[rfc] core: make tool_call_id optional

[vbarda]

This would allow tools to return ToolMessage directly from the tools, and populate it with additional fields. For example, this would allow tools to return control flow information in langgraph.

Simple example:

from langchain_core.tools import tool
from langchain_core.messages import ToolMessage

@tool
def multiply(a: int, b: int):
    """Multiplies two numbers"""
    result = a * b
    return ToolMessage(content=str(result))

multiply.invoke({"args": {"a": 13, "b": 2}, "type": "tool_call", "id": "1"})

@tool
def transfer_to_agent_a():
    """Routes to agent A."""
    return ToolMessage(content="Transferred to agent A!", command=GraphCommand(goto="agent_a")))

transfer_to_agent_a.invoke({"args": {}, "type": "tool_call", "id": "1"})

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
langchain	⬜️ Ignored (Inspect)			Nov 12, 2024 8:10pm