wehub-resource-sync
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46 lines
1.9 KiB
Python
46 lines
1.9 KiB
Python
"""Two error channels on lowlevel.Server: return is_error=True yourself, or raise MCPError."""
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from typing import Any
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import mcp_types as types
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from mcp.server.context import ServerRequestContext
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from mcp.server.lowlevel import Server
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from mcp.shared.exceptions import MCPError
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from stories._hosting import run_server_from_args
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_TOOLS = [
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types.Tool(name="divide", description="Divide a by b.", input_schema={"type": "object"}),
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types.Tool(name="restricted", description="Always rejects.", input_schema={"type": "object"}),
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]
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def build_server() -> Server[Any]:
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async def list_tools(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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return types.ListToolsResult(tools=_TOOLS)
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async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
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args = params.arguments or {}
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if params.name == "divide":
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a, b = float(args["a"]), float(args["b"])
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if b == 0:
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# Execution error: build the is_error result yourself.
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return types.CallToolResult(
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content=[types.TextContent(text="cannot divide by zero")],
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is_error=True,
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)
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return types.CallToolResult(content=[types.TextContent(text=str(a / b))])
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if params.name == "restricted":
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# Protocol error: raise MCPError; the dispatcher serialises it as a
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# JSON-RPC error response with this code/message/data.
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raise MCPError(code=types.INVALID_PARAMS, message="this tool is gated", data={"reason": "demo"})
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raise MCPError(code=types.INVALID_PARAMS, message=f"Unknown tool: {params.name}")
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return Server("error-handling-example", on_list_tools=list_tools, on_call_tool=call_tool)
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if __name__ == "__main__":
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run_server_from_args(build_server)
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