Simple Document Processing MCP Server

Instructions

Implementation Reference

• src/tools/htmlTools.ts:165-203 (handler)

  The core execution function for the html_to_text tool. Reads HTML file using fs, parses with JSDOM, extracts textContent from body, generates unique filename, writes to output directory.

  export async function htmlToText(inputPath: string, outputDir: string) {
    try {
      console.error(`Starting HTML to text 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 dom = new JSDOM(htmlContent);
      const { document } = dom.window;
  
      // 保留結構的文字轉換
      const text = document.body.textContent?.trim() || "";
      const outputPath = path.join(outputDir, `text_${uniqueId}.txt`);
      await fs.writeFile(outputPath, text);
      console.error(`Written text to ${outputPath}`);
  
      return {
        success: true,
        data: `Successfully converted HTML to text: ${outputPath}`,
      };
    } catch (error) {
      console.error(`Error in htmlToText:`, error);
      return {
        success: false,
        error: error instanceof Error ? error.message : "Unknown error",
      };
    }
  }

• src/tools/htmlTools.ts:33-50 (schema)

  The Tool object definition for html_to_text, including name, description, and inputSchema for MCP validation.

  export const HTML_TO_TEXT_TOOL: Tool = {
    name: "html_to_text",
    description: "Convert HTML to plain text while preserving structure",
    inputSchema: {
      type: "object",
      properties: {
        inputPath: {
          type: "string",
          description: "Path to the input HTML file",
        },
        outputDir: {
          type: "string",
          description: "Directory where text file should be saved",
        },
      },
      required: ["inputPath", "outputDir"],
    },
  };

• src/tools/_index.ts:5-9 (registration)

  Imports HTML_TO_TEXT_TOOL from htmlTools.ts and registers it in the central 'tools' array exported for the MCP server.

  import { HTML_CLEAN_TOOL, HTML_EXTRACT_RESOURCES_TOOL, HTML_FORMAT_TOOL, HTML_TO_MARKDOWN_TOOL, HTML_TO_TEXT_TOOL } from "./htmlTools.js";
  import { PDF_MERGE_TOOL, PDF_SPLIT_TOOL } from "./pdfTools.js";
  import { TEXT_DIFF_TOOL, TEXT_ENCODING_CONVERT_TOOL, TEXT_FORMAT_TOOL, TEXT_SPLIT_TOOL } from "./txtTools.js";
  
  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:47-49 (registration)

  MCP server handler for listing tools, returns the 'tools' array which includes html_to_text.

  server.setRequestHandler(ListToolsRequestSchema, async () => ({
    tools,
  }));

• src/index.ts:168-184 (handler)

  MCP CallToolRequestSchema dispatcher that matches name 'html_to_text', extracts args, calls htmlToText handler, and formats response.

  if (name === "html_to_text") {
    const { inputPath, outputDir } = args as {
      inputPath: string;
      outputDir: string;
    };
    const result = await htmlToText(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,
    };
  }