MCP协议解析：大模型与外部工具交互的统一层是如何设计的

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "query_database",
    "arguments": {"sql": "SELECT * FROM orders WHERE status='pending'"}
  }
}

{
  "name": "query_database",
  "description": "执行只读SQL查询，仅支持SELECT语句",
  "inputSchema": {
    "type": "object",
    "properties": {
      "sql": {"type": "string", "maxLength": 1000}
    },
    "required": ["sql"]
  }
}

# MCP Server端工具定义（带上下文约束）
@mcp.tool(
    description="仅在用户明确要求发送邮件时调用，禁止主动发送",
    constraints={
        "recipient": {"required": True, "format": "email"},
        "content": {"max_length": 10000}
    },
    examples=[
        {"input": "帮我把这份报告发给zhang@company.com", "output": "邮件已发送"}
    ]
)
def send_email(recipient: str, content: str) -> dict:
    # 实际发送逻辑
    return {"status": "sent", "message_id": generate_id()}

# 企业内部MCP Server统一接入层
mcp_server = MCPServer(
    tools=[get_user_profile, query_inventory, create_ticket],
    auth=internal_iam_check,      # 复用公司统一权限体系
    rate_limit=100,               # 每秒钟最大请求数
    timeout=5,                    # 单次调用超时兜底
    retry_policy={"max_attempts": 3, "backoff": "exponential"}
)
mcp_server.run(port=8080)

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: mcp-server-hpa
spec:
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70