Common Bugs in Replit Agent-Generated Code

Replit Agent builds for Replit's specific environment without considering portability. Its database, secrets, and file system are unique to the platform. Cold starts are inherent to Replit's container model

The #1 bug is features that depend on Replit's environment — database calls that fail because Replit DB isn't available, secrets that are undefined because they were stored in Replit's secrets manager, and file operations that fail because the file system layout is different. Cold start issues cause the first request after idle to take 10-15 seconds. Database connections that drop and aren't re-established

Start by running your app through its complete user flow — sign up, use every feature, try edge cases like empty inputs and invalid data. Most Replit Agent bugs surface when you go off the happy path. Use your browser's developer tools to watch for console errors, failed network requests, and unhandled promise rejections. TypeScript's strict mode will catch many issues at compile time if it's not already enabled.

For async errors, wrap every server-side operation in try/catch blocks and return meaningful error messages. For state bugs, consider whether the state belongs in the URL, in a server component, or in client state — Replit Agent often defaults to client state when server state would be more appropriate. For data fetching issues, implement proper loading and error states for every data-dependent component.

The best way to prevent Replit Agent bugs from reaching production: enable TypeScript strict mode, add ESLint rules for common mistakes (no-floating-promises, exhaustive-deps), and write tests for critical user flows. Even basic smoke tests catch the majority of issues.