Function fail

tests/server/test_streamable_http_modern.py:238–239

()

    `JSONRPCError` whose `error` carries the same code, message, and data."""

    async def fail() -> dict[str, Any]:
        raise MCPError(code=METHOD_NOT_FOUND, message="nope", data="x")

    reply = await _to_jsonrpc_response("rid", fail())
    assert isinstance(reply, JSONRPCError)