umairinayat

Testing patterns and principles. Unit, integration, mocking strategies.

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3D game development principles. Rendering, shaders, physics, cameras.

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Tailwind CSS v4 principles. CSS-first configuration, container queries, modern patterns, design token architecture.

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Fast headless browser for QA testing and site dogfooding. Navigate any URL, interact with elements, verify page state, diff before/after actions, take annotated screenshots, check responsive layouts, test forms and uploads, handle dialogs, and assert element states. ~100ms per command. Use when you need to test a feature, verify a deployment, dogfood a user flow, or file a bug with evidence.

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Systematically QA test a web application. Use when asked to "qa", "QA", "test this site", "find bugs", "dogfood", or review quality. Four modes: diff-aware (automatic on feature branches — analyzes git diff, identifies affected pages, tests them), full (systematic exploration), quick (30-second smoke test), regression (compare against baseline). Produces structured report with health score, screenshots, and repro steps.

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Import cookies from your real browser (Comet, Chrome, Arc, Brave, Edge) into the headless browse session. Opens an interactive picker UI where you select which cookie domains to import. Use before QA testing authenticated pages.

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Ship workflow: merge main, run tests, review diff, bump VERSION, update CHANGELOG, commit, push, create PR.

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API design principles and decision-making. REST vs GraphQL vs tRPC selection, response formats, versioning, pagination.

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Architectural decision-making framework. Requirements analysis, trade-off evaluation, ADR documentation. Use when making architecture decisions or analyzing system design.

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Socratic questioning protocol + user communication. MANDATORY for complex requests, new features, or unclear requirements. Includes progress reporting and error handling.

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Design thinking and decision-making for web UI. Use when designing components, layouts, color schemes, typography, or creating aesthetic interfaces. Teaches principles, not fixed values.

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Game development orchestrator. Routes to platform-specific skills based on project needs.

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Internationalization and localization patterns. Detecting hardcoded strings, managing translations, locale files, RTL support.

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React and Next.js performance optimization from Vercel Engineering. Use when building React components, optimizing performance, eliminating waterfalls, reducing bundle size, reviewing code for performance issues, or implementing server/client-side optimizations.

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Server management principles and decision-making. Process management, monitoring strategy, and scaling decisions. Teaches thinking, not commands.

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Test-Driven Development workflow principles. RED-GREEN-REFACTOR cycle.

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Advanced vulnerability analysis principles. OWASP 2025, Supply Chain Security, attack surface mapping, risk prioritization.

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Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".

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Project scaffolding templates for new applications. Use when creating new projects from scratch. Contains 12 templates for various tech stacks.

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Fast headless browser for QA testing and site dogfooding. Navigate any URL, interact with elements, verify page state, diff before/after actions, take annotated screenshots, check responsive layouts, test forms and uploads, handle dialogs, and assert element states. ~100ms per command. Use when you need to test a feature, verify a deployment, dogfood a user flow, or file a bug with evidence.

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Pragmatic coding standards - concise, direct, no over-engineering, no unnecessary comments

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Code review guidelines covering code quality, security, and best practices.

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MCP (Model Context Protocol) server building principles. Tool design, resource patterns, best practices.

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Master Rust 1.75+ with modern async patterns, advanced type system features, and production-ready systems programming. Expert in the latest Rust ecosystem including Tokio, axum, and cutting-edge crates. Use PROACTIVELY for Rust development, performance optimization, or systems programming.

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