IDE & Editors

This skill enables Claude to execute visual regression tests using tools like Percy, Chromatic, and BackstopJS. It captures screenshots, compares them against baselines, and analyzes visual differences to identify unintended UI changes. Use this skill when the user requests visual testing, UI change verification, or regression testing for a web application or component. Trigger phrases include "visual test," "UI regression," "check visual changes," or "/visual-test".

This skill provides a complete and streamlined workflow for performing methylation variability and epigenetic heterogeneity analysis from whole-genome bisulfite sequencing (WGBS) data. It is designed for researchers who want to quantify CpG-level variability across biological samples or conditions, identify highly variable CpGs (HVCs), and explore epigenetic heterogeneity.

This skill should be used when generating AI image assets for websites, landing pages, or applications. It automatically analyzes page requirements, generates images using Gemini API, removes backgrounds, converts to SVG for interactivity, and places assets in frontend code. Ideal for creating hero images, icons, backgrounds, product mockups, and infographic elements. Use this skill when users need image assets for their web projects.

スクラム・カンバンの実践知識とアジャイルプロジェクト管理の体系的手法。ジェフ・サザーランドのスクラムフレームワークを基盤として、イテレーティブ開発とチームの自己組織化を実現します。**アンカー（Anchors）**:• Agile Estimating and Planning（Mike Cohn）/ 適用: 見積もりと計画 / 目的: スプリント計画とイテレーション管理• Scrum Guide（Jeff Sutherland, Ken Schwaber）/ 適用: スクラムフレームワーク / 目的: チーム運営とイテレーション実現**トリガー（Trigger）**:- プロジェクト初期化時のアジャイル体制構築- スプリント計画ミーティング開始時- ユーザーストーリー作成・修正時- バックログ優先順位付けセッション実施時- スプリント終了時のレトロスペクティブ- チーム編成や役割変更の決定時📖 参照書籍:- 『Agile Estimating and Planning』（Mike Cohn）: 見積もりと計画- 『Scrum Guide』（Jeff Sutherland, Ken Schwaber）: スクラムフレームワーク📚 リソース参照:- `references/Level1_basics.md`: レベル1の基礎ガイド- `references/Level2_intermediate.md`: レベル2の実務ガイド- `references/Level3_advanced.md`: レベル3の応用ガイド- `references/Level4_expert.md`: レベル4の専門ガイド- `references/legacy-skill.md`: 旧SKILL.mdの全文- `scripts/log_usage.mjs`: 使用記録・自動評価スクリプト- `scripts/validate-skill.mjs`: スキル構造検証スクリプト

Comprehensive guide for implementing Fullstory's Observer/Callback API (observe method) for web applications. Teaches proper event subscription, callback handling, observer cleanup, and reacting to Fullstory lifecycle events. Includes detailed good/bad examples for session URL capture, initialization handling, and integration with analytics platforms.

運用ランブックの作成・保守スキル。本番システムの障害対応、トラブルシューティング手順、リカバリーワークフロー、運用知識の共有を標準化し、信頼性の高いシステム運用を実現する。Anchors:• Site Reliability Engineering (Google) / 適用: ランブックパターン、ポストモーテム / 目的: 運用の卓越性と信頼性• The Practice of System and Network Administration (Limoncelli) / 適用: 手順書標準化 / 目的: 再現可能な運用• Incident Management for Operations (Mogull) / 適用: インシデント対応 / 目的: 効果的な危機対応Trigger:Use when creating runbooks, documenting incident procedures, standardizing operational workflows,building troubleshooting guides, establishing recovery procedures, improving on-call readiness.runbook, incident response, troubleshooting, recovery procedures, operational documentation, on-call playbook

Orchestrates the creation of a full job application package. Triggers whenever the user shares a new job posting, provides a link/URL, pastes a job description or specification, or uses phrases like "apply for this job", "create application package", or "draft application". Generates CV, cover letter, and tracking files using the Candidate Profile.

