It would be spectacular to have a tool like this to enforce, and automatically revise, code style guidelines as languages evolve. Keeping up with something like the C++ Core Guidelines [0] can be a fair amount of work, as you need to respect existing idioms to keep your codebase coherent (a higher priority than respecting the "one true style", in my opinion).

A tool like this would be brilliant if it could automatically generate suggestions for "hybrid styles" that fit your existing codebase, and provide suggestions to migrate existing code patterns to "correct" ones over time.

[0]: https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines