ElevenLabsWhat they did
The founder of StartupBar, posting in r/SaaS, wanted a promo video for the product. The poster shared the site's URL with Claude running Opus 5.5 at medium effort, added a few details, and dropped an ElevenLabs API key into a secrets folder. The request asked for bold stats, fast cuts, colours taken from the website's theme, and ElevenLabs for the voice-over, background music and sound effects. A commenter explained the usual recipe: Claude writes the animation with the Remotion video library and calls a text-to-speech service for audio. The poster said they used no extra MCP server or skill. After the first render they asked for a few changes and Claude produced the final cut.
How it went
The poster reports a finished motion-graphics video with narration, music and effects in under 45 minutes for a few dollars of usage, and posted it to the subreddit. Reactions were mixed. Some commenters were impressed, while the top-voted reply said it looked like a website template and would soon read as generic once everyone makes videos this way. Others noted the video's branding did not quite match the site.
Worth knowing
The harness was not named beyond Claude with Opus 5.5, but the job needs an agent that can run code and render video locally. Expect a template look unless you give it a stronger visual direction. Keep API keys out of the prompt itself; the poster put the key in a file the agent could read.