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98 lines
2.5 KiB
Python
98 lines
2.5 KiB
Python
"""Example showing structured output with tools."""
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from typing import TypedDict
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from pydantic import BaseModel, Field
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from mcp.server.mcpserver import MCPServer
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mcp = MCPServer("Structured Output Example")
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# Using Pydantic models for rich structured data
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class WeatherData(BaseModel):
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"""Weather information structure."""
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temperature: float = Field(description="Temperature in Celsius")
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humidity: float = Field(description="Humidity percentage")
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condition: str
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wind_speed: float
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@mcp.tool()
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def get_weather(city: str) -> WeatherData:
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"""Get weather for a city - returns structured data."""
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# Simulated weather data
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return WeatherData(
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temperature=22.5,
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humidity=45.0,
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condition="sunny",
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wind_speed=5.2,
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)
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# Using TypedDict for simpler structures
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class LocationInfo(TypedDict):
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latitude: float
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longitude: float
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name: str
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@mcp.tool()
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def get_location(address: str) -> LocationInfo:
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"""Get location coordinates"""
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return LocationInfo(latitude=51.5074, longitude=-0.1278, name="London, UK")
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# Using dict[str, Any] for flexible schemas
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@mcp.tool()
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def get_statistics(data_type: str) -> dict[str, float]:
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"""Get various statistics"""
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return {"mean": 42.5, "median": 40.0, "std_dev": 5.2}
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# Ordinary classes with type hints work for structured output
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class UserProfile:
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name: str
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age: int
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email: str | None = None
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def __init__(self, name: str, age: int, email: str | None = None):
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self.name = name
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self.age = age
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self.email = email
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@mcp.tool()
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def get_user(user_id: str) -> UserProfile:
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"""Get user profile - returns structured data"""
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return UserProfile(name="Alice", age=30, email="alice@example.com")
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# Classes WITHOUT type hints cannot be used for structured output
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class UntypedConfig:
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def __init__(self, setting1, setting2): # type: ignore[reportMissingParameterType]
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self.setting1 = setting1
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self.setting2 = setting2
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@mcp.tool()
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def get_config() -> UntypedConfig:
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"""This returns unstructured output - no schema generated"""
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return UntypedConfig("value1", "value2")
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# Lists and other types are wrapped automatically
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@mcp.tool()
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def list_cities() -> list[str]:
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"""Get a list of cities"""
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return ["London", "Paris", "Tokyo"]
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# Returns: {"result": ["London", "Paris", "Tokyo"]}
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@mcp.tool()
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def get_temperature(city: str) -> float:
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"""Get temperature as a simple float"""
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return 22.5
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# Returns: {"result": 22.5}
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