> ## Documentation Index
> Fetch the complete documentation index at: https://uip-f4b0bbe5.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# LangChain

> Use AGCMS with langchain-openai.

```python theme={null}
from langchain_openai import ChatOpenAI
from langchain_core.messages import HumanMessage

llm = ChatOpenAI(
    model="groq:llama-3.3-70b-versatile",
    base_url="https://api.your-tenant.agcms.com/v1",
    api_key="agc_live_...",
)

resp = llm.invoke([HumanMessage(content="What is a Merkle root?")])
print(resp.content)
```

Pair with LangChain callbacks to log the AGCMS interaction ID alongside each
chain run for end-to-end traceability.