Apple Intelligence Proofread "Diff" feature missing?

Hello! I’m unfamiliar with how developers can implement Apple Intelligence. I’m also not a frequent user nor fan of AI tools. However, I think Apple Intelligence Writing Tools Proofread is useful on occasion, at least to do a sanity check.

I know Bear has support for Apple Intelligence Writing Tools, but is the full diff feature coming for proofread? Is this API even available to third party developers? Here’s a video of the diff UI that is available in Apple Notes. I can’t find this anywhere in Bear.

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If I’m not mistaken this functionality is limited to TextKit 2 apps and Bear uses version 1.