Writes and reviews system prompts for AI tools, agents, chatbots, and LLM products using a fixed section order and a quality checklist. Use when drafting a system prompt or auditing one for missing stop criteria, tool rules, constraints, or examples. Not for compressing an existing prompt; use improving-prompts.
Install
npx skills add bostonaholic/skills --skill writing-system-promptsnpx skills add bostonaholic/skills --skill writing-system-prompts -a claude-code -gnpx skills add bostonaholic/skills --skill writing-system-prompts -a codex -ggemini skills install https://github.com/bostonaholic/skills.git --path skills/productivity/writing-system-promptsgh skill install bostonaholic/skills writing-system-promptsgit clone --depth 1 https://github.com/bostonaholic/skills /tmp/bostonaholic__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/bostonaholic__skills/skills/productivity/writing-system-prompts ~/.claude/skills/writing-system-prompts # Claude Code
cp -R /tmp/bostonaholic__skills/skills/productivity/writing-system-prompts ~/.agents/skills/writing-system-prompts # Codex, Cursor, Gemini CLI, Copilot, OpenCode