Base64 MCP Server

Instructions

Args:
    encoded: Base64编码的字符串

Returns:
    解码后的文本

Implementation Reference

• base64_server.py:39-67 (handler)

  The main handler function for the 'base64_decode_text' tool, decorated with @mcp.tool() for registration in the FastMCP server. It performs input cleaning, Base64 validation, decoding using base64.b64decode, and returns the result with error handling.

  @mcp.tool()
  def base64_decode_text(encoded: str) -> str:
      """将Base64编码解码为文本
  
      Args:
          encoded: Base64编码的字符串
  
      Returns:
          解码后的文本
      """
      try:
          # 清理输入，移除可能的前缀和空白
          encoded = encoded.strip()
          if "Base64编码结果:" in encoded:
              encoded = encoded.split("Base64编码结果:")[1].strip()
  
          # 验证是否为有效的Base64字符串
          if not all(
              c in "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
              for c in encoded
          ):
              return "错误: 输入包含非Base64字符"
  
          # 尝试解码
          decoded = base64.b64decode(encoded).decode("utf-8")
          return f"Base64解码结果: {decoded}"
      except Exception as e:
          return f"解码失败: {str(e)}"