The extraction task definition: a plain-language description of what to extract, plus few-shot examples showing the expected output.

There is no schema DSL and no fine-tuned model — the template is rendered into a few-shot prompt by LangExtract.Prompt.Builder, and the examples are what teach the model the class vocabulary, span granularity, attributes, and output format. See LangExtract.Prompt.ExampleData for what a good example pins down.

%Template{
  description: "Extract medical conditions and medications.",
  examples: [
    %ExampleData{
      text: "Patient was diagnosed with diabetes and prescribed metformin.",
      extractions: [
        %Extraction{class: "condition", text: "diabetes"},
        %Extraction{class: "medication", text: "metformin"}
      ]
    }
  ]
}