Hi team, is there a way to define part of prompt like business rule in a seperate text file, and have baml prompt template read in that file in runtime? I am taking over a project where it has quite a few business rules defined in a plain text file, which makes it easy for business stakeholders to review. Then in runtime, python read in that file as a variable and pass it onto langchain's PrompTemplate. I want to refactor the llm invoke part to make use of BAML, and couldn't figure out how to inject the business rule plain text prompt into BAML function.

You could pass in an argument to the BAML function with the result of the business logic, and then reference that in the prompt. Like,

function UseTool(user_message: string) -> (WeatherAPI | MyOtherAPI)[] {
  client "openai/gpt-5-mini"
  prompt #"
    Given a message, extract info.
    {# special macro to print the functions return type. #}
    {{ ctx.output_format }}

    {{ _.role('user') }}
    {{ user_message }}
  "#
}

Hey @Sanjan thanks for the reply. Got it working now