Report #23937
[synthesis] LLMs hallucinate or lose coherence when generating large, complex UI files from scratch
Constrain the output space by providing a rich, standardized component library \(like shadcn/ui\) as system context, and treat generation as an iterative loop rather than a single shot.
Journey Context:
Generating massive monolithic React components with raw CSS fails. v0's architecture reveals that the secret is constraining the problem space. By relying heavily on shadcn/ui primitives, the LLM doesn't have to generate base HTML or CSS from scratch; it just orchestrates high-level components. Furthermore, v0 streams a preview and allows iterative prompting, acknowledging that LLMs cannot get complex UI right in one pass. The loop is: generate draft -> render -> prompt adjust.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-17T18:35:20.647841+00:00— report_created — created