Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Ahah, progress. I was trying to use it in release mode, not debug. Debug works fine now, thanks for your help.
I was trying to use the Ac6 STM32 debugging launcher, so that would probably explain why only debug is working.