MCPクライアント

from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStdio
from pydantic_ai.models.google import GoogleModel
 
# Python 製の MCP サーバー (URL を fetch するシンプルなもの)
server = MCPServerStdio('uvx', args=['mcp-server-fetch'])
 
agent = Agent(
    GoogleModel('gemini-3-flash-preview'),
    toolsets=[server],
    instructions='ユーザーの URL を MCP の fetch ツールで取得し、要約してください。',
)
 
async def main():
    async with agent:
        result = await agent.run(
            'https://example.com/ の見出しを取得して 3 行で要約'
        )
        print(result.output)
 
# import asyncio; asyncio.run(main())

from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP
from pydantic_ai.models.google import GoogleModel
 
# 社内に立てた MCP サーバー (例)
server = MCPServerStreamableHTTP('http://localhost:8000/mcp')
 
agent = Agent(
    GoogleModel('gemini-3-flash-preview'),
    toolsets=[server],
)
 
async def main():
    async with agent:
        result = await agent.run('社内 ID 12345 の状態を教えて')
        print(result.output)

from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStdio
from pydantic_ai.models.google import GoogleModel
 
fs = MCPServerStdio('npx', args=['-y', '@modelcontextprotocol/server-filesystem', '/tmp/work'], tool_prefix='fs')
git = MCPServerStdio('uvx', args=['mcp-server-git', '--repository', '/tmp/work'], tool_prefix='git')
 
agent = Agent(
    GoogleModel('gemini-3-flash-preview'),
    toolsets=[fs, git],
    instructions='ファイル操作と git 操作を両方使って質問に答えてください。',
)
 
async def main():
    async with agent:
        result = await agent.run('/tmp/work の README.md を読んで、最終更新コミットを確認して')
        print(result.output)

{
  "mcpServers": {
    "fs": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/tmp/work"]
    },
    "git": {
      "command": "uvx",
      "args": ["mcp-server-git", "--repository", "/tmp/work"]
    }
  }
}

from pydantic_ai.mcp import load_mcp_servers
 
servers = load_mcp_servers('mcp_config.json')
agent = Agent('google-gla:gemini-3-flash-preview', toolsets=servers)