Is it safe to paste an API key into Cursor's chat?
Why chat pastes are risky
Anything you paste into a chat box leaves your machine and is handled by the service, so treat it as shared. Even when a provider states that it does not train on your data, the key may still be logged, copied into a history, or visible to others who see your screen. The safe default is to keep credentials out of prompts entirely.
- Replace real keys with placeholder names in examples
- Keep secrets in a .env file listed in .gitignore
- Use a password manager or a secrets service for production keys
Storing keys properly
Load secrets from environment variables at runtime so your code reads them without containing them. Make sure your project's ignore file excludes the environment file before your first commit. Check the official privacy documentation for how the editor handles file access.
What to do if a key leaked
Revoke the key in the provider's dashboard right away and create a new one. Then check your logs and recent activity for unexpected use. Replacing the key takes minutes, while cleaning up after misuse takes much longer. Rotating the key on a schedule, even without a known leak, limits the damage from a copy you never noticed.
Common mistakes
- Pasting a production key into chat to debug a single error.
- Assuming a deleted chat message removes the key from every log.
- Committing a .env file and planning to remove it later.
