> This page is for NeMo Relay, version v0.10.0.
> For other versions, use one of these documentation indexes:
> - Latest (v0.10.0) (default): https://docs.nvidia.com/nemo/relay/latest/llms.txt
> - dev: https://docs.nvidia.com/nemo/relay/dev/llms.txt
> - v0.10.0: https://docs.nvidia.com/nemo/relay/v0.10.0/llms.txt
> - v0.9.4: https://docs.nvidia.com/nemo/relay/v0.9.4/llms.txt
> - v0.8.4: https://docs.nvidia.com/nemo/relay/v0.8.4/llms.txt
> - v0.7.3: https://docs.nvidia.com/nemo/relay/v0.7.3/llms.txt
> - v0.6.0: https://docs.nvidia.com/nemo/relay/v0.6.0/llms.txt
> - v0.5.0: https://docs.nvidia.com/nemo/relay/v0.5.0/llms.txt

> 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 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.

## Functions

### `configure_graph`

```python
def configure_graph(graph: _GraphT) -> _GraphT
```

Install Relay lifecycle callbacks in a compiled graph's base config.