Build and publish a simple web tool from one prompt
A developer gave Cursor a detailed spec written with Claude's help; it built and published a dollar-and-peso tip calculator, which they say went live in eight minutes.
Done with Cursor
What they did
The author asked Claude to draft instructions for building the tool. They then edited it to ask for US dollars and Mexican pesos, exact brand colors and fonts, and checks on what users type. It also said the tool must never show an error number and must not add features beyond the list. They pasted this into Cursor. It also told the agent to save the work, create a public project on GitHub and publish it as a free web page there.
How it went
They say the site was live eight minutes after the first ask, from one save with no corrections. A later review by Claude of the 424-line file found two problems. It accepted 1.5 people, and screen readers for blind users got no updates. Both were fixed in a second save with two lines changed.
Worth knowing
The author credits the speed to the detailed instructions, not the tool. Every design choice was made before Cursor started, and the line forbidding extra features did a lot of the work.
Try it yourself with Cursor
Build a [small app, e.g. tip calculator] as a single index.html with inline CSS and JS, no frameworks. Requirements: [inputs, outputs, validation rules, never show NaN, use textContent]. Style: [your colors and fonts]. Add a short README. Do not add features beyond this list. Then show me the plan for git init, creating a public GitHub repo named [repo name] with gh, pushing and enabling GitHub Pages. Wait for my approval before creating or publishing anything, then give me the repo and Pages links.
Swap the highlighted [parts] for your own details.
Source: DEV Community · Earl Grey · Oct 15, 2026
Written with AI assistance from the original post and checked against our editorial guidelines. Results are as reported by the source, not independently verified.
