01What HeyGen CLI Is and How It Works

HeyGen CLI is a command line tool that turns written text into professional looking videos with a realistic AI human avatar. You type one command, and the video gets made automatically. No video editors, cameras, or humans are needed.

Imagine an AI agent writes a report for you every morning. Instead of a boring wall of text, a friendly AI avatar appears on your screen and talks to you like a news presenter. That is what HeyGen CLI does.

It takes a script, assigns it to an AI avatar with a face, voice, and matching lip movements, then packages the finished video for you.

The process runs through one command in your terminal or inside an AI coding tool like Claude Code. All you need is a HeyGen account, API credits, Node.js installed, and a terminal. The whole workflow is like a factory with three rooms: the script room, the avatar room, and the delivery room.

02Key Features of HeyGen CLI

  • AI avatar generation: HeyGen creates realistic human avatars with matching voice and lip sync.
  • Full video editing: The output is not raw avatar footage. It is a fully edited video with animations and cuts.
  • CLI and AI agent support: You can run commands in a terminal or connect HeyGen to AI agents like Claude Code, OpenClaw, and Hermes.
  • Scheduled tasks: You can set up automated video generation with your AI agent on a schedule.
  • Custom avatars: If you build a custom avatar on HeyGen, you can retrieve its ID and use it in your CLI commands.
  • Voice ID selection: You can pick a specific voice ID for your avatar videos.

The tool also lets you generate videos from a simple topic prompt. Just give it a subject, and it creates a full explainer video with no extra effort.

03How to Set Up HeyGen CLI

  1. Create a HeyGen account and go to the API section to generate a new API key. Choose the option for AI agents if you want to code with your CLI.
  2. Top up your account with API credits. In the episode, Julian added $10 to test the tool.
  3. Install Node.js on your computer if you do not have it already.
  4. Open a terminal or launch the Claude Code desktop app.
  5. Create a new folder for your project, such as "HeyGen CLI", and open it in Claude Code.
  6. Give the HeyGen documentation and your API key to the AI agent. Tell it to use the key to generate videos with HeyGen.
  7. Trust the workspace in Claude Code so the agent can execute commands.

Once set up, you can start sending prompts to the video agent. The AI agent handles the rest, from writing the script to delivering the final video.

04Using HeyGen CLI with Claude Code

In the episode, Julian tested HeyGen CLI inside Claude Code's new desktop app. He started a new session, opened a folder called "HeyGen CLI", and pasted the HeyGen documentation and his API key into the chat. He told the agent to explain how to use AI for AI SEO.

The agent read the documentation and asked what the video should be about. Julian replied with a simple explainer topic. Then the agent began generating the video.

Because the account had no credits, Julian had to top up $10 in the billing section of his HeyGen settings before the generation could proceed.

After the top-up, the agent generated a full 42-second video. The video was nicely animated and edited, with the avatar even wearing a watch. Julian could see the video link on HeyGen and download it directly.

You can also use the CLI directly in a terminal if you prefer. Commands let you retrieve all avatars, get a voice ID, plug in a script, and check the status of your video generation. The process is the same, but Claude Code explains everything in plain English, which makes it easier for non-coders.

05Results and Costs from the Episode

Julian generated two videos during the test. The first was a 42-second explainer about using AI for AI SEO. The second used a custom avatar and voice ID he selected from his HeyGen account.

Both videos were fully edited and looked professional, not like raw avatar footage.

The total cost for the two videos was $1.67. That is about $0.84 per video, which is much cheaper than hiring a video editor. Julian noted that the results were far easier and more powerful than he expected, especially the automatic editing.

He also showed that you can check the status of a video in the terminal. It showed "processing" at first, then "completed" after a couple of minutes. Once done, you get a video URL to view and download.

The tool works with AI agents like Claude Code, OpenClaw, and Hermes. You can also set up scheduled tasks to run automatically, making it possible to create avatar videos on a regular basis without manual work.

06Tips, Limits, and Mistakes to Avoid

  • Top up credits before generating: Julian hit an error because the account had no credits. Add a payment method and top up in the billing section first.
  • Choose the right API key type: When creating a new API key, pick the AI agents option if you plan to use it with a CLI or AI coding tool.
  • Use Claude Code for simplicity: Julian does not like using terminals directly. Claude Code's desktop app makes the process easier because it reads the docs and explains everything in plain English.
  • Wait for processing: Video generation takes a couple of minutes. Check the status in the terminal and come back later instead of refreshing constantly.
  • Use custom avatars and voices: If you build a custom avatar on HeyGen, retrieve its ID and your voice ID to get consistent results.
  • Automate with scheduled tasks: You can set up your AI agent to generate videos on a schedule, but this requires additional configuration.

Avoid sharing your API key publicly. Julian gave his key to Claude Code but said he would delete it after the test.

07Who HeyGen CLI Is For and Why It Matters

HeyGen CLI is for anyone who wants to create professional AI avatar videos without hiring a video editor. It is especially useful for business owners, content creators, and marketers who need regular video updates. Julian, who says he does not code, was able to use it with Claude Code in minutes.

This tool matters because it removes the need for expensive video editors and complex editing software. A video agent can turn written content into a polished video automatically. You just provide a topic, and the system handles the script, avatar, voice, and editing.

For example, an AI agent that writes daily reports can use HeyGen CLI to present those reports as a friendly news-style video. This makes information easier to consume and more engaging. The low cost, around $0.84 per video, makes it accessible to small businesses and solo creators.

The integration with AI agents like Claude Code, OpenClaw, and Hermes means you can automate the entire production pipeline. This is a significant shift in how video content can be produced at scale.