Thank you for your contribution with the commit Make TextInspectorTool serializable #1176.

    return self.to_dict()["code"]
  File "/home/MathModeling/smolagents/src/smolagents/tools.py", line 226, in to_dict
    raise (ValueError("\n".join(method_checker.errors)))
ValueError: Name 'mimetypes' is undefined.
Name 'encode_image' is undefined.
Name 'encode_image' is undefined.
Name 'mime_type' is undefined.
Name 'requests' is undefined.
Name 'headers' is undefined.

However, I believe the issue I'm encountering might be more complex than just TextInspectorTool serialization. I'm currently using smolagents-1.14.0.dev0 and experiencing errors when trying to save the agent state, with undefined names like 'mimetypes', 'encode_image', and 'requests' being reported.

The reproduction code is in run.py, which demonstrates this behavior when attempting to save the agent after execution. The error occurs during the tool serialization process, suggesting there might be missing imports or dependencies in the serialization logic beyond just the TextInspectorTool.

import argparse
import os
import threading

os.environ['SERPAPI_API_KEY']="empty"
os.environ['SERPER_API_KEY']="empty"

from dotenv import load_dotenv
from huggingface_hub import login
from scripts.text_inspector_tool import TextInspectorTool
from scripts.text_web_browser import (
    ArchiveSearchTool,
    FinderTool,
    FindNextTool,
    PageDownTool,
    PageUpTool,
    SimpleTextBrowser,
    VisitTool,
)
from scripts.visual_qa import visualizer

from smolagents import (
    CodeAgent,
    GoogleSearchTool,
    # HfApiModel,
    # LiteLLMModel,
    OpenAIServerModel,
    ToolCallingAgent,
)


AUTHORIZED_IMPORTS = [
    "requests",
    "zipfile",
    "os",
    "pandas",
    "numpy",
    "sympy",
    "json",
    "bs4",
    "pubchempy",
    "xml",
    "yahoo_finance",
    "Bio",
    "sklearn",
    "scipy",
    "pydub",
    "io",
    "PIL",
    "chess",
    "PyPDF2",
    "pptx",
    "torch",
    "datetime",
    "fractions",
    "csv",
]
load_dotenv(override=True)
# login(os.getenv("HF_TOKEN"))

append_answer_lock = threading.Lock()


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--question", type=str, help="for example: 'How many studio albums did Mercedes Sosa release before 2007?'"
    )
    parser.add_argument("--model-id", type=str, default="o1")
    return parser.parse_args()


custom_role_conversions = {"tool-call": "assistant", "tool-response": "user"}

user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36 Edg/119.0.0.0"

BROWSER_CONFIG = {
    "viewport_size": 1024 * 5,
    "downloads_folder": "downloads_folder",
    "request_kwargs": {
        "headers": {"User-Agent": user_agent},
        "timeout": 300,
    },
    "serpapi_key": os.getenv("SERPAPI_API_KEY"),
}

os.makedirs(f"./{BROWSER_CONFIG['downloads_folder']}", exist_ok=True)


def create_agent(model_id="o1"):
    model_params = {
        "model_id": model_id,
        "custom_role_conversions": custom_role_conversions,
        "api_base": "http://localhost:8123/v1",
        "api_key": "empty",
        "flatten_messages_as_text": True,
    }
    if model_id == "o1":
        model_params["reasoning_effort"] = "high"
    # model = LiteLLMModel(**model_params)
    model = OpenAIServerModel(**model_params)

    text_limit = 100000
    browser = SimpleTextBrowser(**BROWSER_CONFIG)
    WEB_TOOLS = [
        # GoogleSearchTool(provider="serper"),
        # VisitTool(browser),
        # PageUpTool(browser),
        # PageDownTool(browser),
        # FinderTool(browser),
        # FindNextTool(browser),
        # ArchiveSearchTool(browser),
        TextInspectorTool(model, text_limit),
    ]
    text_webbrowser_agent = ToolCallingAgent(
        model=model,
        tools=WEB_TOOLS,
        max_steps=20,
        verbosity_level=2,
        planning_interval=4,
        name="search_agent",
        description="""A team member that will search the internet to answer your question.
    Ask him for all your questions that require browsing the web.
    Provide him as much context as possible, in particular if you need to search on a specific timeframe!
    And don't hesitate to provide him with a complex search task, like finding a difference between two webpages.
    Your request must be a real sentence, not a google search! Like "Find me this information (...)" rather than a few keywords.
    """,
        provide_run_summary=True,
    )
    text_webbrowser_agent.prompt_templates["managed_agent"]["task"] += """You can navigate to .txt online files.
    If a non-html page is in another format, especially .pdf or a Youtube video, use tool 'inspect_file_as_text' to inspect it.
    Additionally, if after some searching you find out that you need more information to answer the question, you can use `final_answer` with your request for clarification as argument to request for more information."""

    manager_agent = CodeAgent(
        model=model,
        tools=[visualizer, TextInspectorTool(model, text_limit)],
        max_steps=12,
        verbosity_level=2,
        additional_authorized_imports=AUTHORIZED_IMPORTS,
        planning_interval=4,
        managed_agents=[text_webbrowser_agent],
    )

    return manager_agent


def main():
    args = parse_args()

    agent = create_agent(model_id=args.model_id)

    answer = agent.run(args.question)
    agent.save('/home/tmp/')

    print(f"Got this answer: {answer}")


if __name__ == "__main__":
    main()

Originally posted by @YiFraternity in #1162