[BUG] Manager agent with kickoff_for_each is leading to '3 validation errors for Crew'

[cb-fhillenbrand]

Description

By creating a crew with a manager agent and using the kickoff_for_each function, the execution stops with the following issue:

.venv/lib/python3.12/site-packages/pydantic/functional_validators.py:787: UserWarning: Pydantic serializer warnings:
  Expected `InstanceOf` but got `CrewAgentExecutor` with value `<crewai.agents.crew_agent...bject at 0x7f213dc6c1d0>` - serialized value may not be as expected
  function=lambda v, h: h(v), schema=original_schema
3 validation errors for Crew
manager_agent.id
  This field is not to be set by the user. [type=may_not_set_field, input_value=UUID('29858c29-f8d3-491b-b347-3d4405847131'), input_type=UUID]
manager_agent.agent_executor
  Input should be an instance of InstanceOf [type=is_instance_of, input_value=<crewai.agents.crew_agent...bject at 0x7f213dc6c1d0>, input_type=CrewAgentExecutor]
    For further information visit https://errors.pydantic.dev/2.10/v/is_instance_of
manager_agent.cache_handler
  Input should be an instance of CacheHandler [type=is_instance_of, input_value={}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.10/v/is_instance_of

The issue does not occur on using kickoff() or using a manager_llm instead of an agent.

Steps to Reproduce

Execute the following code:

import os
import json
from typing import List
from azure.identity import DefaultAzureCredential
from crewai import Agent, Task, Crew, Process
from crewai.crews.crew_output import CrewOutput

# Define your agents
researcher = Agent(
    role="Researcher",
    goal="Conduct thorough research and analysis on AI and AI agents",
    backstory="You're an expert researcher, specialized in technology, software engineering, AI, and startups. You work as a freelancer and are currently researching for a new client.",
    allow_delegation=False
)

writer = Agent(
    role="Senior Writer",
    goal="Create compelling content about AI and AI agents",
    backstory="You're a senior writer, specialized in technology, software engineering, AI, and startups. You work as a freelancer and are currently writing content for a new client.",
    allow_delegation=False
)

# Define your task
task = Task(
    description="Generate a list of 5 interesting ideas for an article, then write one captivating paragraph for each idea that showcases the potential of a full article on this topic. Return the list of ideas with their paragraphs and your notes.",
    expected_output="5 bullet points, each with a paragraph and accompanying notes.",
)

# Define the manager agent
manager = Agent(
    role="Project Manager",
    goal="Efficiently manage the crew and ensure high-quality task completion",
    backstory="You're an experienced project manager, skilled in overseeing complex projects and guiding teams to success. Your role is to coordinate the efforts of the crew members, ensuring that each task is completed on time and to the highest standard.",
    allow_delegation=True
)

# Instantiate your crew with a custom manager
crew = Crew(
    agents=[researcher, writer],
    tasks=[task],
    manager_agent=manager,
    process=Process.hierarchical,
    verbose=True
)


with open('bar.json') as f:
    d = json.load(f)

try:
    outputs: List[CrewOutput] | None = crew.kickoff_for_each(inputs=[
        {"document": document} for document in d["foo"]
    ])
except Exception as e:
    print(f"{e}")

Expected behavior

The example crew is run for each child of the json element "foo" within the file bar.json

Screenshots/Code snippets

See "Steps to reproduce"

Operating System

Ubuntu 20.04

Python Version

3.12

crewAI Version

0.102.0

crewAI Tools Version

0.36.0

Virtual Environment

Venv

Evidence

Possible Solution

None

Additional context

None

[Vidit-Ostwal]

This is primary because of improper deep copy of crew made for each kickoff