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MCP provider wrapping the Niutrans translation API

Project description

MCP 翻译服务

基于小牛翻译(NiuTrans)API 的 MCP Provider,提供文字翻译工具和语种目录资源,方便在 Cursor/mcp-cli 等客户端中引用。

快速开始

使用 uv 安装并启动发布版

uv tool install mcp-translation-text

环境变量

计费说明

本服务使用小牛翻译的文本翻译 API,计费规则如下:

项目 说明
计费单位 2000 字符 = 1 积分
免费额度 每天免费赠送 100 积分
每日可翻译 20 万字符(免费额度)

💡 提示:每日免费赠送的 100 积分足够日常使用,超出部分可在小牛翻译开放平台充值购买。

MCP 客户端配置示例

若通过 uv tool install 安装,可在 mcp.json 中写:

{
  "mcpServers": {
    "translation": {
      "type": "stdio",
      "command": "uv",
      "args": [
        "tool",
        "run",
        "mcp-translation-text"
      ],
      "env": {
        "NIUTRANS_API_KEY": "${env.NIUTRANS_API_KEY}"
      }
    }
  }
}

启动 Cursor 后执行 ListTools 即可看到 translate_text,同时支持 ListResources 读取 language://catalog

可用功能

工具:translate_text

  • 参数
    • text:待翻译内容。
    • source:源语言代码或别名(会通过本地映射表规范化)。
    • target:目标语言代码或别名。
  • 返回
    {
      "source": "zh",
      "target": "en",
      "original_text": "你好",
      "translated_text": "Hello",
      "raw": { ... 小牛原始响应 ... }
    }
    

资源:language://catalog

提供所有可用语种及别名,示例如下:

{
  "total": 455,
  "languages": [
    {"code": "zh", "zh": "中文(简体)", "en": "Chinese (Simplified)"},
    {"code": "en", "zh": "英语", "en": "English"}
    // ... 其余省略 ...
  ],
  "aliases": {
    "zhongwenjianti": "zh",
    "english": "en"
    // ... 其余省略 ...
  }
}

推荐在客户端的 LLM 中先读取该资源,完成语种描述到代码的映射后,再调用 translate_text

调试与常见问题

  • 缺少 API Key:启动时报 缺少环境变量 NIUTRANS_API_KEY,请确认已在 .env 或系统环境中设置。
  • 语种不支持translate_text 会校验语种代码/别名,若报错请检查是否使用了 language://catalog 中列出的值。
  • 路径或依赖问题:脚本依赖 uv,请先安装 pip install uv 或参考 uv 文档
  • 命令名称:通过 PyPI 安装后,可直接运行 mcp-translation-text;若 global PATH 中找不到,记得激活虚拟环境或使用 python -m mcp_translation_text
  • 发布/升级包
    python -m build
    twine upload dist/*
    

目录结构(关键文件)

E:\MCP
├── pyproject.toml
├── server.py                # 入口包装,确保 python server.py 可运行
├── src/
│   └── translation_server.py
├── scripts/
│   ├── start.ps1
│   └── start.sh
├── .env.example
├── LICENSE
└── README.md

发布后,用户只需设置 NiuTrans API Key,即可通过 mcp-translation-text 直接加载该 Provider。

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