The OpenWhisk Debugger (**wskdb**) is a now‑deprecated tool for stepping through and inspecting Apache OpenWhisk serverless functions. It provides a Node‑based client that lets developers attach to, log, and debug actions locally, but it only works with the very old Node 6.0‑6.2 runtime and is no longer maintained. It was intended for OpenWhisk developers needing low‑level debugging of their functions.