ValidationError: Input should be a valid dictionary or instance of BaseTool

[rokbenko]

@josh-lane

search = DuckDuckGoSearchRun()

You’re still initializing the tool without extending the BaseTool class by defining a subclass. Remove this line completely.

@josh-lane

tools=[search]

You’re still setting the tool parameter incorrectly.

@josh-lane

class MyCustomTool(BaseTool):
    name: str = "Name of my tool"
    description: str = "Clear description for what this tool is useful for, your agent will need this information to use it."

    def _run(self, argument: str) -> str:
        # Implement DuckDuckGoSearchRun here

        return "Result from custom tool"

Also, you didn’t implement the tool. You just copy-pasted my code from the answer above.

Try the following:

from crewai.tools import BaseTool
from langchain_community.tools import DuckDuckGoSearchRun

class MyCustomDuckDuckGoTool(BaseTool):
    name: str = "DuckDuckGo Search Tool"
    description: str = "Search the web for a given query."

    def _run(self, query: str) -> str:
        duckduckgo_tool = DuckDuckGoSearchRun()
        
        response = duckduckgo_tool.invoke(query)

        return response

Then set the tools parameter as follows:

tools=[MyCustomDuckDuckGoTool()]