bind_tools

A list of tool definitions to bind to this chat model.

Can be a pydantic model, Callable, or BaseTool. Pydantic models, Callable, and BaseTool objects will be automatically converted to their schema dictionary representation.

Tools with Union types in their arguments are now supported and converted to anyOf schemas.

Optional tool configuration for additional settings like retrieval_config (for Google Maps/Google Search grounding).

Can be used together with tool_choice, but cannot specify function_calling_config in tool_config if tool_choice is also provided (they would conflict).

from langchain_google_genai import ChatGoogleGenerativeAI

model = ChatGoogleGenerativeAI(model="gemini-2.5-pro")

response = model.invoke(
    "What Italian restaurants are near here?",
    tools=[{"google_maps": {}}],
    tool_choice="required",
    tool_config={
        "retrieval_config": {
            "lat_lng": {
                "latitude": 48.858844,
                "longitude": 2.294351,
            }
        }
    },
)

Control how the model uses tools.

Options:

• 'auto' (default): Model decides whether to call functions
• 'any' or 'required': Model must call a function (both are equivalent)
• 'none': Model cannot call functions
• 'function_name': Model must call the specified function
• ['fn1', 'fn2']: Model must call one of the specified functions
• True: Same as 'any'

Can be used together with tool_config to control function calling while also providing additional configuration like retrieval_config.

Any additional parameters to pass to the Runnable constructor.