How to use Gemini's url_context?

[gnumoksha]

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Example Code

from google.ai.generativelanguage_v1beta.types import Tool as GenAITool
from langchain_core.messages import HumanMessage
from langchain_google_genai import ChatGoogleGenerativeAI

chat_model = ChatGoogleGenerativeAI(model="gemini-2.5-flash", google_api_key="foo")

# Generates the error:
# ValueError: Unknown field for Tool: url_context
result = chat_model.invoke(
    [
        HumanMessage(
            content="Can you access this url? https://python.langchain.com/docs/integrations/chat/google_generative_ai/#built-in-tools"
        )
    ],
    tools=[GenAITool(url_context={})],
)

print(result)

Description

I'm trying to use Gemini's url_context with LangChain. I've read the LangChain documentation, but I was unable to use the url_context because of the error described above in the code snippet.

System Info

$ pip freeze | grep -i langchain
langchain==0.3.26
langchain-anthropic==0.3.17
langchain-core==0.3.68
langchain-google-genai==2.1.6
langchain-openai==0.3.27
langchain-text-splitters==0.3.8