Guide secure migration of code from memory-unsafe languages (C, C++, Assembly) to memory-safe languages (Rust, Go, Java, C#, Swift). Use when migrating or rewriting legacy C/C++ code, designing FFI boundaries between safe and unsafe code, writing new modules in existing C/C++ codebases, reviewing mixed-language projects, planning memory safety roadmaps, or when an AI agent is about to generate new C/C++ code that could be written in a memory-safe language instead. Also triggers on CISA/NSA memory safety compliance discussions.