CloudEmu Synthesizes Cloud Emulators From Documentation and Beats LocalStack, Built by a Team Over a Decade

arXiv 2608.23842·medium signalXBlueskyLinkedInCopy link

Testing DevOps programs normally requires provisioning real cloud resources, which is slow, unsafe and costly, and hand-building emulators means manually reading extensive cloud documentation and coding logic per service and API against a target that keeps changing. CloudEmu constructs emulators automatically via neurosymbolic code synthesis, combining LLM documentation comprehension and code generation with cloud-specific symbolic abstractions that suppress hallucinations, then uses the real cloud as an oracle for automated testing, repair and alignment. Evaluated on AWS and GCP services, it outperforms LocalStack, the leading existing tool, on both coverage and accuracy.