Local Dev Bridge MCP

Instructions

Implementation Reference

• index.js:243-262 (handler)

  The handler function that implements the logic for the 'edit_file' tool: reads the file, checks if old_text exists, replaces it with new_text, and writes the file back.

  async editFile(filePath, oldText, newText) {
    const resolvedPath = this.resolvePath(filePath);
    let content = await fs.readFile(resolvedPath, 'utf-8');
    
    if (!content.includes(oldText)) {
      throw new Error(`Text not found in file: ${oldText.substring(0, 50)}...`);
    }
    
    content = content.replace(oldText, newText);
    await fs.writeFile(resolvedPath, content, 'utf-8');
    
    return {
      content: [
        {
          type: 'text',
          text: `File edited successfully: ${resolvedPath}`,
        },
      ],
    };
  }

• index.js:79-100 (registration)

  Registration of the 'edit_file' tool in the ListTools response, including name, description, and input schema.

  {
    name: 'edit_file',
    description: 'Edit a file by replacing specific text. The old_text must match exactly (including whitespace).',
    inputSchema: {
      type: 'object',
      properties: {
        path: {
          type: 'string',
          description: 'Path to the file',
        },
        old_text: {
          type: 'string',
          description: 'Text to find and replace (must match exactly)',
        },
        new_text: {
          type: 'string',
          description: 'Text to replace it with',
        },
      },
      required: ['path', 'old_text', 'new_text'],
    },
  },

• index.js:169-170 (handler)

  The switch case in the CallToolRequestHandler that dispatches 'edit_file' calls to the editFile method.

  case 'edit_file':
    return await this.editFile(args.path, args.old_text, args.new_text);

• index.js:82-99 (schema)

  The input schema defining the parameters for the 'edit_file' tool.

  inputSchema: {
    type: 'object',
    properties: {
      path: {
        type: 'string',
        description: 'Path to the file',
      },
      old_text: {
        type: 'string',
        description: 'Text to find and replace (must match exactly)',
      },
      new_text: {
        type: 'string',
        description: 'Text to replace it with',
      },
    },
    required: ['path', 'old_text', 'new_text'],
  },