[
  {"op": "name", "name": ""},
  {"op": "doc", "text": "empty name — should refuse"},
  {"op": "source", "role": "price", "kind": "F64"},
  {"op": "add", "type": "SMA", "name": "fast", "bind": {"length": {"I64": 3}}},
  {"op": "feed", "role": "price", "into": ["fast.series"]},
  {"op": "add", "type": "Bias", "name": "bias", "bind": {"scale": {"F64": 0.5}}},
  {"op": "connect", "from": "fast.value", "to": "bias.signal"},
  {"op": "expose", "from": "bias.bias", "as": "bias"}
]