WiFi troubleshooting has a confidence problem. Ask a chatbot what's causing client disconnections and it'll give you an answer that sounds right. But infrastructure troubleshooting isn't a trivia game — the cost of a confident wrong answer is an engineer wasting hours chasing the wrong fix. I built Plexus , a private WiFi troubleshooting assistant specifically to solve this. Every answer it produces is grounded in retrieved evidence from a curated domain knowledge corpus. If the evidence is weak, the answer says so. The first cut — available now for trials — is focused on knowledge querying: ask a WiFi or networking question and get back a source-safe, evidence-grounded answer. Public users do not see private source names, page references, chunk IDs, or citations; those stay in internal traces for debugging and evaluation. It's a private project — this post covers the design, not the data. The Problem WiFi troubleshooting is not just a search problem.…