parameter_shell_substitution - MadBomber/aia GitHub Wiki
When you combine prompt directives with prompt parameters and shell envar substitutions you can get some powerful compositional prompts.
Here is an example of a pure generic directive.
//[DIRECTIVE_NAME] [DIRECTIVE_PARAMS]
When the prompt runs, you will be asked to provide a value for each of the parameters. You could answer "shell" for the directive name and "calc 22/7" if you wanted a bad approximation of PI.
Try this prompt file:
//shell calc [FORMULA]
What does that number mean to you?