We can definitely make the docs more clear here but the model requires using the computer_use tool. If you have custom tools, you'll need to exclude predefined tools if they clash with our action space.

See this section: https://googledevai.devsite.corp.google.com/gemini-api/docs/...

And the repo has a sample setup for using the default computer use tool: https://github.com/google/computer-use-preview