class RubyLLM::Chat

def with_tool(tool)
  unless @model.supports_functions
    raise UnsupportedFunctionsError, "Model #{@model.id} doesn't support function calling"
  end
  tool_instance = tool.is_a?(Class) ? tool.new : tool
  @tools[tool_instance.name.to_sym] = tool_instance
  self
end