Tool Key error in YAML

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from crewai import Agent, Crew, Task, Process
from crewai.project import CrewBase, agent, task, crew, tool, llm
from crewai.agents.agent_builder.base_agent import BaseAgent
from crewai.tools import BaseTool
from typing import List

@CrewBase
class YourCrewName:
    """Description of your crew"""

    agents: List[BaseAgent]
    tasks: List[Task]

    agents_config = 'config/agents.yaml'
    tasks_config = 'config/tasks.yaml'

    @agent
    def clown(self) -> Agent:
        return Agent(
            config=self.agents_config['clown'], # type: ignore[index]
            verbose=True
        )

    @task
    def joke_task(self) -> Task:
        return Task(
            config=self.tasks_config['joke_task'] # type: ignore[index]
        )

    #
    # 👇👇👇
    #
    @tool
    def JokerTool(self) -> BaseTool:
        return JokerTool()

    @crew
    def crew(self) -> Crew:
        return Crew(
            agents=self.agents,
            tasks=self.tasks,
            process=Process.sequential,
            verbose=True,
        )

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