The claude plugin with Opus 5 / Fable5.1 works well in my experience. Diffs are not supported yet but maybe in the future? Although the claude plugin does stage edits before applying them so you can selectively apply them and [hopefully] not get contextually overloaded.

Isn't that what (Microsoft, not Github) Copilot was supposed to be?

The closest tool I have found is vibewrite.work

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