What it is: goose is the only agent in this set governed by a foundation rather than a vendor, and it can borrow an existing Claude, ChatGPT or Gemini subscription over the Agent Client Protocol instead of an API key. [github.com/aaif-goose/goose]
Choose Goose when: Automate work that is not coding — research, writing, data analysis — on the same machine and the same agent, through the desktop app, the CLI or the API. [github.com/aaif-goose/goose]
Where it hurts: Model choice is not free: goose leans on tool calling, so a weak or local model degrades it, and the vendor names Claude 4 as the model it works best with. [goose-docs.ai/docs/getting-started]
Price: goose charges nothing for itself; you pay whichever provider you configure, and it accepts a ChatGPT Plus or Pro subscription in place of an API key. [goose-docs.ai/docs/getting-started]