Defines prompt, output schema, and validation rules for span-level URT classification: - System prompt with span extraction rules - JSON schema for structured output - 4 few-shot examples (multi-span, temporal, comparative) - Structural and semantic validation rules - Error handling with retry + fallback - Performance considerations (token budget, batching, caching) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>