Cursor Introduces Legacy Code Mode for Two-Week-Old Code

Cursor announced a new Legacy Code Mode, designed to help developers identify code nobody remembers writing.

The editor automatically marks code as legacy when more than two weeks have passed since its last AI-assisted modification.

According to Cursor, two weeks represents the point where neither the developer nor the AI agent has enough context to safely explain why the code exists.

“We found developers were spending too much time trying to understand code generated earlier this month.”

When Legacy Code Mode detects such code, Cursor discourages direct modification and recommends the industry-standard alternative: creating a new service.

If developers still attempt to change the original implementation, Cursor displays a warning:

“This code appears to be working. Are you sure?”