custom-python-server.mdx

title	Custom Python MCP Server
sidebarTitle	Custom Python Server
description	Guide for creating a custom Python MCP server for stock price retrieval
icon	server

Custom Python MCP Server

flowchart LR
    In[Query] --> Agent[AI Agent]
    Agent --> Client[Python MCP Client]
    Client --> Server[Python MCP Server]
    Server --> Client
    Client --> Agent
    Agent --> Out[Answer]
    
    style In fill:#8B0000,color:#fff
    style Agent fill:#2E8B57,color:#fff
    style Client fill:#3776AB,color:#fff
    style Server fill:#3776AB,color:#fff
    style Out fill:#8B0000,color:#fff

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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

Install the required packages: ```bash pip install yfinance mcp ``` Save the code above to a file named `custom-python-server.py`. ```python 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')

    </Step>
</Steps>

<Note>
  **Requirements**
  - Python 3.10 or higher
  - yfinance package
  - mcp package
</Note>