Show HN: PolyMCP – 轻松将 Python/TS 函数暴露为 MCP 工具
1 分•作者: justvugg•6 天前
我构建了 PolyMCP，目的是为了让将现有函数暴露为 MCP 工具变得轻而易举，无需重写逻辑或添加大量粘合代码。
目标：获取“普通”的 Python 或 TypeScript 函数，并立即让它们可供 MCP 客户端（Claude Desktop、代理、Ollama 等）使用。
Python 示例
```python
from polymcp.polymcp_toolkit import expose_tools
def greet(name: str) -> str:
"""打招呼。"""
return f"你好，{name}！"
def add(a: int, b: int) -> int:
"""加两个数。"""
return a + b
app = expose_tools([greet, add], title="我的 MCP 工具")
```
运行方式：
```bash
uvicorn server:app --reload
```
MCP 端点出现在：
* /mcp/list\_tools
* /mcp/invoke
TypeScript 示例
```typescript
import { z } from "zod";
import { tool, exposeTools } from "polymcp";
const uppercaseTool = tool({
name: "uppercase",
description: "将文本转换为大写",
inputSchema: z.object({ text: z.string() }),
function: async ({ text }) => text.toUpperCase(),
});
const app = exposeTools([uppercaseTool], { title: "文本工具" });
app.listen(3000);
```
更多“真实”示例（Python）
```python
import pandas as pd
from polymcp.polymcp_toolkit import expose_tools
def calculate_commissions(sales_data: list[dict]):
df = pd.DataFrame(sales_data)
df["commission"] = df["sales_amount"] * 0.05
return df.to_dict(orient="records")
app = expose_tools([calculate_commissions], title="业务工具")
```
您将获得
* 以最小的改动重用现有代码
* MCP 兼容（Claude Desktop、代理、Ollama 等）
* 支持 HTTP、stdio 和 WASM
* 自动输入验证
* 基本的生产特性（预算、重试、编辑、日志）
* 用于测试和监控的内置检查器
安装
* Python：pip install polymcp
* TypeScript：克隆仓库 → cd polymcp-ts → npm install → npm run build
仓库：
[https://github.com/poly-mcp/Polymcp](https://github.com/poly-mcp/Polymcp)
很好奇，如果这么容易，人们会首先暴露什么样的函数。
非常欢迎反馈。
查看原文
I built PolyMCP to make it trivial to expose existing functions as MCP tools, without rewriting logic or adding much glue code.<p>The goal: take “normal” Python or TypeScript functions and instantly make them usable by MCP clients (Claude Desktop, agents, Ollama, etc.).<p>Python example<p>from polymcp.polymcp_toolkit import expose_tools<p>def greet(name: str) -> str:
"""Say hello."""
return f"Hello, {name}!"<p>def add(a: int, b: int) -> int:
"""Add two numbers."""
return a + b<p>app = expose_tools([greet, add], title="My MCP Tools")<p>Run with:<p>uvicorn server:app --reload<p>MCP endpoints appear at:
• /mcp/list_tools
• /mcp/invoke<p>TypeScript example<p>import { z } from "zod";
import { tool, exposeTools } from "polymcp";<p>const uppercaseTool = tool({
name: "uppercase",
description: "Convert text to uppercase",
inputSchema: z.object({ text: z.string() }),
function: async ({ text }) => text.toUpperCase(),
});<p>const app = exposeTools([uppercaseTool], { title: "Text Tools" });
app.listen(3000);<p>More “real” example (Python)<p>import pandas as pd
from polymcp.polymcp_toolkit import expose_tools<p>def calculate_commissions(sales_data: list[dict]):
df = pd.DataFrame(sales_data)
df["commission"] = df["sales_amount"] * 0.05
return df.to_dict(orient="records")<p>app = expose_tools([calculate_commissions], title="Business Tools")<p>What you get
• Reuse existing code with minimal changes
• MCP-compatible (Claude Desktop, agents, Ollama, etc.)
• HTTP, stdio, and WASM support
• Automatic input validation
• Basic production features (budgets, retries, redaction, logs)
• Built-in inspector for testing and monitoring<p>Install
• Python: pip install polymcp
• TypeScript: clone repo → cd polymcp-ts → npm install → npm run build<p>Repo:
<a href="https://github.com/poly-mcp/Polymcp" rel="nofollow">https://github.com/poly-mcp/Polymcp</a><p>Curious what kind of function people would expose first if it was this easy.
Feedback very welcome.