Load testing, contract testing, chaos engineering, mutation testing, and resilience verification specialist. Use when system limit verification, non-functional testing, or reliability validation is needed.

Proposes new features leveraging existing data/logic as Markdown specifications. Use when brainstorming new features, product planning, or feature proposals are needed. Does not write code.

Build-first product delivery engine. Delivers working code fastest via minimum agent chains scoped to the task. S/M scopes skip planning and build immediately.

Detection Engineering agent. Designs Sigma/YARA rules, maps detection coverage, designs threat hunting hypotheses, executes Purple Team Blue side, and integrates Detection-as-Code CI/CD. Use when defensive security verification is needed.

YAGNI verification, scope cutting, pruning, and complexity reduction proposals. A 'subtraction' agent that questions the justification for every code, feature, process, document, design, spec, dependency, and config. Does not write code.

E2E testing specialist. Handles Playwright/Cypress/WebdriverIO configuration, Page Object design, auth flows, parallel execution, visual regression, a11y testing, and CI integration. Validates entire user journeys. Use when E2E test creation is needed.

Tech blog/article series authoring for note/Zenn/Qiita/dev.to. Not for specs (Scribe) or microcopy (Prose).

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ML Engineer — model deployment, MLOps pipeline, feature store, model monitoring, A/B testing, production ML system design

Setup Ubuntu server Nginx fail2ban backup monitoring disaster recovery — sysadmin ครบมือ

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Discover and execute specialized skills from a curated marketplace catalog on GitHub, fetched on-demand and run ephemerally (no permanent installation). The catalog covers a broad and growing range — document generation (PDF/Word/Excel/PowerPoint), visual design, presentations, web app testing, animated GIFs, dev tooling (MCP scaffolding, frontend components), creative outputs (algorithmic art), technical documentation lookup (library/API/framework references), and more. Consult this skill whenever the user asks for a capability that could plausibly be covered by a community skill — the catalog is the source of truth, not this description.

Fetch up-to-date library, framework, and SDK documentation via Context7's search and docs endpoints. Use when the user asks about a library/API (React, Next.js, Prisma, Supabase, Tailwind, Django, Vue, etc.) and you need current docs, not Claude's training-time knowledge. Skip this skill for generic programming questions that don't require library-specific docs.

Helps detection engineers identify coverage blind spots in system command execution detection rules, evaluate bypass risks, and reduce false negatives. Strictly limited to system command execution rules; not applicable to browser credential theft or abnormal process creation without command semantics.

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Comprehensive guide for contributing to WordPress core development, including environment setup, coding standards, hooks system, database API, REST API, testing, and Trac workflow.

Comprehensive guide for developing WebExtensions (browser extensions) for Mozilla Firefox, including Manifest V2/V3 configuration, all WebExtension APIs, security practices, web-ext CLI, and AMO submission.

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Comprehensive guide for developing MailExtensions for Mozilla Thunderbird, including Manifest V2/V3 configuration, all messenger.* APIs, UI actions, Experiment APIs, and ATN submission.

BPCore Engine - Lua game framework for Gameboy Advance with sprites, tilemaps, entities, collision, audio, multiplayer

Django Bolt - Rust-powered high-performance API framework, 60k+ RPS, decorator routing, built-in auth, async ORM

Visual regression testing using Playwright with toHaveScreenshot(), masking, thresholds, cross-browser testing, and VUDA integration for AI-powered visual analysis

PyQt/PySide6 overview hub - installation, comparison, project structure. See sub-skills for detailed topics.