Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
In the interests of helping others who may struggle with cryptic errors like this in my case this was caused by my NUCLEO-H745ZI-Q.xml file having become corrupted ... it was no longer an XML file but a binary file consisting mostly of nulls. I replaced it with a good version and CDT is working again as expected.