> 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.langchain.middleware

> LangChain AgentMiddleware implementation for NeMo Relay.

Generated from `python/nemo_relay/integrations/langchain/middleware.py`.

Module `nemo_relay.integrations.langchain.middleware`.

LangChain AgentMiddleware implementation for NeMo Relay.

## Classes

### `NemoRelayMiddleware(AgentMiddleware)`

Route LangChain agent model and tool calls through NeMo Relay.

#### Methods

##### `NemoRelayMiddleware`

```python
def NemoRelayMiddleware(*, name: str = 'NemoRelayMiddleware') -> None
```

Create an instance.

##### `name`

```python
def name() -> str
```

Middleware name used by LangChain graph nodes and traces.

##### `wrap_model_call`

```python
def wrap_model_call(request: ModelRequest[Any], handler: Callable[[ModelRequest[Any]], ModelResponse[Any]]) -> ModelResponse[Any]
```

Wrap a sync LangChain agent model call in NeMo Relay LLM execution.

##### `awrap_model_call`

```python
async def awrap_model_call(request: ModelRequest[Any], handler: Callable[[ModelRequest[Any]], Awaitable[ModelResponse[Any]]]) -> ModelResponse[Any]
```

Wrap an async LangChain agent model call in NeMo Relay LLM execution.

##### `wrap_tool_call`

```python
def wrap_tool_call(request: ToolCallRequest, handler: Callable[[ToolCallRequest], ToolMessage | Command[Any]]) -> ToolMessage | Command[Any]
```

Wrap a sync LangChain agent tool call in NeMo Relay tool execution.

##### `awrap_tool_call`

```python
async def awrap_tool_call(request: ToolCallRequest, handler: Callable[[ToolCallRequest], Awaitable[ToolMessage | Command[Any]]]) -> ToolMessage | Command[Any]
```

Wrap an async LangChain agent tool call in NeMo Relay tool execution.