Developer tools

Looking for prompt library tools that actually give you prompts, patterns, or prompt starters to copy and paste? These are the best prompt-library websites for developers in 2026, including 21st.dev, PromptDen, AIPRM, PromptHub, PromptHero, Snack Prompt, and PromptBase.

Discover what AI agent skills are, how they work, and the top 14 must-know skills for developers - including Grill Me, Caveman, TDD, and Graphify. Learn how to install and use skills in Claude Code, Cursor, Codex CLI, and other AI coding agents.