Sizzle is an agent inside Hyperagent that makes a product demo video from a feature a team has just shipped. It reads pull requests, opens the product in its own browser, captures the interface structure and styling from the front-end code, rebuilds that UI as a scene it can animate, and renders a finished video. Hyperagent built it after its own demos kept falling behind the features it shipped. The video is generated from that rebuilt interface, so a note on pacing, which feature should lead, or a switch from a clean product shot to a cut with a speaker changes the output without a new screen recording or an editing timeline. Teammates and other agents on Hyperagent can ask Sizzle for a new asset in one prompt. Finished cuts come out in 16:9, 9:16, or 1:1, and Hyperagent renders them with Hyperframes. Hyperagent, the San Francisco agent platform founded by Howie Liu, is covering $1,000 in Hyperagent credits for each of 25 startups that want to try Sizzle. Alongside the launch, the company posted demo concepts Sizzle made for a set of YC companies.