The rules real projects give Cursor's agent, from .cursor/rules.
Files you open will collect here, so you can find them again.
Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.
Fadi88Cursor ruleFadi88/one-man-startup/.cursor/rules/skill-frontend-design.mdc
Distinctive, intentional visual design for any UI being built or reshaped - aesthetic direction, typography, layout, motion and interface copy that does not read as a templated default. Use on every ticket that changes what users see.
lacymorrowCursor rulelacymorrow/paperclip-hub/.cursor/rules/security.mdc
Security Best Practices and Guidelines
lacymorrowCursor rulelacymorrow/paperclip-hub/.cursor/rules/testing.mdc
Testing Best Practices and Guidelines
darknecrocitiesCursor ruledarknecrocities/SkillBuilder/.cursor/rules/fullstack.mdc
Fullstack rapid delivery skill with the strict anti-mock mandate. Builds complete vertical slices with real persistence, validation, and zero toy data.
darknecrocitiesCursor ruledarknecrocities/SkillBuilder/.cursor/rules/performance.mdc
Performance profiling and optimization skill. Audits Core Web Vitals (LCP, CLS, INP), N+1 queries, bundle budgets, and memory leaks.
darknecrocitiesCursor ruledarknecrocities/SkillBuilder/.cursor/rules/prompt-polish.mdc
Evaluates, manages, and polishes user prompts into token-efficient, crystal-clear engineering specifications with explicit constraints, verification criteria, and edge-case coverage before code generation.
darknecrocitiesCursor ruledarknecrocities/SkillBuilder/.cursor/rules/qa.mdc
Comprehensive Two-Tier Quality Assurance skill. Features Full UI/Frontend QA (viewports, touch ergonomics, WCAG 2.2 AA, sub-pixel lighting, 120Hz compositor) and Full App Functional QA (state machines, real persistence, 3s/15s network resilience, mobile OS lifecycle, memory leaks, security, and Master Error Catalog).
darknecrocitiesCursor ruledarknecrocities/SkillBuilder/.cursor/rules/research.mdc
Autonomous deep researcher and fallback engine. Evaluates trade-offs and discovers production-grade alternatives when dependencies fail or libraries are deprecated.
laragenticCursor rulelaragentic/agents/.cursor/rules/callback-system.mdc
Lifecycle callback system design for agentic loops
simtlixCursor rulesimtlix/simfinity.js/.cursor/rules/simfinity-architecture.mdc
Simfinity.js project architecture overview -- always loaded for context
simtlixCursor rulesimtlix/simfinity.js/.cursor/rules/simfinity-documentation.mdc
Maintain the monorepo, package and public website documentation for both databases
Kevin-Liu-01Cursor ruleKevin-Liu-01/Sigil-UI/.cursor/rules/taste-enforcement.mdc
Taste Enforcement — Anti-Slop Frontend Rules > Adapted from [tasteskill.dev](https://www.tasteskill.dev/) for Sigil's token-driven architecture. > These rules override default LLM biases that produce generic, forgettable frontends. > Cross
Kevin-Liu-01Cursor ruleKevin-Liu-01/Sigil-UI/.cursor/rules/taste-skills-index.mdc
Reference Table | Skill | When to Read | One-Line Purpose | |-------|--------------|------------------| | `taste-core` | Default for any frontend task | Variance dials (8/6/4), banned patterns, creative arsenal, motion engine | | `taste-gpt` | Using GPT/Codex models
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/agent-iteration-limits.mdc
minute timeout** for user response - **Oneshot channels** for async communication - **Event emission** to frontend via `agent-continuation-request` - **Cleanup on timeout/error** to prevent memory leaks ### Frontend: [src/hooks/useBackendEvents.ts](mdc:src/hooks/useBackendEvents.ts
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/agent-tool-development.mdc
Tool Implementation**: Core logic in `src-tauri/src/agent/tools/{tool_name}.rs` 2. **Tauri Commands**: Frontend interface in `src-tauri/src/commands/{tool_name}.rs` 3. **Registration**: Integration in [factory.rs
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/agent-trigger-modes.mdc
agent_trigger_mode() { AgentTriggerMode::Tap => // Original toggle behavior AgentTriggerMode::Hold => // New agent_monitor handling } ``` ## Frontend Integration ### Settings UI Agent trigger mode selection in [src/components/settings/sections/GeneralSettings.tsx](mdc:src/components/settings/sections/GeneralSettings.tsx): - Select dropdown with descriptive
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/constants-management.mdc
management with automatic generation from Rust to TypeScript to ensure consistency between backend and frontend. ## Architecture ### Generated Constants: [src/lib/constants.generated.ts](mdc:src/lib/constants.generated.ts) **Auto-generated from Rust** - Never edit manually! ```typescript // This
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/event-system-patterns.mdc
React state management, and comprehensive cleanup patterns. The system ensures reliable state synchronization between frontend and backend components. ## Event Architecture ### Tauri Event System Core event handling in [src-tauri/src/lib.rs
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/keyboard-shortcut-validation.mdc
tauri/src/state.rs) - Commands for settings in [src-tauri/src/commands/core.rs](mdc:src-tauri/src/commands/core.rs) **Frontend Integration:** - Settings UI in [src/components/settings/sections/GeneralSettings.tsx](mdc:src/components/settings/sections/GeneralSettings.tsx) - Help documentation in [src/components/ModalSystem.tsx](mdc:src/components/ModalSystem.tsx) - State management hooks
lacymorrowCursor rulelacymorrow/juno/.cursor/rules/no-backward-compatibility.mdc
constants from src-tauri/src/constants/* for rust or [src/lib/constants.generated.ts](mdc:src/lib/constants.generated.ts) on the frontend to prevent sync issues 5. **Clean Architecture** - Prefer clean, lean, maintainable code over compatibility ## When Refactoring
Instruction files for Cursor's agent, kept in .cursor/rules/ as .mdc files.
A rule can apply only to files matching a pattern, or only when the agent asks for it. AGENTS.md always applies.
Copy the .mdc file into your project's .cursor/rules/ directory and adjust its globs.
Open a rule to see its discussion. Reports from people and their agents are coming.
