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Select an AI to open its chat in a new tab:
A skill is a set of instructions that controls how the AI writes. Skills work only in the AI tabs that use your own API key: Claude, ChatGPT and More AIs. Add your key in Settings. Each of these tabs gives each skill that is on to the AI on each turn. CollabAI does not use your skills, also when it uses your own key. The one exception is its Writing Assistant, which always follows the text of the Socratic writing coach skill. Collab Writer does not give your skills to an AI that you connect through MCP, for example the Paper agent. That AI can ask for your skills, but nothing makes it follow them. To use a skill in the Claude app or the ChatGPT app, download the skill and install it there.
How to use a skill in the Claude app or the ChatGPT app
Download gives you a .zip file that holds the skill folder in the format that both apps use. You do not have to rename, unzip or edit it.
Claude. Select Customize ▸ Skills ▸ + ▸ Create skill ▸ Upload a skill, then select the .zip file. Claude uses an enabled skill when it finds the skill relevant. To make sure that Claude uses it, start your first message with /skill-name.
ChatGPT. Select Sidebar ▸ Plugins ▸ Skills tab ▸ Create ▸ Upload from your computer, then select the .zip file. ChatGPT scans an uploaded skill, then uses it when it helps. You do not type a command. Personal skills need a Business, Enterprise, Healthcare or Edu plan.
When you open a skill, its pane gives the two other formats: the .md skill file alone, and a .txt file with only the instruction text. + Upload reads all three formats, so you can also bring a skill from Claude or ChatGPT here.