mcpison - MCP to ISON Transport Proxy

English

mcpison is a transparent MCP (Model Context Protocol) transport interceptor. It converts JSON responses from MCP Servers into the lightweight ISON format in real-time, reducing LLM token consumption without modifying the original MCP Server code.

Installation

npm install -g mcpison

Usage 1: Web Management UI

A visual interface for managing proxy configurations. Start it with:

mcpison-ui
# Open http://localhost:4000

Use a custom port:

mcpison-ui --port 8080

Paste your existing mcpServers JSON block into the Batch Import tab. It will:

Detect each server's transport type (HTTP/SSE or stdio)
Register remote HTTP endpoints as local proxy routes
Wrap local stdio commands with mcpison
Output the complete updated configuration

Individual tabs for adding HTTP/SSE or stdio servers manually are also available.

Usage 2: Remote HTTP/SSE API Proxy (Added in v1.1.0)

For remote MCP Servers that expose a URL, mcpison acts as a local reverse proxy.

Option A: Proxy a Single Endpoint

mcpison --proxy-url https://mcp.api-inference.modelscope.net/123456/mcp --port 3000

Update your MCP client config:

"mcpServers": {
  "my-remote-server": {
    "type": "sse",
    "url": "http://localhost:3000/sse"
  }
}

Option B: Proxy Multiple Endpoints on One Port (Added in v1.1.x)

Create a mcp-routes.json file:

{
  "/modelscope": "https://mcp.api-inference.modelscope.net/123456/mcp",
  "/weather": "https://weather-mcp.example.com/api"
}

Start with the config:

mcpison --config mcp-routes.json --port 3000

"mcpServers": {
  "my-modelscope": { "type": "sse", "url": "http://localhost:3000/modelscope/sse" },
  "my-weather":    { "type": "sse", "url": "http://localhost:3000/weather/sse" }
}

Usage 3: Local stdio Proxy

For MCP Servers running locally via stdio, prepend mcpison to your command in the MCP client configuration:

"mcpServers": {
  "my-local-server": {
    "command": "mcpison",
    "args": ["python", "/path/to/sql-server.py"]
  }
}

Add --debug as the first item in args to log byte savings: "args": ["--debug", "python", "/path/to/sql-server.py"]

Regardless of which mode you use, all client traffic flows through mcpison. It compresses JSON in memory and returns ISON transparently, without modifying the original server code.

中文

mcpison 是一个透明的 MCP (Model Context Protocol) 传输层拦截代理。它可以将 MCP Server 返回的 JSON 数据实时转换为轻量级的 ISON 格式，降低大语言模型的 Token 消耗，无需修改任何原本的 MCP Server 代码。

安装

npm install -g mcpison

用法 1：Web 管理界面

提供可视化界面管理代理配置。启动方式：

mcpison-ui
# 然后打开 http://localhost:4000

自定义端口：

mcpison-ui --port 8080

在 批量导入 标签页中粘贴你的 mcpServers JSON，系统会自动：

识别每个服务器的通信类型（HTTP/SSE 或 stdio）
将远程 HTTP 节点注册为本地代理路由
为本地 stdio 节点添加 mcpison 包装
输出可直接使用的完整新配置

界面上也提供 HTTP/SSE 和 stdio 的独立手动添加面板。

用法 2：远程 HTTP/SSE API 代理 (V1.1.0 新增)

对于只提供 URL 的远程 MCP Server，mcpison 可以作为本地反向代理。

方式 A：单独代理一个节点

mcpison --proxy-url https://mcp.api-inference.modelscope.net/123456/mcp --port 3000

"mcpServers": {
  "my-remote-server": {
    "type": "sse",
    "url": "http://localhost:3000/sse"
  }
}

方式 B：单端口代理多个节点 (V1.1.x 新增)

创建 mcp-routes.json：

{
  "/modelscope": "https://mcp.api-inference.modelscope.net/123456/mcp",
  "/weather": "https://weather-mcp.example.com/api"
}

mcpison --config mcp-routes.json --port 3000

"mcpServers": {
  "my-modelscope": { "type": "sse", "url": "http://localhost:3000/modelscope/sse" },
  "my-weather":    { "type": "sse", "url": "http://localhost:3000/weather/sse" }
}

用法 3：本地命令行工具 (stdio)

对于运行在本地、使用 stdio 通信的 MCP Server，在配置文件中把 mcpison 前置到命令前：

"mcpServers": {
  "my-local-server": {
    "command": "mcpison",
    "args": ["python", "/path/to/sql-server.py"]
  }
}

在 args 首位加上 --debug 可在调试日志中查看节省的字节数。

不论是哪种方式，客户端所有流量都通过 mcpison 转发；它在内存中将 JSON 转换为 ISON 后返回给客户端，原 Server 代码无需任何改动。

MCP Servers