Costs one extra round trip and saves the twenty-file diff you have to read afterwards. Point 4 is what makes it useful for people who cannot read the diff quickly.
Prompt
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Before you change anything, write a plan:
1. The files you will touch, one line each, with what changes in them.
2. The files you will read but not change.
3. What could break elsewhere.
4. How I can see it worked in the browser.
Do not write code in this message. I will reply "go", or correct the plan first.
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