async def go_back(state: AgentState):
    """Goes back to the previous page by calling window.history.back() and waiting for a known element."""
    page = state["page"]
    # Trigger back navigation via JavaScript.
    previous_page = page.url
    await page.evaluate("window.history.back()")
    # Wait a bit for the navigation to complete.
    # Optionally, you can wait for a specific selector you expect on the previous page:
    # await page.wait_for_selector("css=selector-of-known-element", timeout=30000)
    await page.wait_for_timeout(5000)
    current_page = page.url
    return {"actions_taken": [f"Navigated back to {current_page} from {previous_page}"]}
Goes back to the previous page by calling window.history.back() and waiting for a known element.
backend/app/deep_research_agent.py