Development

Agent Skills Open Standard
The open SKILL.md format for packaging reusable agent capabilities, originated by Anthropic and now adopted across Codex, Gemini CLI, Grok …
Skills
Artifacts Builder
Structured guidance for building well-formed interactive artifacts — self-contained HTML apps, visualizations, and documents.
Skills
Claude API
Reference for building Claude-powered applications — current model IDs, pricing, streaming, tool use, MCP, and SDK usage patterns, used to …
Skills
Codex Skills System
OpenAI Codex's built-in support for SKILL.md skills, discovered from ~/.codex/skills/ and installable via $skill-installer from a curated …
Skills
Expo Skills
Official skills from the Expo team for developing React Native apps with Expo.
Skills
Gemini CLI Skills System
Gemini CLI's native support for the Agent Skills (SKILL.md) open standard.
Skills
Get Shit Done
Lightweight meta-prompting, context-engineering, and spec-driven development system for Claude Code.
Skills
Google Antigravity Skills System
Google Antigravity's SKILL.md-based capability-extension system, with global and per-project skill scopes.
Skills
Grok Build Skills System
xAI Grok Build's SKILL.md skills system, reading .grok/skills/, plugin skill dirs, and directly Claude Code-compatible.
Skills
Jules Delegate
Delegates coding tasks to Google's Jules AI agent for async bug fixes, docs, tests, and feature implementation on GitHub repos.
Skills
MCP Builder
Scaffolds and structures a new MCP server correctly — protocol handshake, tool definitions, error handling — from a plain description of …
Skills
OpenAI Skills/Plugins Catalog
OpenAI's official curated repository of Codex skills and plugins — Figma, Playwright, Notion, security, deploy targets, and more.
Skills
Security Best Practices Skill
Curated Codex skill encoding secure-coding checklists applied during code generation and review.
Skills
Security Threat Model Skill
Curated Codex skill that walks an agent through producing a structured threat model for a system.
Skills
shadcn/ui Skill
Gives Claude Code direct context on shadcn/ui components plus pattern enforcement for consistent usage.
Skills
Skill Creator
A meta-skill for building, testing, and iterating on other Agent Skills — drafting SKILL.md files, generating test prompts, running evals, …
Skills
Skill Creator (OpenAI)
System skill (auto-installed) that helps scaffold a new SKILL.md-compliant skill for Codex.
Skills
Skill Seekers
Automatically converts any documentation website into a ready-to-use Claude skill.
Skills
Superpowers
Battle-tested library of 20+ Claude Code skills covering TDD, systematic debugging, brainstorming, git worktree management, and root-cause …
Skills
Superpowers Lab
Experimental, actively-evolving companion skills to Superpowers, testing newer techniques before they graduate into the stable library.
Skills
Webapp Testing
Teaches an agent to actually verify a web app in a browser — clicking through flows and checking console output — before calling a task …
Skills