> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/relay/llms.txt.
> For full documentation content, see https://docs.nvidia.com/nemo/relay/llms-full.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/relay/_mcp/server.

# nemo_relay.integrations.langgraph.callbacks

> LangGraph callback handler that reuses the LangChain NeMo Relay integration.

Generated from `python/nemo_relay/integrations/langgraph/callbacks.py`.

Module `nemo_relay.integrations.langgraph.callbacks`.

LangGraph callback handler that reuses the LangChain NeMo Relay integration.

## Classes

### `NemoRelayCallbackHandler(LangChainNemoRelayCallbackHandler, GraphCallbackHandler)`

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

#### Methods

##### `on_interrupt`

```python
def on_interrupt(event: GraphInterruptEvent) -> Any
```

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

##### `on_resume`

```python
def on_resume(event: GraphResumeEvent) -> Any
```

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