Dynamic UI Generation with GPT-5 Pro

Create a tool for your Vercel AI SDK agent that, when called, instructs GPT-5 Pro to generate a small HTML/CSS snippet for a dynamic UI element (e.g., a 'low health' warning, an 'objective updated' banner). The agent should pass relevant game state to GPT-5 Pro, which then outputs the UI code. Describe how the client-side UI would render this snippet. Provide the agent tool definition and a sample GPT-5 Pro prompt for UI generation.