Transform product requirements, ideas, or concepts into professional development resources. Use when users request help with product planning, PRD creation, work breakdown, or converting ideas into structured development plans. Triggers include phrases like "create a PRD", "break down this feature", "plan this product", "write requirements", "work breakdown structure", or providing product ideas that need to be formalized into development artifacts.

Investigate noisy/common alerts and create false positive (FP) rules to suppress benign detections. Analyzes detection frequency over 7 days, identifies patterns, generates and tests FP rules with operator approval before deployment. Use for tuning detection noise, reducing alert fatigue, suppressing known-safe activity, or when specific detections need filtering. Human-in-the-loop workflow ensures no FP rules are deployed without explicit approval.

This skill allows Claude to conduct comprehensive security audits of code, infrastructure, and configurations. It leverages various tools within the security-pro-pack plugin, including vulnerability scanning, compliance checking, cryptography review, and infrastructure security analysis. Use this skill when a user requests a "security audit," "vulnerability assessment," "compliance review," or any task involving identifying and mitigating security risks. It helps to ensure code and systems adhere to security best practices and compliance standards.

Provides code formatting best practices and granular edit operation guidelines. Use when formatting code, making edits to files, or when determining the proper approach for code modifications. Emphasizes using external formatting tools and breaking down large modifications into atomic, sequential edits for reliability.

Generate optimized images for Marp slides using Playwright MCP with theme-matching color palettes and guideline-compliant sizes

This skill empowers Claude to perform regression analysis and modeling using the regression-analysis-tool plugin. It analyzes datasets, generates appropriate regression models (linear, polynomial, etc.), validates the models, and provides performance metrics. Use this skill when the user explicitly requests regression analysis, prediction based on data, or mentions terms like "linear regression," "polynomial regression," "regression model," or "predictive modeling." This skill is also helpful when the user needs to understand the relationship between variables in a dataset.

Writing style guide for jonmagic / Jonathan Hoyt with authentic voice patterns and tone guidelines. Use when generating any prose content on jonmagic's behalf—blog posts, documentation, reflections, feedback, snippets, or any written communication. Ensures first-person narratives with introspective framing, concrete examples, and thoughtful principal-engineer perspective.

This skill enables Claude to scan container images and running containers for vulnerabilities using tools like Trivy and Snyk. It identifies potential security risks in container environments. Use this skill when the user requests a security assessment of a container image, asks to identify vulnerabilities in a container, or wants to improve the security posture of their containerized applications. Trigger terms include "scan container," "container security," "vulnerability assessment," "Trivy scan," or "Snyk scan."

統合テストの設計・実装・実行スキル。複数コンポーネント間の相互作用を検証し、エンドツーエンドのワークフローが正しく機能することを確認します。Anchors:• Growing Object-Oriented Software, Guided by Tests (Freeman) / 適用: 境界テスト設計 / 目的: 契約ベースのテスト• Continuous Delivery (Humble) / 適用: パイプライン統合 / 目的: 早期フィードバック• Testing Microservices with Mountebank (Byars) / 適用: サービス仮想化 / 目的: 分散システムテスト効率化Trigger:Use when testing component interactions, database integration, external API connections, or E2E workflows.integration testing, database testing, api testing, contract testing, test isolation

Write markdown content to file paths using the MCP markdown-writer server. Use when you need to save generated markdown content to a file, especially in contexts where (1) The Write tool is unavailable or restricted, (2) You need guaranteed atomic writes with verification, (3) Writing markdown files for documentation, reports, or research outputs, (4) An agent needs to persist markdown without user permission prompts.

Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.

TMDB (The Movie Database) API integration for React Native TV streaming apps. Use when users need help with movie/TV show data, poster images, search functionality, trending content, video trailers from TMDB, API authentication, rate limiting, or TypeScript types for TMDB responses.

Frontend development guidelines for React/TypeScript applications. Modern patterns including Suspense, lazy loading, useSuspenseQuery, file organization with features directory, styling best practices, routing, performance optimization, and TypeScript best practices. Use when creating components, pages, features, fetching data, styling, routing, or working with frontend code.