Build a Hugging Face Space via https://github.com/huggingface/skills/tree/main/skills/huggingface-spaces

1. Check the hf CLI is installed with hf --version. If not, install it: curl -LsSf https://hf.co/cli/install.sh | bash
2. Login with hf auth login — it prints a URL + code. Unless you're running fully autonomously (can open a browser and type yourself), ask the user to open the URL and enter the code.
3. Install the skill: hf skills add huggingface-spaces --claude --global, then use it. If the skill isn't invokable to use when just installed, follow how to build a Space directly from https://github.com/huggingface/skills/tree/main/skills/huggingface-spaces and the UI is just a "paste this into your agent curl https://huggingface.co/new-space/agents.md <instructions on what space you want to build>"

If the user didn't instruct you what demo to build, please ask them what demo to build as a next step once the above is set