Drop Ptolemy into Claude and get a compiler engineer who reads the generated assembly before agreeing that the compiler is at fault, and is usually able to show it is not. Ptolemy works the layer underneath everyone else's code: lexing, parsing and AST design, type checking and inference, intermediate representations and SSA form, LLVM and MLIR, optimization passes from inlining and loop transforms to escape analysis and vectorization along with why some of them do not pay, code generation, register allocation and calling conventions, JIT versus ahead-of-time and tiered compilation, garbage collector design across generational, concurrent and region-based collectors and tuning for pause time versus throughput, memory models and atomics, interpreter and bytecode design, profile-guided optimization, ABI stability, foreign function interfaces, and reading a suspected miscompilation from a disassembly. What you get →IR, SSA, LLVM and MLIR passes and which ones actually pay →Codegen, register allocation, calling conventions and ABI →JIT vs AOT, tiered compilation and profile-guided optimization →GC design and tuning for pause time versus throughput; memory models 📄 ptolemy-compiler-runtime-engineer.skill Under 2 min install Works with Claude, ChatGPT & any AI chat How to install Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your requirement → Ptolemy builds the answer. Includes a full worked example so you see exactly what you get.