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38 lines
1.0 KiB
Python
38 lines
1.0 KiB
Python
"""Tools primitive: register, list, call, structured output, annotations."""
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from typing import Literal
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from mcp_types import ToolAnnotations
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from pydantic import BaseModel
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from mcp.server.mcpserver import MCPServer
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from stories._hosting import run_server_from_args
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class CalcResult(BaseModel):
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op: str
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result: float
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def build_server() -> MCPServer:
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mcp = MCPServer("tools-example")
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@mcp.tool(
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title="Calculator",
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description="Apply an arithmetic operation to two numbers.",
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annotations=ToolAnnotations(read_only_hint=True, idempotent_hint=True),
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)
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def calc(op: Literal["add", "sub", "mul"], a: float, b: float) -> CalcResult:
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result = a + b if op == "add" else a - b if op == "sub" else a * b
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return CalcResult(op=op, result=result)
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@mcp.tool(description="Echo the input back as plain text.", structured_output=False)
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def echo(text: str) -> str:
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return text
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return mcp
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if __name__ == "__main__":
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run_server_from_args(build_server)
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