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Prompty

GenAIScript supports running .prompty files as scripts (with some limitations) or importing them in a script.

What is prompty?

Prompty is a markdown-ish file format to store a parameterized prompts along with model information.

basic.prompty
---
name: Basic Prompt
description: A basic prompt that uses the chat API to answer questions
model:
api: chat
configuration:
type: azure_openai
azure_deployment: gpt-4o
parameters:
max_tokens: 128
temperature: 0.2
inputs:
question:
type: string
sample:
"question": "Who is the most famous person in the world?"
---
system:
You are an AI assistant who helps people find information.
As the assistant, you answer questions briefly, succinctly.
user:
{{question}}
{{hint}}

There are two ways to leverage prompty files with GenAIScript:

  • run them directly through GenAIScript
  • import them in a script using importTemplate

Running .prompty with GenAIScript

You can run a .prompty file from the cli or Visual Studio Code as any other .genai.mjs script.

GenAIScript will convert the .prompty content as a script and execute it. It supports most of the front matter options but mostly ignores the model configuration section.

This is what the basic.prompty file compiles to:

basic.prompty.genai.mts
script({
model: "azure:gpt-4o",
title: "Basic Prompt",
description: "A basic prompt that uses the chat API to answer questions",
parameters: {
question: {
type: "string",
default: "Who is the most famous person in the world?",
},
},
temperature: 0.2,
maxTokens: 128,
})
writeTesxt(
`You are an AI assistant who helps people find information.
As the assistant, you answer questions briefly, succinctly.`,
{ role: "system" }
)
$`{{question}}
{{hint}}`.jinja(env.vars)

Importing .prompty

You can also import and render a .prompty file at runtime while generating the prompt using importTemplate.

importTemplate("basic.prompty", {
question: "what is the capital of france?",
hint: "starts with p",
})

In this scenario, the .prompty file is not executed as a script but imported as a template. The importTemplate function will render the template with the provided parameters.

Supported features

  • name, description, temperature, max_tokens, top_p, …0
  • inputs converted to parameters
  • sample value populates the parameters default section
  • outputs converted to responseSchema
  • Jinja2 template engine

Limitations

  • model configuration uses GenAIScript .env file (see configuration).
  • images are not yet supported

Extensions

Extra fields that genaiscript use:

  • files to specify one or many files to populate env.files
  • tests to specify one or many tests