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Implementation Reference

• src/core/mcp-server.ts:397-424 (handler)

  Generic handler for all MCP 'tools/call' requests. Validates tool existence and returns a placeholder response for 'read_file' and other tools, as actual execution is not implemented.

  /**
   * Handles the tools/call request
   */
  private async handleToolsCall(params: { name: string, arguments?: any }): Promise<CallToolResult> {
    const { name, arguments: args } = params;
    
    if (!name) {
      throw new Error('Tool name is required');
    }
    
    const tool = this.tools.get(name);
    
    if (!tool) {
      throw new Error(`Tool not found: ${name}`);
    }
    
    // In a real implementation, we would execute the tool here
    // For now, we'll just return a placeholder
    
    return {
      content: [
        {
          type: 'text',
          text: `Executed tool ${name} with arguments: ${JSON.stringify(args)}`
        } as TextContent
      ]
    };
  }

• src/index.ts:137-158 (schema)

  Input schema and metadata for the 'read_file' tool, defining parameters path (required) and encoding (optional).

  mcpServer.registerTool({
    name: 'read_file',
    description: 'Read the contents of a file',
    inputSchema: {
      type: 'object',
      properties: {
        path: {
          type: 'string',
          description: 'Path to the file to read'
        },
        encoding: {
          type: 'string',
          description: 'Encoding to use when reading the file (default: utf8)'
        }
      },
      required: ['path']
    },
    annotations: {
      readOnlyHint: true,
      openWorldHint: false
    }
  });

• src/index.ts:137-158 (registration)

  Registers the 'read_file' tool with the MCP server using registerTool method.

  mcpServer.registerTool({
    name: 'read_file',
    description: 'Read the contents of a file',
    inputSchema: {
      type: 'object',
      properties: {
        path: {
          type: 'string',
          description: 'Path to the file to read'
        },
        encoding: {
          type: 'string',
          description: 'Encoding to use when reading the file (default: utf8)'
        }
      },
      required: ['path']
    },
    annotations: {
      readOnlyHint: true,
      openWorldHint: false
    }
  });

• src/file-system/file-system-manager.ts:53-59 (helper)

  Supporting method in FileSystemManager that reads file contents given path and encoding, directly corresponding to read_file tool logic.

  public async readFile(filePath: string, encoding: BufferEncoding = 'utf8'): Promise<string> {
    try {
      return await readFile(filePath, { encoding });
    } catch (error: any) {
      throw new Error(`Failed to read file ${filePath}: ${error.message}`);
    }
  }