TaskFlow MCP

Instructions

Implementation Reference

• src/tools/TaskFlowTools.ts:610-613 (handler)

  MCP tool handler function that parses input arguments and delegates execution to TaskFlowService.updateSubtask method.

  async update_subtask(args: any) {
    const { requestId, taskId, subtaskId, title, description } = args ?? {};
    return service.updateSubtask(String(requestId), String(taskId), String(subtaskId), { title, description });
  },

• src/services/TaskFlowService.ts:481-509 (helper)

  Core service method implementing the update logic: loads data, validates request/task/subtask existence and incompletion status, sanitizes and applies updates to title/description, persists changes to file, generates progress table, and returns structured response.

  public async updateSubtask(
    requestId: string,
    taskId: string,
    subtaskId: string,
    updates: { title?: string; description?: string }
  ) {
    await this.loadTasks();
    const req = this.getRequest(requestId);
    if (!req) return { status: "error", message: "Request not found" };
  
    const task = req.tasks.find((t) => t.id === taskId);
    if (!task) return { status: "error", message: "Task not found" };
  
    const subtask = task.subtasks.find((s) => s.id === subtaskId);
    if (!subtask) return { status: "error", message: "Subtask not found" };
    if (subtask.done) return { status: "error", message: "Cannot update completed subtask" };
  
    if (updates.title) subtask.title = sanitizeString(updates.title);
    if (updates.description) subtask.description = sanitizeString(updates.description);
  
    await this.saveTasks();
  
    const progressTable = formatTaskProgressTableForRequest(req);
    return {
      status: "subtask_updated",
      message: `Subtask ${subtaskId} has been updated.\n${progressTable}`,
      subtask: { id: subtask.id, title: subtask.title, description: subtask.description, done: subtask.done },
    };
  }

• src/schemas/TaskFlowSchemas.ts:179-189 (schema)

  JSON Schema defining the input parameters and validation rules for the update_subtask tool.

  update_subtask: {
    type: "object",
    properties: {
      requestId: { type: "string" },
      taskId: { type: "string" },
      subtaskId: { type: "string" },
      title: { type: "string" },
      description: { type: "string" },
    },
    required: ["requestId", "taskId", "subtaskId"],
  },

• src/server/TaskFlowServer.ts:63-90 (registration)

  Server registration of the UPDATE_SUBTASK_TOOL in the listTools handler response, making it discoverable to MCP clients.

  this.server.setRequestHandler(ListToolsRequestSchema, async () => ({
    tools: [
      PLAN_TASK_TOOL,
      GET_NEXT_TASK_TOOL,
      MARK_TASK_DONE_TOOL,
      OPEN_TASK_DETAILS_TOOL,
      LIST_REQUESTS_TOOL,
      ADD_TASKS_TO_REQUEST_TOOL,
      UPDATE_TASK_TOOL,
      DELETE_TASK_TOOL,
      ADD_SUBTASKS_TOOL,
      MARK_SUBTASK_DONE_TOOL,
      UPDATE_SUBTASK_TOOL,
      DELETE_SUBTASK_TOOL,
      EXPORT_TASK_STATUS_TOOL,
      ADD_NOTE_TOOL,
      UPDATE_NOTE_TOOL,
      DELETE_NOTE_TOOL,
      ADD_DEPENDENCY_TOOL,
      GET_PROMPTS_TOOL,
      SET_PROMPTS_TOOL,
      UPDATE_PROMPTS_TOOL,
      REMOVE_PROMPTS_TOOL,
      ARCHIVE_COMPLETED_REQUESTS_TOOL,
      LIST_ARCHIVED_REQUESTS_TOOL,
      RESTORE_ARCHIVED_REQUEST_TOOL,
    ],
  }));

• src/tools/TaskFlowTools.ts:280-297 (registration)

  Tool object definition exported for registration, including name, description, and inline inputSchema.

  export const UPDATE_SUBTASK_TOOL: Tool = {
    name: "update_subtask",
    description:
      "Update a subtask's title or description. Provide 'requestId', 'taskId', 'subtaskId', and optionally 'title' and/or 'description'.\n\n" +
      "Only uncompleted subtasks can be updated.\n\n" +
      "A progress table will be displayed showing the updated task with its subtasks.",
    inputSchema: {
      type: "object",
      properties: {
        requestId: { type: "string" },
        taskId: { type: "string" },
        subtaskId: { type: "string" },
        title: { type: "string" },
        description: { type: "string" },
      },
      required: ["requestId", "taskId", "subtaskId"],
    },
  };