| webapp-testingToolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs. | Anthropic173,396 source stars | Agent Skills · Claude Code | scriptsFree · source hosted | |
| mcp-builderGuide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK). | Anthropic173,396 source stars | Agent Skills · Claude Code | scripts · referencesFree · source hosted | |
| frontend-designGuidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults. | Anthropic173,396 source stars | Agent Skills · Claude Code | Instructions onlyFree · source hosted | |
| threat-modelUse when Codex is already in the threat-modeling phase of a security scan, the user explicitly invokes $threat-model, or the user explicitly asks to create, update, or persist a repository threat model. Do not use as the primary trigger for full PR, commit, branch, patch, or repository scans. | OpenAI5,357 source stars | Agent Skills · Codex | Instructions onlyFree · source hosted | |
| shadcnManages shadcn components and projects — adding, searching, fixing, debugging, styling, and composing UI. Provides project context, component docs, and usage examples. Applies when working with shadcn/ui, component registries, presets, --preset codes, or any project with a components.json file. Also triggers for "shadcn init", "create an app with --preset", or "switch to --preset". | OpenAI5,357 source stars | Agent Skills · Codex | assetsFree · source hosted | |
| frontend-app-builderUse for new frontend applications, dashboards, games, creative websites, hero sections, and visually driven UI from scratch, or when the user explicitly asks for a redesign/restyle/modernization. Builds from clean, airy, high-taste, readable image-generated concept design with section-specific references, faithful implementation, and browser testing. | OpenAI5,357 source stars | Agent Skills · Codex | referencesFree · source hosted | |