Description

Hi,

I am trying to connect to Mapbox MCP server as per the instructions given in https://docs.mapbox.com/help/tutorials/build-your-own-agent/?step=4, I am getting below error message when running main.py file. Please let me know how to fix this error.

Exception: An error occurred while running the crew: Failed to initialize MCP Adapter: '#/properties/geometry/anyOf/0/items'

Environment details:
Python version: 3.13.11

Thanks,
Naveen

Steps to Reproduce

I am following instructions as per https://docs.mapbox.com/help/tutorials/build-your-own-agent/?step=4 and got the error when running main.py file.

Made 2 changes as per https://docs.mapbox.com/help/tutorials/build-your-own-agent/?step=4

1. Change1 in crew.py:
   mcp_server_params = [
   {
   "url": "https://mcp.mapbox.com/mcp",
   "transport": "streamable-http",
   "headers": {"authorization": f'Bearer {MAPBOX_ACCESS_TOKEN}'} #constant containing Mapbox API key
   }
   ]
2. Change 2 in crew.py:
   Added parameter 'tools=self.get_mcp_tools()' in helpful_agent function.

Expected behavior

The code should connect to MCP server and answer the question.

Screenshots/Code snippets

Code in crew.py:

from crewai import Agent, Crew, Process, Task, LLM
from crewai.project import CrewBase, agent, crew, task
from crewai.agents.agent_builder.base_agent import BaseAgent
from typing import List, Optional, Dict, Any
from pydantic import BaseModel, Field
import os

@crewbase
class DemoProject():
"""DemoProject crew"""

agents: List[BaseAgent]
tasks: List[Task]
MAPBOX_ACCESS_TOKEN="xxxxx"

# Add mcp_server_params list, this is the first change we need to make to enable MCP
mcp_server_params = [
    {
        "url": "https://mcp.mapbox.com/mcp",
        "transport": "streamable-http",
        "headers": {"authorization": f'Bearer {MAPBOX_ACCESS_TOKEN}'}
    }
]
# "headers": {"authorization": f"Bearer {os.environ['MAPBOX_ACCESS_TOKEN']}"}

# Learn more about YAML configuration files here:
# Agents: https://docs.crewai.com/concepts/agents#yaml-configuration-recommended
# Tasks: https://docs.crewai.com/concepts/tasks#yaml-configuration-recommended

# If you would like to add tools to your agents, you can learn more about it here:
# https://docs.crewai.com/concepts/agents#agent-tools
@agent
def helpful_agent(self) -> Agent:
    return Agent(
        config=self.agents_config['helpful_agent'], # type: ignore[index]
        verbose=True,
        tools=self.get_mcp_tools() # This is the second change we are making to enable tools
    )

# To learn more about structured task outputs,
# task dependencies, and task callbacks, check out the documentation:
# https://docs.crewai.com/concepts/tasks#overview-of-a-task
@task
def help_task(self) -> Task:
    return Task(
        config=self.tasks_config['help_task'], # type: ignore[index]
    )


@crew
def crew(self) -> Crew:
    """Creates the DemoProject crew"""
    # To learn how to add knowledge sources to your crew, check out the documentation:
    # https://docs.crewai.com/concepts/knowledge#what-is-knowledge

    return Crew(
        agents=self.agents, # Automatically created by the @agent decorator
        tasks=self.tasks, # Automatically created by the @task decorator
        process=Process.sequential,
        verbose=True,
        # process=Process.hierarchical, # In case you wanna use that instead https://docs.crewai.com/how-to/Hierarchical/
    )

Operating System

Windows 11

Python Version

3.12

crewAI Version

1.9.2

crewAI Tools Version

1.9.2

Virtual Environment

Venv

Evidence

python version: 3.13.11

Copied from error log:

File "....\Lib\site-packages\pydantic\json_schema.py", line 2296, in _add_json_refs
defs_ref = self.json_to_defs_refs[json_ref]
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
KeyError: '#/properties/geometry/anyOf/0/items'

The above exception was the direct cause of the following exception:

File "...\Lib\site-packages\crewai_tools\adapters\mcp_adapter.py", line 125, in init
raise RuntimeError(f"Failed to initialize MCP Adapter: {e}") from e
RuntimeError: Failed to initialize MCP Adapter: '#/properties/geometry/anyOf/0/items'

During handling of the above exception, another exception occurred:

File "....\main.py", line 30, in run
raise Exception(f"An error occurred while running the crew: {e}")
Exception: An error occurred while running the crew: Failed to initialize MCP Adapter: '#/properties/geometry/anyOf/0/items'

Possible Solution

None

Additional context

None