Simple Document Processing MCP Server

Instructions

Implementation Reference

• src/tools/htmlTools.ts:206-242 (handler)

  The core handler function that reads an HTML file from inputPath, converts it to Markdown using TurndownService, generates a unique filename, saves it to outputDir, and returns success/error info.

  export async function htmlToMarkdown(inputPath: string, outputDir: string) {
    try {
      console.error(`Starting HTML to Markdown conversion...`);
      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 htmlContent = await fs.readFile(inputPath, "utf-8");
      const turndownService = new TurndownService();
      const markdown = turndownService.turndown(htmlContent);
  
      const outputPath = path.join(outputDir, `markdown_${uniqueId}.md`);
      await fs.writeFile(outputPath, markdown);
      console.error(`Written Markdown to ${outputPath}`);
  
      return {
        success: true,
        data: `Successfully converted HTML to Markdown: ${outputPath}`,
      };
    } catch (error) {
      console.error(`Error in htmlToMarkdown:`, error);
      return {
        success: false,
        error: error instanceof Error ? error.message : "Unknown error",
      };
    }
  }

• src/tools/htmlTools.ts:53-70 (schema)

  Defines the tool's metadata, name, description, and input schema (requiring inputPath and outputDir strings).

  export const HTML_TO_MARKDOWN_TOOL: Tool = {
    name: "html_to_markdown",
    description: "Convert HTML to Markdown format",
    inputSchema: {
      type: "object",
      properties: {
        inputPath: {
          type: "string",
          description: "Path to the input HTML file",
        },
        outputDir: {
          type: "string",
          description: "Directory where Markdown file should be saved",
        },
      },
      required: ["inputPath", "outputDir"],
    },
  };

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

  Registers HTML_TO_MARKDOWN_TOOL in the central tools array exported for use in the MCP server.

  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/index.ts:186-202 (handler)

  Dispatch handler in the main MCP server that matches the tool name, extracts arguments, calls the htmlToMarkdown function, and formats the response.

  if (name === "html_to_markdown") {
    const { inputPath, outputDir } = args as {
      inputPath: string;
      outputDir: string;
    };
    const result = await htmlToMarkdown(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/htmlTools.ts:8-10 (helper)

  Helper function to generate unique IDs for output filenames, used in htmlToMarkdown.

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