Rust no std Purpose Guide agents through Rust development: what and provide vs , implementing custom global allocators, panic handler selection for embedded targets, and strategies for testing crates on the host machine. When to Use Use this skill when writing or debugging Rust code — library crates for embedded targets, or bare-metal firmware that cannot link against . For the full embedded development workflow (probe-rs flashing, defmt logging, RTIC), use . For cross-compilation target setup, use . This skill focuses specifically on the / / boundary and panic handler selection. Examples - "…