Guides

Each guide quotes its sources and the date we checked them.

• AGENTS.md vs SKILL.md: what goes where, and how Claude Code, Codex, Copilot and Cursor read each (2026)
  AGENTS.md holds project instructions an agent reads at the start of every task. SKILL.md holds one task playbook that loads when the task comes up. What to put in each, plus the load rules for Claude Code, Codex, Copilot and Cursor.
• Best Claude Code skills for Next.js: 3 free picks and how to install them (2026)
  3 open-license Claude Code skills for Next.js App Router projects, the install command for each, where Claude Code loads them, and how to get a list matched to your repo.
• Best Claude Code skills for Python: 6 free picks and how to install them (2026)
  6 open-license Claude Code skills for Python: idioms, anti-patterns, pytest, type hints, uv and code review. The install command for each and where Claude Code loads them.
• Claude Code frontend design skill: how to install it, plus 4 more UI picks (2026)
  How to install Anthropic's frontend-design skill for Claude Code, plus 4 open-license UI and design review skills with install lines. Our database tags 5,380 skills for frontend design.
• Claude Code Playwright skill: 5 picks and how to install them (2026)
  5 open-license Playwright skills for Claude Code from OpenAI, Anthropic, GitHub and LambdaTest, with install lines, and when to use a skill versus Playwright MCP. Our database tags 500 Playwright skills.
• Claude Code security skills: 5 free picks for security review and scans (2026)
  5 open-license Claude Code skills for security review, audits and scans, from Sentry, OpenAI, Trail of Bits and Anthropic, with install lines. Our database tags 8,736 skills for security.
• Claude Code skills for code review: 5 free picks with install commands (2026)
  5 open-license Claude Code skills for code review and PR review, from Sentry, Anthropic and Trail of Bits, with the install line for each. Our database tags 11,365 skills for code review.
• Claude Code skills for React and React Native: 6 free picks (2026)
  6 open-license Claude Code skills for React, TypeScript, React Native and Expo, with the install command for each, where Claude Code loads them, and how to pick for your repo.
• Claude Code skills for testing: TDD, unit and web app test picks (2026)
  5 open-license Claude Code skills for testing: test-driven development, web app tests, test gap audits, mutation tests and Vitest. Our database tags 10,087 skills for testing.
• Claude skills vs MCP servers: what each one does and when to use both (2026)
  Skills teach an agent how to do a task. MCP servers give it tools and data. How they differ in Claude Code and Codex, what each costs in context, and where plugins fit.
• Codex skills: where Codex loads them, how to install, and how to use Claude skills in Codex (2026)
  Codex reads SKILL.md skills from .agents/skills in your repo and home folder. Folder locations, install commands, how to call a skill with $, and how to reuse Claude Code skills.
• Cursor rules for Next.js: 5 free .mdc rule files with install lines (2026)
  5 open-license Cursor rule files for Next.js projects, with a one-line install for each. Our database holds 104 Cursor rules tagged Next.js, out of 965 rules in all.
• Cursor rules for Python: 5 free .mdc rule files with install lines (2026)
  5 open-license Cursor rule files for Python projects, with a one-line install for each. Our database holds 130 Cursor rules tagged Python, out of 965 rules in all.
• Cursor rules for React: 5 free .mdc rule files with install lines (2026)
  5 open-license Cursor rule files for React projects, with a one-line install for each. Our database holds 102 Cursor rules tagged React, out of 965 rules in all.
• Cursor rules vs agent skills: which to use, and how to move rules to skills (2026)
  Cursor reads .mdc rules from .cursor/rules and SKILL.md skills from .agents/skills or .cursor/skills. How each one loads, when to pick which, and how to convert rules with /migrate-to-skills.
• Gemini CLI skills: where they live, how to install them, and 3 to try (2026)
  How Gemini CLI agent skills work: the skills folders, gemini skills install, the /skills commands, how to write a SKILL.md, and 3 open-license skills from GitHub to try.
• How to install Claude Code skills: folders, GitHub, and global installs (2026)
  Install Claude Code skills three ways: copy a SKILL.md folder, run npx skills add from GitHub, or add a plugin. Where each one loads, and how to check it worked.
• SKILL.md format: fields, folder layout, and a template you can copy (2026)
  The SKILL.md format from the Agent Skills spec: required name and description, optional fields, folder layout, size limits, and the extra fields Claude Code and Codex read.