Support sending the messages array to a tool's execute function

[mauricekleine]

Feature Description

I'm using LLMs as tools for a generic task agent that delegates tasks to tools. In order for each LLM tool to have access to the context of the agent execution chain, it would be great if each tool has access to the messages array so far. So let's say I set maxSteps to 5, then the initial call to my streamText method would contain the original messages array send by useChat. It would then determine which tool to use (toolChoice is set to true) and execute that tool - which in my case is another LLM call with it's own prompt:

export const myTool = tool({
    description: '',
    execute: async ({ description, title }) => {
        const result = await generateText({
            description, '',
	    messages , // <== this is currently missing
	    model: vertex,
	    system: '',
        });

         return { text: result.text };
    },
    parameters: z.object({ ... })
});

But the context of the message history between tools gets lost since the tools don't have access to the messages array, including the results of previous tool executions.

Use Case

No response

Additional context

No response

[Slyracoon23]

This would be extremely useful +1