Building GraceSoft Sentinel Concierge: From WhatsApp Bot to Production Booking Agent I spent the last stretch building GraceSoft Sentinel Concierge — a WhatsApp-first concierge agent designed to handle customer enquiries, FAQs, bookings, and business handover without requiring users to download another app. What started as “a simple WhatsApp assistant” quickly turned into a full production exercise in systems design, operational resilience, and the kind of edge-case engineering that only shows up when real users start sending messy messages. This is the dev log of what I built, what broke, and what I learned. What GraceSoft Sentinel Concierge Is GraceSoft Sentinel Concierge is a WhatsApp concierge agent for service businesses. Its job is simple: answer FAQs detect booking intent suggest available slots create bookings escalate to a human when confidence drops avoid sounding robotic while doing all of the above Under the hood, it’s doing much more than that.…