}\n         */\n        if (e instanceof ToolInputParsingException) {\n          throw new ToolInvocationError(e, toolCall);\n        }\n        /**\n         * Re-throw to be handled by caller\n         */\n        throw e;\n      }\n    };\n\n    /**\n     * Build runtime from LangGraph config\n     */\n    const lgConfig = config as LangGraphRunnableConfig;\n    const runtime = {\n      context: lgConfig?.context,\n      writer: lgConfig?.writer,\n      interrupt: lgConfig?.interrupt,\n      signal: lgConfig?.signal,\n    };\n\n    /**\n     * Find the tool instance to include in the request\n     */\n    const tool = this.tools.find((t) => t.name === call.name);\n    if (!tool) {\n      throw new Error(`Tool \"${call.name}\" not found.`);\n    }\n\n    const request = {\n      toolCall: call,\n      tool,\n      state,\n      runtime,\n    };\n\n    /**\n     * If wrapToolCall is provided, use it to wrap the tool execution\n     */\n    if (this.wrapToolCall) {\n      try {\n        return await this.wrapToolCall(request, baseHandler);\n      } catch (e: unknown) {\n        /**\n         * Handle middleware errors\n         */\n        return this.#handleError(e, call, true);\n      }\n    }\n\n    /**\n     * No wrapToolCall - execute tool directly and handle errors here\n     */\n    try {\n      return await baseHandler(request);\n    } catch (e: unknown) {\n      /**\n       * Handle tool errors when no middleware provided\n       */\n      return this.#handleError(e, call, false);\n    }\n  }\n\n  protected async run(\n    state: ToAnnotationRoot<StateSchema>[\"State\"] & AgentBuiltInState,\n    config: RunnableConfig\n  ): Promise<ContextSchema> {\n    let outputs: (ToolMessage | Command)[];\n\n    if (isSendInput(state)) {\n      const { lg_tool_call, jumpTo, ...newState } = state;\n      outputs = [await this.runTool(state.lg_tool_call, config, newState)];\n    } else {\n      let messages: BaseMessage[];\n      if (isBaseMessageArray(state)) {\n        messages = state;\n      } else if (isMessagesState(state)) {\n        messages = state.messages;\n      } else {\n        throw new Error(\n          \"ToolNode only accepts BaseMessage[] or { messages: BaseMessage[] } as input.\"\n        );\n      }\n\n      const toolMessageIds: Set<string> = new Set(\n        messages\n          .filter((msg) => msg.getType() === \"tool\")\n          .map((msg) => (msg as ToolMessage).tool_call_id)\n      );\n\n      let aiMessage: AIMessage | undefined;\n      for (let i = messages.length - 1; i >= 0; i -= 1) {\n        const message = messages[i];\n        if (AIMessage.isInstance(message)) {\n          aiMessage = message;\n          break;\n        }\n      }\n\n      if (!AIMessage.isInstance(aiMessage)) {\n        throw new Error(\"ToolNode only accepts AIMessages as input.\");\n      }\n\n      outputs = await Promise.all(\n        aiMessage.tool_calls\n          ?.filter((call) => call.id == null || !toolMessageIds.has(call.id))\n          .map((call) => this.runTool(call, config, state)) ?? 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