@type t() :: %Inference.Trace{
  adapter: module() | nil,
  backend: atom() | nil,
  cost: map() | number() | nil,
  duration_ms: non_neg_integer() | nil,
  error: atom() | nil,
  finish_reason: atom() | String.t() | nil,
  metadata: map(),
  model: String.t() | nil,
  provider: atom() | nil,
  session: term(),
  usage: map() | nil
}