https://skills.sh/{name} cannot be cloned into .polpo/skills/.
Two installation targets
For the official coding-agent pack, use Coding Agents. For a Polpo runtime agent, install from the source repository and then assign the discovered skill name:
Publish a compatible skill
Put each skill in its own directory and commit the entire bundle:name, description, and allowed-tools. Runtime tags and category are maintained in the project’s .polpo/skills-index.json, not in SKILL.md. See Agent skills for assignment and API details.