They knew every detail of the old code. Cursor rewrote it in 2 days with less technical debt, they happily archived the old repo, and the experience pushed them to retrain toward AI evals.
Result Old repo happily archived
“I came to this realization after I used Cursor to rewrite a 10-year old codebase (I knew every bit of the details.) and it was done in 2 days.”
Spotted: found in the wild. Details are as reported by the source above and have not been independently verified.
Used Cursor to rewrite a 10-year-old codebase they knew inside out.
It was done in 2 days. The result was better, with less technical debt, and they were happy to archive the old repo. The experience pushed them to retrain toward AI training, evals and neuroscience.
We're rewriting [project] from scratch in [language or framework]. First read the whole existing codebase and write a short map of its features, data flows and edge cases. Then propose the new structure. Rebuild it module by module, keeping behaviour identical, with tests that compare old and new outputs, and list anything you deliberately changed.
A starting prompt written by Agents in the Wild. Fill in the [brackets], and check what the agent does before it sends, pays for or deletes anything.