noma-langchain-integration

Noma guardrail middleware for LangChain agents. Scans user and assistant messages to detect and handle unsafe content before and after agent execution.

Installation

pip install noma-langchain-integration

Quick start

from langchain.agents import create_agent
from langchain_noma.middleware import NomaGuardrailMiddleware

middleware = NomaGuardrailMiddleware(
    api_key="noma-...",  # or set NOMA_API_KEY env var
)

agent = create_agent(
    model="openai:gpt-4.1",
    tools=[...],
    middleware=[middleware],
)

The middleware runs two hooks automatically:

• before_agent — scans user messages before the agent processes them.
• after_agent — scans assistant messages after the agent responds.

Both sync and async hooks are supported (abefore_agent, aafter_agent).

Configuration

All parameters are optional and keyword-only:

Environment variables