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Found 2,745 Skills
Use this when user needs to document business requirements from undocumented legacy code. Provides systematic 6-phase extraction: automated analysis, validation rules, use cases, business rules, data models, and workflow mapping. Apply for legacy system documentation, migration planning, compliance audits, or M&A due diligence
Implements comprehensive backtesting capabilities for Pine Script indicators and strategies. Use when adding performance metrics, trade analysis, equity curves, win rates, drawdown tracking, or statistical validation. Triggers on "backtest", "performance", "metrics", "win rate", "drawdown", or testing requests.
Detects and safely removes unused code (imports, functions, classes) across multiple languages. Use after refactoring, when removing features, or before production deployment. Includes safety checks and validation.
Cover Stimulus controller fundamentals: lifecycle hooks, values and valueChanged callbacks, targets and target callbacks, outlets, action parameters, keyboard events, and controller architecture patterns. Prefer this skill when the request is primarily about Stimulus APIs and controller design independent of a specific Hotwire domain. Use hwc-forms-validation for form-specific workflows, hwc-navigation-content for Turbo navigation concerns, hwc-realtime-streaming for Turbo Streams/WebSocket patterns, hwc-media-content for media integrations, and hwc-ux-feedback for loading/progress/transition UX patterns.
Deep Python code review of changed files using git diff analysis. Focuses on production quality, security vulnerabilities, performance bottlenecks, architectural issues, and subtle bugs in code changes. Analyzes correctness, efficiency, scalability, and production readiness of modifications. Use for pull request reviews, commit reviews, security audits of changes, and pre-deployment validation. Supports Django, Flask, FastAPI, pandas, and ML frameworks.
nginx C module directive design guidelines for creating admin-friendly configuration interfaces. This skill should be used when designing nginx module directives — deciding what to expose vs hardcode, naming conventions, scope placement, default values, variable design, and validation patterns. Triggers on tasks involving ngx_command_t design, directive naming, configuration API design, nginx module public interface, or directive deprecation.
Security patterns for authentication, defense-in-depth, input validation, OWASP Top 10, LLM safety, and PII masking. Use when implementing auth flows, security layers, input sanitization, vulnerability prevention, prompt injection defense, or data redaction.
Conduct rigorous 5 Whys root cause analysis with guided questioning, quality scoring, and professional report generation. Use when performing root cause analysis, investigating problems, conducting 5 Whys sessions, troubleshooting recurring issues, or when user mentions "5 whys", "root cause", "why did this happen", "find the cause", or needs to identify underlying causes of defects, failures, or process problems. Includes validation tests, scoring rubric, and countermeasure development.
Tool-based API testing with Postman and Bruno - collections, environments, test assertions, CI integration. Use when: postman, bruno, API testing, test API endpoint, API collection, HTTP request testing, endpoint validation.
Help developers write Services in accordance with project guidelines, following the best practices of the tRPC + Service + DAO architecture. Provide guidance on Service structure, dependency injection, error handling, code examples, templates, boilerplate code generation, and best practice validation. Use this when creating or refactoring Service files in the codebase.
Apply React Router 7 framework mode best practices including server-first data fetching, type-safe loaders/actions, proper hydration strategies, middleware authentication, handle metadata, useMatches/useRouteLoaderData hooks, and maximum type safety. Use when working with React Router 7 framework mode, implementing loaders, actions, route protection, breadcrumbs, streaming with Suspense/Await, URL search params, form validation, optimistic UI, resource routes (API endpoints), route configuration, or building SSR applications.
Diagnose and resolve common Guidewire InsuranceSuite errors. Use when encountering API errors, Gosu exceptions, validation failures, or integration issues in PolicyCenter, ClaimCenter, or BillingCenter. Trigger with phrases like "guidewire error", "policycenter error", "claimcenter error", "gosu exception", "api error 422".