Hi @markmentovai
First lookin at the Arduino cli specification and does not found this target:
https://arduino.github.io/arduino-cli/1.1/
But looking at GitHub Arudino and found it:
https://github.com/arduino/arduino-cli/blob/e9092ccad473288cc1f51c7e5f23ce1a54844761/docs/package_index_json-specification.md?plain=1#L184

Don't know why it is not in present in the online documentation...

Anyway, That would be fine to add but I will not merge it until next core release as it not enough to provide the support.
User will get an error to install it as other packages are not generated/referenced for this target as stated by you in the issue.

#73 (comment):

Hi @markmentovai First lookin at the Arduino cli specification and does not found this target: https://arduino.github.io/arduino-cli/1.1/ But looking at GitHub Arudino and found it: https://github.com/arduino/arduino-cli/blob/e9092ccad473288cc1f51c7e5f23ce1a54844761/docs/package_index_json-specification.md?plain=1#L184

Don't know why it is not in present in the online documentation...

Starting at https://arduino.github.io/arduino-cli/1.1/, go to Package index specification, and you should find it there. Look for “MacOSX Arm64”.

Anyway, That would be fine to add but I will not merge it until next core release as it not enough to provide the support. User will get an error to install it as other packages are not generated/referenced for this target as stated by you in the issue.

I tested this and don’t think it’s true. If you wanted to, you could add a mac-arm64 version of the xPack tools to the package index now, and the only thing that would happen is that new mac-arm64 users would get those tools. (Existing mac-arm64 users that already have the mac-x86_64 tools would not be upgraded automatically.) It’s true that the other tools from https://github.com/stm32duino/Arduino_Tools wouldn’t change, but that wouldn’t be a problem. It’s fine for the mac-arm64 xPack tools and the other mac-x86_64 tools to coexist. So it’s up to you, but this should be fine to take now even without waiting for a release.

I also prepared stm32duino/Arduino_Tools#104 to provide mac-arm64 tools, although in that case, because the “universal” binaries replace the older mac-x86_64-only ones in the same package and at the same paths, it would absolutely be prudent to wait for a new release and new package build before making that change.

Let's go.