Serve AI uses LiveKit Agent Simulations to rebuild its voice agent on a single prompt

Serve AI rebuilt its phone agent for a $150M pest control customer on LiveKit, collapsing a 224-node Retell flow graph into a single prompt and validating it with Agent Simulations. About 100 real production calls were converted into simulation scenarios, reaching a 98% pass rate over 10–15 iterations before cutover, with median turn latency of 1.3 seconds against a 1.5 second ceiling. The first migration took one week with no rollback, and containment rose 15%, which Serve estimates saves the customer an additional $320,000 a year.