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modelcontextprotocol--pytho…/examples/stories/reconnect/server_lowlevel.py
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chore: import upstream snapshot with attribution
2026-07-13 12:10:27 +08:00

49 lines
1.5 KiB
Python

"""A small modern server whose DiscoverResult a client persists for zero-RTT reconnect (lowlevel API)."""
from typing import Any
import mcp_types as types
from mcp.server.context import ServerRequestContext
from mcp.server.lowlevel import Server
from stories._hosting import run_server_from_args
ADD = types.Tool(
name="add",
description="Add two integers.",
input_schema={
"type": "object",
"properties": {"a": {"type": "integer"}, "b": {"type": "integer"}},
"required": ["a", "b"],
},
)
def build_server() -> Server[Any]:
async def list_tools(
ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
) -> types.ListToolsResult:
return types.ListToolsResult(tools=[ADD])
async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
assert params.arguments is not None
if params.name == "add":
total = int(params.arguments["a"]) + int(params.arguments["b"])
return types.CallToolResult(
content=[types.TextContent(text=str(total))],
structured_content={"result": total},
)
raise NotImplementedError
return Server(
"reconnect-example",
version="1.0.0",
instructions="Call add(a, b) to sum two integers.",
on_list_tools=list_tools,
on_call_tool=call_tool,
)
if __name__ == "__main__":
run_server_from_args(build_server)