LLMs generating glue logic between UI schemas and constrained runtimes

Show HN: LLMs generating glue logic between UI schemas and constrained runtimes

LLMs generating glue logic between UI schemas and constrained runtimes operates in show hn launch.

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We’re shipping an execution model that sits between LLM code generation and autonomous agents.The LLM generates only the glue logic between two deterministic interfaces: - a UI schema the frontend knows how to render - a constrained runtime interface exposed by the backend, from specific functions like list_comments to broader primitives like a restricted http_callBoth interfaces are fixed, typed, and inspectable. The LLM can’t invent UI components or backend capabilities. It only composes what already exists.This is adjacent to A2UI, but the cut is different. A2UI renders agent actions into UI. Here, UI and runtime are first-class, and the LLM generates the composition logic without an open

LLMs generating glue logic between UI schemas and constrained runtimes is positioned in show hn launch, a segment that rewards a clear, focused offering.

It is recorded at the Show HN launch stage.

Website: cased.com/blog/2025-12-11-how-we-build-generative-ui