import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { McpError, ErrorCode } from "@modelcontextprotocol/sdk/types.js";
import { TOOL_NAME, TOOL_DESCRIPTION, TOOL_PARAMS, ExpandTaskArgs } from "./expandTaskParams.js";
import { TaskService } from "../services/TaskService.js";
import { logger } from '../utils/logger.js';
import { NotFoundError, ConflictError } from "../utils/errors.js"; // Import specific errors
/**
* Registers the expandTask tool with the MCP server.
*
* @param server - The McpServer instance.
* @param taskService - An instance of the TaskService.
*/
export const expandTaskTool = (server: McpServer, taskService: TaskService): void => {
const processRequest = async (args: ExpandTaskArgs) => {
logger.info(`[${TOOL_NAME}] Received request with args:`, args);
try {
// Call the service method to expand the task
const updatedParentTask = await taskService.expandTask({
project_id: args.project_id,
task_id: args.task_id,
subtask_descriptions: args.subtask_descriptions,
force: args.force,
});
// Format the successful response
logger.info(`[${TOOL_NAME}] Successfully expanded task ${args.task_id} in project ${args.project_id}`);
return {
content: [{
type: "text" as const,
// Return the updated parent task details, including new subtasks
text: JSON.stringify(updatedParentTask)
}]
};
} catch (error: unknown) {
// Handle potential errors
logger.error(`[${TOOL_NAME}] Error processing request:`, error);
if (error instanceof NotFoundError) {
// Project or parent task not found
throw new McpError(ErrorCode.InvalidParams, error.message);
} else if (error instanceof ConflictError) {
// Subtasks exist and force=false - map to InvalidParams as the request is invalid without force=true
throw new McpError(ErrorCode.InvalidParams, error.message);
} else {
// Generic internal error
const message = error instanceof Error ? error.message : 'An unknown error occurred while expanding the task.';
throw new McpError(ErrorCode.InternalError, message);
}
}
};
// Register the tool with the server
server.tool(TOOL_NAME, TOOL_DESCRIPTION, TOOL_PARAMS.shape, processRequest);
logger.info(`[${TOOL_NAME}] Tool registered successfully.`);
};
