Successor When a 25-year process engineer retires off an SMT line, the manuals stay but the knowledge leaves. Manuals describe what a machine is supposed to do. The veteran knows what it actually does when it fails at 2am. So the plant keeps calling him for months. Successor catches that knowledge on the way out the door. A voice agent runs the exit interview as an interrogator, not a recorder. It tracks which of 60 fault classes it has covered, picks the biggest hole, and refuses an answer until it has the decision criteria and the failure branch. That knowledge becomes an agent bound to a machine. An operator asks in plain language. MongoDB Atlas fuses keyword search for part numbers with vector search for symptoms, then ranks by what actually worked. The agent returns one step, in the engineer's voice, with attribution. "Did that clear it?" No branches to her fallback. The repair runs as checkpointed state, so a dead tablet resumes at the exact step. When it can't answer, it logs the gap and opens the next interview with: "Someone on Reflow 2 asked about this Tuesday and I couldn't answer. Walk me through it." Failure to answer becomes the next question asked. Built with: MongoDB Atlas (hybrid search, reranking, change streams, checkpoints), ElevenLabs, LangGraph, Fireworks.
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