Prompt Engineering Skill

A comprehensive reference for writing production-quality prompts for LLM-based agents and assistants. Based on analysis of system prompts from OpenAI (GPT-5, Codex CLI), Anthropic (Claude Opus/Sonnet, Claude Code v2.0), Google (Gemini, Gemini CLI), xAI (Grok), Mistral (Le Chat), and 10+ agentic tools (Cursor, Windsurf, Devin, Manus, Copilot, Cline, Kiro, Aider, pi-coding-agent, OpenCode).

How to use this skill

This skill is organized into modules. Read the relevant module(s) for your task — don't load everything at once.

Before writing any prompt, read references/01-system-prompts.md. It covers the universal anatomy of a system prompt and patterns that apply regardless of use case.

Then read the module(s) specific to your task: