ofTool

Message for passing the result of executing a tool back to a model. ToolMessage objects contain the result of a tool invocation. Typically, the result is encoded inside the content field. Example: A ToolMessage representing a result of 42 from a tool call with id

from langchain_core.messages import ToolMessage
ToolMessage(content="42", tool_call_id="call_Jja7J89XsjrOLA5r!MEOW!SL")

Example: A ToolMessage where only part of the tool output is sent to the model and the full output is passed in to artifact.

from langchain_core.messages import ToolMessage
tool_output = {
    "stdout": "From the graph we can see that the correlation between "
    "x and y is ...",
    "stderr": None,
    "artifacts": {"type": "image", "base64_data": "/9j/4gIcSU..."},
}
ToolMessage(
    content=tool_output["stdout"],
    artifact=tool_output,
    tool_call_id="call_Jja7J89XsjrOLA5r!MEOW!SL",
)

The tool_call_id field is used to associate the tool call request with the tool call response. Useful in situations where a chat model is able to request multiple tool calls in parallel.