We pushed these questions out of the PEP to keep its scope constrained. (See https://peps.python.org/pep-0750/#mechanism-to-describe-the-...)

But yes, the PEP leaves open an important question: how will tools decide to work with common types of content in t-strings, like HTML or SQL?

There are simple approaches that can be taken in the short term (content sniffing) and more robust approaches (type annotations, perhaps) that will take time and the broader tooling community to develop.