How can I prevent Claude from writing unsolicited code?

Try creating a to-do list for Claude! Instead of telling it what not to do, focus on positive instructions. Just outline what it should focus on and execute only those items on the list—I've found this approach yields better results.

Honestly, I've switched to using Cline, a VS Code extension, which has a 'Plan/Act' mode. In 'Plan' mode, it can't write or edit files, which helps maintain focus. I used to face the same issues with Claude, but just having that restriction makes a huge difference. It's baffling that such a basic feature isn't available in other tools yet.

I feel your frustration! What’s worked for me is starting every prompt with "Do not write code." It’s a hassle to repeat it, but it does help get the outcome you want. I even use Autohotkey to set up 'pre-prompts' for convenience.

I've had a similar experience, but I found a way to get Claude to listen. I started with a directive like, "You are not allowed to write code until we discuss it first." This has worked pretty well for me. Just make sure to set clear conditions from the get-go. It seems like tying the instruction to a condition helps regulate its responses.

One thing I do is insist on getting agreement before Claude writes code. I’ll clarify our plan first, then give it the green light to proceed. It’s about setting the right communication flow.