Mechanistic interpretability toolkit for code LLMs, in Rust. Analysis of attention patterns in transformers (StarCoder2 3B, Qwen2.5-Coder 3B & 7B, CodeGemma 7B, Phi-3-mini-4k, Code-LLaMA-7B) and state dynamics in RNNs (RWKV-6-Finch-1B6).