Debugging the 'Ghost Edit': When AI Changes Code You Didn't Ask For
AI agents have a tendency to 'fix' things they weren't asked to touch. Learn how to use diff-locking and scope-limiting prompts to prevent unwanted code drift.
You asked for a button color change. The AI gave you the color change, but also reformatted your entire CSS file, deleted your TODO comments, and renamed your variables to snake_case. Welcome to the Ghost Edit.
The "Completion" Bias
LLMs are trained to "complete" documents. If you give them a file, they often feel compelled to "improve" the whole thing. They don't understand that your messy code was messy for a reason (or that you just didn't want it touched right now).
The Fix: Scope Limiting
- Don't send the whole file: If possible, only highlight the function you want changed (Cursor's `Cmd+K` selection feature is great for this).
- The "Surgical" Prompt: Explicitly instruct: "Only modify the `render` function. Do not touch imports. Do not reformat."
- Review the Diff: Never auto-accept. Use your IDE's diff view (Cursor's diff view is excellent) to spot these subtle changes before they pollute your git history.
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