How long does it take to generate a reaction video?

About a minute end-to-end with AgentMedia: one CLI command generates the actor, video, and captions, and can auto-publish to TikTok, Instagram, and YouTube.

Do I need actors or filming equipment?

No. AgentMedia generates a realistic AI actor from a text description — no photo, camera, or studio required. Persist a character to keep the same face across a whole campaign.

How to Make a Reaction Video for YouTube Shorts with AI (2026)

A good reaction video for YouTube Shorts used to mean briefing a creator, waiting a week, and hoping the delivery matched the brief. With generated UGC you describe the actor, paste the script, and have a publishable video in about a minute — then iterate on hooks as fast as you can type them.

AgentMedia generates realistic 9:16 UGC videos — actor, script delivery, captions — from a single command, and auto-publishes to your channels. It runs from a web app, a CLI, a REST API, SDKs, or directly inside AI agents via MCP.

What a high-performing reaction video needs

Genuine surprise reads in micro-expressions — let the pause breathe
React to one specific thing, not the product in general
Follow the reaction with the reason in one sentence
YouTube Shorts native format: 9:16 — generated output matches without cropping

Example script you can copy

"No. No way. It actually did the whole thing while I was on a call"

— casual selfie framing, natural light, talking directly to camera

Step-by-step with AgentMedia

1. Install the CLI and log in

npm install -g agent-media-cli && agent-media login

2. Describe the actor and script

agent-media selfie \
  --description "25yo woman, warm smile, natural look" \
  --script "No. No way. It actually did the whole thing while I was on a call" \
  --scene-action "close selfie framing, eyebrows up, glancing between camera and off-screen product" \
  --duration 10

3. Generate and auto-publish - captions optional

agent-media publish --channels tiktok,instagram,youtube

Frequently asked questions

How to Make a Reaction Video for YouTube Shorts with AI (2026)?: A good reaction video for YouTube Shorts used to mean briefing a creator, waiting a week, and hoping the delivery matched the brief. With generated UGC you describe the actor, paste the script, and have a publishable video in about a minute — then iterate on hooks as fast as you can type them.
What a high-performing reaction video needs?: Genuine surprise reads in micro-expressions — let the pause breathe. React to one specific thing, not the product in general. Follow the reaction with the reason in one sentence.
How long does it take to generate a reaction video?: About a minute end-to-end with AgentMedia: one CLI command generates the actor, video, and captions, and can auto-publish to TikTok, Instagram, and YouTube.
Do I need actors or filming equipment?: No. AgentMedia generates a realistic AI actor from a text description — no photo, camera, or studio required. Persist a character to keep the same face across a whole campaign.

Generate your first UGC video in 60 seconds

One CLI command — script, actor, video, captions, and auto-publish to TikTok, Instagram, and YouTube.

Get started free