Install the with-md-share skill.

Codex skills path:
- User/global: ~/.agents/skills/with-md-share/SKILL.md
- Project-local: .agents/skills/with-md-share/SKILL.md

Claude Code skills path:
- User/global: ~/.claude/skills/with-md-share/SKILL.md
- Project-local: .claude/skills/with-md-share/SKILL.md

Run:

mkdir -p ~/.agents/skills/with-md-share ~/.claude/skills/with-md-share .agents/skills/with-md-share .claude/skills/with-md-share
curl -fsSL https://with.md/skill/md -o ~/.agents/skills/with-md-share/SKILL.md
cp ~/.agents/skills/with-md-share/SKILL.md ~/.claude/skills/with-md-share/SKILL.md
cp ~/.agents/skills/with-md-share/SKILL.md .agents/skills/with-md-share/SKILL.md
cp ~/.agents/skills/with-md-share/SKILL.md .claude/skills/with-md-share/SKILL.md

Then print: Skill install complete.