Browse reusable Agent Skills, each with a clear purpose and practical guidance.
UNIX command-line interface guidelines for building tools that follow POSIX conventions, proper exit codes, stream handling, and the UNIX philosophy. This skill should be used when writing, reviewing, or designing CLI tools to ensure they integrate properly with the UNIX tool chain. Triggers on tasks involving CLI tools, command-line arguments, exit codes, stdout/stderr, signals, or shell scripts.
Describe your idea, get a deployed product. All Craft Coder skills + brainstorm, validation, marketing. Use when: user wants to build something from an idea, prototype, or MVP. Triggers: "build app", "create website", "make MVP", "I have an idea", "хочу приложение", "создать сайт", "сделать MVP".
提供网页应用全栈架构思考框架，涵盖前端渲染策略、后端 API 设计、基础设施部署、安全防护、性能优化五大维度。当需要设计完整 Web 应用、评审网页系统架构、或需要全局视角审视前后端协同设计时使用。支持 SPA/MPA、SSR/CSR、REST/GraphQL、容器/Serverless 等多种技术栈决策。
Use when you need to add or evaluate Maven dependencies that improve code quality — including nullness annotations (JSpecify), static analysis (Error Prone + NullAway), functional programming (VAVR), or architecture testing (ArchUnit) — and want a consultative, question-driven approach that adds only what you actually need. This should trigger for requests such as Add Maven dependencies; Add JSpecify nullness dependencies; Add Error Prone NullAway dependencies; Add VAVR functional dependencies; Add ArchUnit architecture testing dependencies. Part of cursor-rules-java project
Use when you need to review, improve, or refactor Java code for object-oriented design quality — including applying SOLID, DRY, and YAGNI principles, improving class and interface design, fixing OOP concept misuse (encapsulation, inheritance, polymorphism), identifying and resolving code smells (God Class, Feature Envy, Data Clumps), or improving object creation patterns, method design, and exception handling.
Use when you need to review, improve, or refactor Java code for type design quality — including establishing clear type hierarchies, applying consistent naming conventions, eliminating primitive obsession with domain-specific value objects, leveraging generic type parameters, creating type-safe wrappers, designing fluent interfaces, ensuring precision-appropriate numeric types (BigDecimal for financial calculations), and improving type contrast through interfaces and method signature alignment.
Use when you need to review, improve, or refactor Java code for generics quality — including avoiding raw types, applying the PECS (Producer Extends Consumer Super) principle for wildcards, using bounded type parameters, designing effective generic methods, leveraging the diamond operator, understanding type erasure implications, handling generic inheritance correctly, preventing heap pollution with @SafeVarargs, and integrating generics with modern Java features like Records, sealed types, and pattern matching.
Use when you need to refactor Java code to adopt modern Java features (Java 8+) — including migrating anonymous classes to lambdas, replacing Iterator loops with Stream API, adopting Optional for null safety, switching from legacy Date/Calendar to java.time, using collection factory methods, migrating to CompletableFuture for async operations, applying text blocks, var inference, or leveraging Java 25 features like flexible constructor bodies and module import declarations.
Decompose a large closure-based module into domain modules with shared state. Use when a single function/closure owns 1000+ lines of state and logic trapped by closure capture.