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Seven Cursor Rules for .NET Engineers to Prevent Common AI Code Mistakes

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A weekly digest published on the Agentic Architect blog outlines seven daily coding rules for senior C#/.NET developers using the Cursor AI code editor, covering the week ending August 30, 2026. The rules address common pitfalls that AI-generated code can introduce, such as Singleton-Scoped service mismatches, missing CancellationToken propagation, and improper HttpClient instantiation. Other guidance covers injecting TimeProvider instead of using static DateTime APIs, adopting .NET 9 MapGroup patterns, enforcing FluentValidation on MediatR requests, and using structured logging templates over string interpolation. The rules are designed to prevent 'context rot,' where the AI loses track of business constraints or architectural conventions during code generation. A free starter Cursor rule file, arch-core-lite.mdc, is available on GitHub, with a full rule kit offered as a one-time purchase for £9.00.

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