May 19, 2026 · System Architecture, LLM Safety, Serverless, Next.js, Python Agents, Cyber-Physical Systems, Applied AI

Parity Contracts for Polyglot LLM Commerce: A Case Study

LLM agents are crossing the boundary between read-only assistants and autonomous actors that write to external commerce systems. The LLM-safety-filter literature assumes, almost without exception, that a guardrail lives inside a single serving runtime—yet when a deployment spans multiple runtimes, in-process safety guarantees hold only as long as every customer-facing path traverses that runtime. We present a deployed case study of BrewHub PHL, a cyber-physical café platform.