Essential command-line tools and system utilities.
This skill should be used when the user asks to "inspect the page", "take a screenshot", "check how it looks", "check console", "console errors", "JavaScript errors", "debug the page", "analyze performance", "page speed", "performance trace", "why is it slow", "check network", "API calls", "network requests", "loading issues", "check localhost", or mentions frontend debugging, browser inspection, or DevTools analysis.
JavaScript coding standards and best practices. This skill should be used when writing, reviewing, or refactoring JavaScript code. Triggers on tasks involving vanilla JavaScript, DOM manipulation, async operations, or performance optimization.
Debug web app by capturing and analyzing console errors using Chrome DevTools MCP
Go performance optimization guidelines for profiling, allocation, GC tuning, concurrency, PGO, and I/O. This skill should be used when writing, reviewing, or optimizing Go code for performance. Triggers on tasks involving slow services, high latency, high memory usage, memory leaks, goroutine leaks, GC pressure, CPU profiling, pprof analysis, allocation reduction, sync.Pool, mutex contention, HTTP client tuning, Profile-Guided Optimization, GOMEMLIMIT tuning, Go 1.24 features, Swiss Tables, or any Go performance investigation.
iOS Simulator interrogation: simctl screenshots/video, Web Inspector for web content, Instruments for native behaviors.
Use Chrome DevTools MCP for browser-side dev/test/debug (console, network, performance, UI issues). Trigger when debugging frontend behavior or performance.
NetGraph contributor development workflow. Use when: setting up dev environment, running tests or lint, fixing CI failures, running performance benchmarks, troubleshooting venv issues, or asking about make targets. For running scenarios and interpreting results, use netgraph-dsl instead.
Four-phase structured debugging methodology. Use when (1) tests fail unexpectedly, (2) functions produce wrong values, (3) systems show anomalous results, (4) unexpected errors appear, (5) performance regresses, (6) multiple quick fixes have already failed. Enforces root cause investigation before any fix attempt.
外部公開を想定したphpフレームワークのコードレビューをする際に、破壊的変更（breaking change）の有無を確認し、破壊的変更がある場合は適切に処理されているかをチェックするスキルです。
Optimizes Python library performance through profiling (cProfile, PyInstrument), memory analysis (memray, tracemalloc), benchmarking (pytest-benchmark), and optimization strategies. Use when analyzing performance bottlenecks, finding memory leaks, or setting up performance regression testing.
Use when you need to understand the codebase structure, find definitions, or trace references without reading entire files.
WHEN: Performance analysis, bundle size optimization, rendering, Core Web Vitals, code splitting WHAT: Bundle analysis + large dependency detection + re-render issues + useMemo/useCallback suggestions + LCP/FID/CLS improvements WHEN NOT: Code quality → code-reviewer, Security → security-scanner
Experimental allocation profiler tracking memory allocations at guest-language level. Shows allocation sites, object types, and memory pressure patterns. Use to identify allocation-heavy locations, find unnecessary object creation, and understand memory behavior. High allocations in hot loops = optimization opportunity if escape analysis isn't eliminating them.
Analyze network traffic captures and artifacts for forensic investigation. Use when investigating data exfiltration, command and control communications, lateral movement, or network-based attacks. Supports PCAP, PCAPNG, and NetFlow analysis.
Navigates WPF Visual Tree and Logical Tree with VisualTreeHelper and LogicalTreeHelper patterns. Use when traversing elements, accessing template internals, or understanding event routing.
Master binary analysis patterns including disassembly, decompilation, control flow analysis, and code pattern recognition. Use when analyzing executables, understanding compiled code, or performing static analysis on binaries.
Static triage for macOS .app bundles and Mach-O binaries; bundle map, signature/entitlements, imports/symbol hints.
