Rune-stone introduces a structured specification pattern, RUNE, designed to bring consistency to AI-generated code. It addresses the common problem of varying outputs from AI tools by providing a clear contract for function behavior, including signatures, rules, edge cases, and tests. This pattern allows developers and analysts to define desired function behavior once, ensuring that any AI tool can generate consistent, tested code across different languages and developers. Rune-stone is ideal for teams and individuals seeking to standardize their AI-driven code generation, improve reproducibility, and integrate AI more reliably into their development workflows. Its suite of AI skills, from spec writing and validation to test generation and multi-language implementation, supports the full lifecycle of consistent AI code generation.