langchain

mirror of https://github.com/hwchase17/langchain.git synced 2026-01-30 05:47:54 +00:00

Files

ccurme 4b9e2e51f3 core[patch]: add token counting callback handler (#30481 )

Stripped-down version of
[OpenAICallbackHandler](https://github.com/langchain-ai/langchain/blob/master/libs/community/langchain_community/callbacks/openai_info.py)
that just tracks `AIMessage.usage_metadata`.

```python
from langchain_core.callbacks import get_usage_metadata_callback
from langgraph.prebuilt import create_react_agent

def get_weather(location: str) -> str:
    """Get the weather at a location."""
    return "It's sunny."

tools = [get_weather]
agent = create_react_agent("openai:gpt-4o-mini", tools)

with get_usage_metadata_callback() as cb:
    result = await agent.ainvoke({"messages": "What's the weather in Boston?"})
    print(cb.usage_metadata)
```

2025-03-25 18:16:39 -04:00

cli

cli: use pytest-watcher (#30465 )

2025-03-24 18:06:31 +00:00

community

community: deprecate graph vector store (#30328 )

2025-03-25 13:52:54 +00:00

core

core[patch]: add token counting callback handler (#30481 )

2025-03-25 18:16:39 -04:00

experimental

…