Create, update, test, and manage Agent Skills. Use when creating new skills, debugging existing ones, or organizing skill libraries. Based on official Claude Code documentation.

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes. Four-phase framework ensuring understanding before attempting solutions.

Comprehensive testing workflow combining TDD, real implementations (no mocking), and E2E testing. Use when implementing features, writing tests, or setting up test infrastructure.

Documentation for the htmx JavaScript library (attributes, events, headers, API, extensions, examples, migration guides, server examples). Use when you need accurate htmx syntax/behavior or to locate the right reference page for an htmx question.

- Prefer attribute/event/header-specific pages over general guides.

Generate high-quality, minimalistic, and geometric SVG logos using Python scripts. Use this skill when users need to create logos, icons, or visual identities with geometric primitives (circles, rects, paths) and specific color schemes. Applies generative design principles with standardized workflows for scalable SVG output.

Verwandelt den Agenten in einen professionellen MV3-Architekten und Entwickler mit Fokus auf AI-Integration, Sicherheit, Performance, Testing und Publishing-Compliance.

/chrome-ai-extension-skill/

Use when creating or editing skills, before deployment, to verify they work under pressure and resist rationalization - applies RED-GREEN-REFACTOR cycle to process documentation by running baseline without skill, writing to address failures, iterating to close loopholes

Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization

NixOS module patterns. Use when creating or editing NixOS/home-manager modules, adding packages, or configuring programs.

Diagnoses and debugs A2A agent communication issues including agent status, message routing, transport connectivity, and log analysis. Use when agents aren't responding, messages aren't being delivered, routing is incorrect, or when debugging orchestrator, coder-agent, tester-agent communication problems.

Build accessible user interfaces using semantic HTML, ARIA attributes, keyboard navigation, color contrast, and screen reader compatibility. Use this skill when creating or modifying HTML templates, React/Vue components, forms, interactive elements, navigation menus, modals, or any UI code. Apply when implementing keyboard navigation, focus management, alt text for images, form labels, heading structure, color contrast, or testing with screen readers. Use for all frontend development to ensure interfaces are usable by people with disabilities and meet WCAG accessibility standards.

Build mobile-first responsive layouts with fluid containers, relative units, standard breakpoints, and touch-friendly design that adapts seamlessly across devices. Use this skill when creating or modifying layouts, implementing media queries, defining breakpoints, choosing sizing units, optimizing for mobile devices, or testing UI across screen sizes. Apply when working with responsive design, mobile layouts, tablet views, desktop views, viewport configuration, or any styling that needs to adapt to different screen sizes and device capabilities.

Implement robust error handling with user-friendly messages, specific exception types, fail-fast validation, centralized error boundaries, graceful degradation, and proper resource cleanup. Use this skill when writing try-catch blocks, raising exceptions, handling API errors, validating input, implementing error boundaries, managing external service failures, or ensuring resource cleanup. Apply when working with error handling code in any language, exception classes, error middleware, API error responses, retry logic, or any code that needs to handle failures gracefully while maintaining system stability and providing clear feedback to users.

Understand and apply project-specific technology choices including frameworks, languages, databases, testing tools, and third-party services to maintain consistency across the stack. Use this skill when making technology decisions, adding new dependencies, choosing libraries/frameworks, configuring build tools, setting up databases, implementing authentication, or integrating third-party services. Apply when working with framework-specific code, package managers, ORM configurations, testing setups, deployment configurations, or any task that requires knowledge of the project's chosen technologies to ensure architectural consistency and avoid introducing conflicting tools or patterns.

Write minimal, focused tests for core user flows and critical paths during development, testing behavior rather than implementation with clear test names and mocked dependencies. Use this skill when writing unit tests, integration tests, test files, test cases for critical workflows, or mocking external dependencies. Apply when working with test files (.test.js, .spec.ts, _test.py), test frameworks (Jest, RSpec, pytest), testing user journeys, or implementing fast-executing tests that validate business-critical functionality without over-testing implementation details or edge cases during feature development.

Enterprise-grade browser automation using WebDriver protocol. Use when the user needs to automate web browsers, perform web scraping, test web applications, fill forms, take screenshots, monitor performance, or execute multi-step browser workflows. Supports Chrome, Firefox, and Edge with connection pooling and health management.

