Can I use my ChatGPT, Claude, or Gemini subscription?

Yes, in Studio. Sign in with ChatGPT or Claude, and the agent runs on that subscription instead of an API key. With the NodeTool Chrome extension, NodeTool also uses the ChatGPT or Gemini tab you are signed in to: ChatGPT generates images, and Gemini runs chat, images, and video. Those runs count against your plan's limits, so you get no pay-per-call bill for them. Every run shows up in your ChatGPT or Gemini history.