Simple Document Processing MCP Server

Instructions

Implementation Reference

• src/tools/txtTools.ts:160-201 (handler)

  Implements the core logic for the 'text_formatter' tool: reads UTF-8 text file, formats by trimming lines and removing consecutive empty lines, generates unique output filename, saves to specified directory.

  export async function formatText(inputPath: string, outputDir: string) {
    try {
      console.error(`Starting text formatting...`);
      console.error(`Input file: ${inputPath}`);
      console.error(`Output directory: ${outputDir}`);
  
      // 確保輸出目錄存在
      try {
        await fs.access(outputDir);
        console.error(`Output directory exists: ${outputDir}`);
      } catch {
        console.error(`Creating output directory: ${outputDir}`);
        await fs.mkdir(outputDir, { recursive: true });
        console.error(`Created output directory: ${outputDir}`);
      }
  
      const uniqueId = generateUniqueId();
      const content = await fs.readFile(inputPath, "utf-8");
  
      // 基本格式化：移除多餘空白行，統一縮排
      const formatted = content
        .split("\n")
        .map((line) => line.trim())
        .filter((line, index, array) => !(line === "" && array[index - 1] === ""))
        .join("\n");
  
      const outputPath = path.join(outputDir, `formatted_${uniqueId}.txt`);
      await fs.writeFile(outputPath, formatted);
      console.error(`Written formatted text to ${outputPath}`);
  
      return {
        success: true,
        data: `Successfully formatted text: ${outputPath}`,
      };
    } catch (error) {
      console.error(`Error in formatText:`, error);
      return {
        success: false,
        error: error instanceof Error ? error.message : "Unknown error",
      };
    }
  }

• src/tools/txtTools.ts:41-58 (schema)

  Defines the Tool object for 'text_formatter' including name, description, and inputSchema specifying required inputPath and outputDir parameters.

  export const TEXT_FORMAT_TOOL: Tool = {
    name: "text_formatter",
    description: "Format text with proper indentation and line spacing",
    inputSchema: {
      type: "object",
      properties: {
        inputPath: {
          type: "string",
          description: "Path to the input text file",
        },
        outputDir: {
          type: "string",
          description: "Directory where formatted file should be saved",
        },
      },
      required: ["inputPath", "outputDir"],
    },
  };

• src/index.ts:265-281 (registration)

  Registers and dispatches 'text_formatter' tool calls within the main CallToolRequest handler by invoking the formatText function and formatting the response.

  if (name === "text_formatter") {
    const { inputPath, outputDir } = args as {
      inputPath: string;
      outputDir: string;
    };
    const result = await formatText(inputPath, outputDir);
    if (!result.success) {
      return {
        content: [{ type: "text", text: `Error: ${result.error}` }],
        isError: true,
      };
    }
    return {
      content: [{ type: "text", text: fileOperationResponse(result.data) }],
      isError: false,
    };
  }

• src/tools/_index.ts:9-9 (registration)

  Includes TEXT_FORMAT_TOOL in the exported 'tools' array used by ListToolsRequest to advertise available tools.

  export const tools = [DOCUMENT_READER_TOOL, PDF_MERGE_TOOL, PDF_SPLIT_TOOL, DOCX_TO_PDF_TOOL, DOCX_TO_HTML_TOOL, HTML_CLEAN_TOOL, HTML_TO_TEXT_TOOL, HTML_TO_MARKDOWN_TOOL, HTML_EXTRACT_RESOURCES_TOOL, HTML_FORMAT_TOOL, TEXT_DIFF_TOOL, TEXT_SPLIT_TOOL, TEXT_FORMAT_TOOL, TEXT_ENCODING_CONVERT_TOOL, EXCEL_READ_TOOL, FORMAT_CONVERTER_TOOL];

• src/tools/txtTools.ts:8-10 (helper)

  Helper function to generate unique IDs for output filenames, used in the text_formatter handler.

  function generateUniqueId(): string {
    return randomBytes(9).toString("hex");
  }