There is no reliable way to determine target snap architecture or at least project.target_arch does not provide consistent value tested with snapcraft version 3.0.1 Tested use cases: native build: project.target_arch - has expected value SNAPCRAFT_ARCH_TRIPLET has host arch cross build with --target-arch: project.target_arch has expected target arch value SNAPCRAFT_ARCH_TRIPLET has target arch build on amd64 with following statement in snapcraft.yaml architectures: - build-on: [amd64, arm64] run-on: arm64 expected values: project.target_arch has target arch SNAPCRAFT_ARCH_TRIPLET has target arch actual values: project.target_arch is empty SNAPCRAFT_ARCH_TRIPLET has host arch