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Marvin

A Python library that uses AI to pull tidy, structured information out of messy text and run simple agent workflows.

New this week

What it does

Marvin helps programmers hand work to AI models in a few lines of code. It can extract facts from text, sort text into categories, convert loose descriptions into neat data, and generate new data.

For bigger jobs, developers describe tasks, assign AI agents to them, and link tasks together into a thread.

It uses OpenAI by default and supports other providers, so you need an API key from your chosen AI service.

Who it's for

Python developers who want AI to handle data extraction and small automated tasks.

Can I use it without coding?

Developers only. It is a Python library used in code. New to this? Start here.

Can I run it?

Cost
Free, but needs an AI accountThe software is free, but it uses an online AI service (like OpenAI or Anthropic), which usually charges for use.
Computer
An ordinary computer is fine
Privacy
Sends what you give it to an online service
API key
Needed. An API key is a password-like code from an online AI service. What's that?

Try it

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (Apache-2.0): Permissive: free to use, change and share, including for business.
  • Keep your API key private. Never paste it into websites or share it, and set a spending limit with the AI service.
  • What you type or upload is sent to an online service. Avoid sharing private or sensitive information.
  • More on staying safe

Where people are talking about it