Rules files are a game changer for developers and prompts.Cursor introduces rules files which allow users to specify prescriptive prompts while developing code.Using @mentions in Cursor provides optimal code context.Agentic AI find ways to create well-structured code by using the PEP8 Python guide for code quality.Creating rules files for different languages affords best practices and project structuring per language.PEP8 also provides guidelines for documenting code, how to handle error messages, and much more.Agentic AI has solved the problem of monolithic blocks of code, generating neater and readable functions conforming to coding principles.The lines of generated code are easily understandable, follow naming conventions and avoid duplication.Composer gives you a run down of the rules it followed to create the generated code.Rules files allow developers to focus on tasks by knowing that prompts will conform to best practices.