How to Build an AI Agent That Writes Code (Using MCP in 2026)

#ai #python #mcp #agents

How to Build an AI Agent That Writes Code

In 2026, AI agents are the hottest topic in software development. Here's how to build one that writes code.

What is an AI Coding Agent?

An AI coding agent autonomously understands requirements, writes code, tests it, and fixes bugs. The key technology is the Model Context Protocol (MCP).

The Architecture

User Request -> Orchestrator Agent -> Code Writer Agent -> Code Reviewer Agent
                                      |                    |
                                  File System MCP     Code Analysis MCP

Building with MCP

from mcp import Agent, Tool

class CodeWriter(Agent):
    def __init__(self):
        super().__init__(name="code-writer")
        self.add_tool(Tool(name="write_file", fn=self.write_file))

    async def run(self, task: str):
        plan = await self.plan(task)
        for step in plan:
            await step.execute()
        return "Code generated!"