Prompts And Parsers

Prompts and parsers expose focused constructors and tagged results. Internal composition support is intentionally secondary to direct prompt/parser APIs.

Prompt templates use the safe :simple format only, with {variable} interpolation. BeamWeaver does not add Mustache, Jinja2, EEx, or Python template aliases.

Prompts can be persisted as declarative BeamWeaver specs:

prompt =
  BeamWeaver.Prompt.chat([
    BeamWeaver.Prompt.message(:system, "Use {style} answers."),
    BeamWeaver.Prompt.message(:user, "{input}")
  ])
  |> BeamWeaver.Prompt.partial(%{style: "short"})

:ok = BeamWeaver.Prompt.save(prompt, "priv/prompts/support.yaml")
{:ok, loaded} = BeamWeaver.Prompt.load("priv/prompts/support.yaml")

The durable format is JSON-compatible BeamWeaver data, not a serialized Elixir module or Python class reference. Loader configs must declare a BeamWeaver "type" and use native keys such as "partials".

Plain template files can be loaded with Prompt.from_file/2:

{:ok, prompt} = BeamWeaver.Prompt.from_file("priv/prompts/answer.txt")

Output parsers include string, JSON, list, CSV/markdown-list, XML, OpenAI tools, OpenAI functions, and schema parsers. Failures return tagged %BeamWeaver.Core.Error{} values.

Example:

• examples/prompt_parser_pipeline.exs