Custom Python MCP Server

Guide for creating a custom Python MCP server for stock price retrieval

Custom Python MCP Server

Overview

The Custom Python MCP Server is a simple implementation of the Model Context Protocol (MCP) that provides stock price information using the yfinance library. This server can be used with PraisonAI agents to retrieve real-time stock prices.

Server Implementation

Below is the complete implementation of the custom Python MCP server:

Quick Start

1. Install Dependencies

   Install the required packages:

   pip install yfinance mcp
   
2. Save the Server Code

   Save the code above to a file named custom-python-server.py.

   import yfinance as yf
   from mcp.server.fastmcp import FastMCP
   
   mcp = FastMCP("stock_prices")
   
   @mcp.tool()
   async def get_stock_price(ticker: str) -> str:
       """Get the current stock price for a given ticker symbol.
       
       Args:
           ticker: Stock ticker symbol (e.g., AAPL, MSFT, GOOG)
           
       Returns:
           Current stock price as a string
       """
       if not ticker:
           return "No ticker provided"
       try:
           stock = yf.Ticker(ticker)
           info = stock.info
           current_price = info.get('currentPrice') or info.get('regularMarketPrice')
           if not current_price:
               return f"Could not retrieve price for {ticker}"
           return f"${current_price:.2f}"
           
       except Exception as e:
           return f"Error: {str(e)}"
   
   if __name__ == "__main__":
       mcp.run(transport='stdio')
   

Requirements

• Python 3.10 or higher
• yfinance package
• mcp package