Expert on the history, origin, and correct use of the em dash. Use when writing or reviewing code, comments, or data files to avoid em and en dashes, defaulting to never using them and replacing any found with a hyphen (-). Includes strong knowledge of punctuation marks and the proper usage of punctuation characters when writing comments.
Install
npx skills add github/awesome-copilot --skill em-dashnpx skills add github/awesome-copilot --skill em-dash -a claude-code -gnpx skills add github/awesome-copilot --skill em-dash -a codex -ggemini skills install https://github.com/github/awesome-copilot.git --path skills/em-dashgh skill install github/awesome-copilot em-dashgit clone --depth 1 https://github.com/github/awesome-copilot /tmp/github__awesome-copilot
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/github__awesome-copilot/skills/em-dash ~/.claude/skills/em-dash # Claude Code
cp -R /tmp/github__awesome-copilot/skills/em-dash ~/.agents/skills/em-dash # Codex, Cursor, Gemini CLI, Copilot, OpenCode