Calling an agent: returns a tool call without iterating

import { Agent } from "@mastra/core/agent";
import { RuntimeContext } from "@mastra/core/runtime-context";
const fileExplorerAgent = new Agent({
    model: "mistral/ministral-3b-latest",
    instructions: `
    You are a file explorer agent.
    Answer user questions about a folder.
    You are provided tools to scan the folder, list files, dive into nested folders.
    Use the appropriate tools to answer questions.
    `,
    name: "file-explorer",
    tools: [scanFolder],
    defaultGenerateOptions: {
        maxSteps: 10
    }
})
    const runtimeContext = new RuntimeContext<{ rootFolder: string }>()
    runtimeContext.set("rootFolder", rootFolder)
    const msg = await fileExplorerAgent.generate([
        {
            role: "user",
            content: prompt
        },
    ], { runtimeContext })
    console.log("File Explorer says:", msg.text, msg.toolCalls)