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YouTube kept rewinding my videos. GPT found the bug in its code.

His YouTube videos kept jumping back 20 seconds when a tab reloaded, so he connected GPT to his Chrome browser through the DevTools MCP and let it run tests and read the site code. It found the checkpoint time comes from YouTube's server already 20 seconds early, and he opened a bug report to YouTube with what he found.

How it works

  1. Reproduces the bug and measures a 20 second rewind on each reload
  2. Asks the AI how to track video seeks and adds a debugger script
  3. Connects GPT to Chrome through the DevTools MCP and lets it run tests, read the code and check network traffic
  4. It finds the server sends a checkpoint 20 seconds early
  5. He opens a bug report to YouTube

Why it’s worth knowing

He handed the agent the keys to his own browser and let it debug a site he does not work for, one of the biggest sites in the world.

Where it’s from

Summarized from a public post on blog.thezilber.com. See the original ↗

Upgraded prompt

A ready-to-use prompt for this idea, built from research on what makes AI agents do the job right: who the AI should be, the exact steps, and a check to make sure it was done the way you wanted.

1Who the AI should be
2The prompt, with the steps
3The check when it’s done
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