Hey, good news, both features are already in Cursor, they’re just not always easy to spot.
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Undo/Revert = Checkpoints. Hover over your previous request in the Agent chat, and you’ll see an icon on the right to roll back to the state before that message. It reverts both the code and the chat context. If you don’t see checkpoints, check this thread: Cursor 3: Where are the checkpoints?
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CSS Inspector = Browser tool. Agent has a built-in browser where you can pick elements on the page, then the agent gets their DOM/CSS and can edit styles right away. More details: Browser | Cursor Docs
Give it a try and let me know if anything doesn’t work the way you expected, then we can dig in with specifics.