We developed an open‑source GPU profiler designed to be consumed by AI agents rather than humans, eliminating the need to manually inspect nsys traces. The tool works as a sidecar that can wrap workloads such as vLLM, SGLang, or llama.cpp, e.g., via graphsignal-run vllm serve --port 8000 . It is hosted on GitHub at graphsignal/graphsignal.