5 .cursorrules patterns that make Cursor actually reliable

Most `.cursorrules` files are a mess of good intentions and unpredictable behavior. You add rules to fix specific bugs. You add rules to encourage patterns you like. Then Cursor starts doing things you didn't expect — ignoring some rules, applying others inconsistently, or generating code that contradicts your own instructions. The problem isn't Cursor. The problem is rule structure. Here are 5 patterns that turn a chaotic `.cursorrules` file into a reliable development partner. --- ## Pattern 1: Explicit precedence sections When two rules conflict, Cursor picks one arbitrarily. You can't predict which wins. **The bug:** ```markdown # Fix all async functions - When writing async code, use await properly # Use modern JS patterns - Prefer async/await over callbacks ``` These contradict. Which rule applies to `await fetch()`? **The fix:** ```markdown # === HIGH PRIORITY === # Fix all async functions - When writing async code, use await properly # === MEDIUM PRIORITY === # Use modern JS patterns - Prefer async/await over callbacks ``` Clear sections prevent ambiguity. Cursor knows which section takes precedence when rules overlap. --- ## Pattern 2: Framework-specific scoping Generic rules are useful, but framework rules need to be scoped. **The bug:** ```markdown # Use named exports - Always prefer named exports over default exports ``` This rule breaks React components, where default exports are idiomatic. **The fix:** ```markdown # === REACT COMPONENTS === - Use default exports for components - Name the file after the component # === LIBRARY CODE === - Use named exports for utility functions - Group related exports together ``` Context-specific rules prevent one pattern from bleeding into another context. --- ## Pattern 3: Negative constraints before positive instructions Telling Cursor what *not* to do is as important as telling it what to do. **The bug:** ```markdown # Use TypeScript effectively - Add type annotations where helpful - Prefer interfaces over types ``` Cursor starts over-annotating everything, including simple utility functions where types add no value. **The fix:** ```markdown # === TYPESCRIPT RULES === # Negative constraints - Do not add explicit types to simple function returns - Do not over-annotate variables when types are inferred - Do not use `any` except in generic constraints # Positive instructions - Add type annotations where inference fails - Prefer interfaces for object shapes - Use types for unions and computed types ``` Negative constraints create guardrails. Positive instructions operate within them. --- ## Pattern 4: Deprecated pattern exclusions APIs change. Your `.cursorrules` file shouldn't recommend old patterns. **The bug:** ```markdown # Database queries - Use Prisma for database access - Write clean queries with the query builder ``` Cursor generates `findMany` calls with deprecated arguments because that's what your old code looked like. **The fix:** ```markdown # === PRISMA RULES === # Deprecated patterns — do NOT use - Do not use `findMany` with deprecated options - Do not use raw SQL unless explicitly necessary - Do not nest transactions without reason # Current best practices - Use the latest Prisma query syntax - Prefer type-safe query methods - Use transactions only for atomic operations ``` Explicitly deprecated patterns prevent Cursor from learning from outdated code. --- ## Pattern 5: Model-specific fallback behavior Different Cursor models behave differently. Your rules should account for that. **The bug:** ```markdown # Code generation - Be concise and direct - Add helpful comments where context is missing ``` Claude generates verbose explanations. GPT-4 generates almost none. Both are "concise" by their own definition. **The fix:** ```markdown # === MODEL-SPECIFIC RULES === # For Claude models - Be thorough in explanations - Add detailed context to non-obvious decisions - Break complex logic into steps # For GPT models - Be concise and direct - Add comments only where necessary - Prefer brevity in utility functions # For all models - Follow project-specific style guides - Respect existing code patterns - Ask before introducing new dependencies ``` Model-specific rules ensure consistent behavior across different Cursor engines. --- ## The common thread All 5 patterns share the same principle: **explicit structure over ambiguous intent.** A `.cursorrules` file is not a wishlist. It's a contract. When you make the contract explicit — with clear sections, scoped rules, negative constraints, deprecated patterns, and model-specific behavior — Cursor stops guessing and starts delivering predictable, reliable code generation. --- I packaged 50 production-tested rules covering these patterns and more into a full Cursor Rules Pack. If you want a drop-in `.cursorrules` file that actually works consistently, it's available here: https://oliviacraftlat.gumroad.com/l/wyaeil