Production-ready patterns and best practices for MCP servers - architecture, security, performance, and maintenance

Guides users on creating mock implementations for testing with traits, providing test doubles, and avoiding tight coupling to test infrastructure. Activates when users need to test code with external dependencies.

Introduces property-based testing with proptest, helping users find edge cases automatically by testing invariants and properties. Activates when users test algorithms or data structures.

Quick start guide for creating MCP servers with the rmcp crate - installation, concepts, and first server

Type-driven design patterns in Rust - typestate, newtype, builder pattern, and compile-time guarantees

Setup instructions for this project

**Goal**: Create comprehensive PRDs, tech specs, and ux specs based on feature requirements

Generate structured, actionable task roadmaps from project specifications (PRD, Tech Specs, UI/UX Specs).

Test-Driven Development (TDD) using Vitest and TypeScript. Use when the user requests help with TDD, writing tests before code, test-first development, Vitest test setup, TypeScript testing patterns, unit testing, integration testing, or following the Red-Green-Refactor cycle with Vitest.

Create single-file HTML prototypes focused on validating user flows, interaction patterns, and information architecture. Prioritize UX fidelity over visual polish.

Formats and prettifies JSON with configurable indentation

Browser automation tool using Playwright - captures screenshots and extracts content from web pages

Analyzes text and provides word count, character count, and sentence statistics

Tests error visibility for build step failures

A tool that echoes its input for testing

A test tool that fails with visible output

Basic git operations for repository inspection. Use for git diff, git log, git status, git remote, and other read-only git commands.

Guide for setting up and using Firebase Authentication. Use this skill when the user's app requires user sign-in, user management, or secure data access using auth rules.

The definitive, foundational skill for ANY Firebase task. Make sure to ALWAYS use this skill whenever the user mentions or interacts with Firebase, even if they do not explicitly ask for it. This skill covers everything from the bare minimum INITIAL setup (Node.js setup, Firebase CLI installation, first-time login) to ongoing operations (core principles, workflows, building, service setup, executing Firebase CLI commands, troubleshooting, refreshing, or updating an existing environment).

firecrawl-map

firecrawl-scrape

firecrawl-search

Generate walkthrough videos from Stitch projects using Remotion with smooth transitions, zooming, and text overlays

Unified entry point for Stitch design work. Handles prompt enhancement (UI/UX keywords, atmosphere), design system synthesis (.stitch/DESIGN.md), and high-fidelity screen generation/editing via Stitch MCP.

Google Tasks: Manage task lists and tasks.

Write follow-up emails that re-engage without being annoying. Uses proven psychology for follow-up sequences. 42% of replies come from follow-ups.

Batteries-included agent component from [ui.inference.sh](https://ui.inference.sh).

Create AI marketing videos for ads, promos, product launches, and brand content. Models: Veo, Seedance, Wan, FLUX for visuals, Kokoro for voiceover. Types: product demos, testimonials, explainers, social ads, brand videos. Use for: Facebook ads, YouTube ads, product launches, brand awareness. Triggers: marketing video, ad video, promo video, commercial, brand video, product video, explainer video, ad creative, video ad, facebook ad video, youtube ad, instagram ad, tiktok ad, promotional video, launch video

Chat building blocks from [ui.inference.sh](https://ui.inference.sh).

Product Hunt launch optimization with specific specs, timing, and gallery strategy. Covers taglines, gallery images, maker comments, and launch day tactics. Use for: product launches, startup launches, side project launches, Product Hunt optimization. Triggers: product hunt, ph launch, product hunt launch, launch strategy, product launch, startup launch, product hunt tips, product hunt gallery, ph optimization, launch day, product hunt maker

Technical blog post writing with structure, code examples, and developer audience conventions. Covers post types, code formatting, explanation depth, and developer-specific engagement patterns. Use for: engineering blogs, dev tutorials, technical writing, developer content, documentation posts. Triggers: technical blog, dev blog, engineering blog, technical writing, developer tutorial, tech post, code tutorial, programming blog, developer content, technical article, engineering post, coding tutorial, technical content

Tool lifecycle components from [ui.inference.sh](https://ui.inference.sh).