nemo_relay.integrations.langgraph.callbacks

LangGraph callback handler that reuses the LangChain NeMo Relay integration.

Classes

NemoRelayCallbackHandler

Bridge LangChain and LangGraph runs to NeMo Relay using public callback APIs.

Module Contents

class nemo_relay.integrations.langgraph.callbacks.NemoRelayCallbackHandler

Bases: nemo_relay.integrations.langchain.callbacks.NemoRelayCallbackHandler, langgraph.callbacks.GraphCallbackHandler

Bridge LangChain and LangGraph runs to NeMo Relay using public callback APIs.

This handler inherits the existing LangChain callback integration, so normal runnable scopes from LangGraph and LangChain are recorded by the same code path. It also implements LangGraph’s public lifecycle callback hooks for interrupt and resume marks.

on_interrupt(event: langgraph.callbacks.GraphInterruptEvent) → Any

Emit a NeMo Relay mark for a LangGraph interrupt lifecycle event.

on_resume(event: langgraph.callbacks.GraphResumeEvent) → Any

Emit a NeMo Relay mark for a LangGraph resume lifecycle event.