IdeaAMBIG is a benchmark that evaluates the implementation‑critical gaps in research‑idea specifications by measuring whether methodological descriptions provide sufficient detail for a competent implementer or coding agent to reproduce the intended method without unsupported assumptions. The authors construct evidence‑grounded specifications to assess codification readiness and identify missing information that hinders faithful implementation. The study highlights how even novel and coherent ideas can fail to translate into code due to underspecified methods.