Formal Disco is a distributed system for coordinating LLM workers that generate formally verified programs at scale. Initiators derive sketches from open-source READMEs and documentation, fixers respond to compiler and verifier feedback, and extenders propose patches to working programs. The system records agent traces for distillation and self-improvement, while iterative supervised fine-tuning maximizes synthetic-program entropy to increase diversity. The authors release datasets in Dafny, Verus, and Frama-C, and report that fine-tuned open models often match or exceed Claude Opus 4.5 on verification-related tasks. The available information is limited to the arXiv abstract.
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