# StreamConverter

> **Class** in `langchain_azure_ai`

📖 [View in docs](https://reference.langchain.com/python/langchain-azure-ai/agents/hosting/_converters/_stream/StreamConverter)

Convert one LangGraph invocation stream into Responses events.

One converter is created per Responses call. It caches transient conversion
state, such as a partially built message or IDs used for deduplication.

## Signature

```python
StreamConverter(
    self,
    stream: ResponseEventStream,
    *,
    usage: UsageAccumulator | None = None,
)
```

## Constructors

```python
__init__(
    self,
    stream: ResponseEventStream,
    *,
    usage: UsageAccumulator | None = None,
) -> None
```

| Name | Type |
|------|------|
| `stream` | `ResponseEventStream` |
| `usage` | `UsageAccumulator \| None` |


## Methods

- [`checkpoint()`](https://reference.langchain.com/python/langchain-azure-ai/agents/hosting/_converters/_stream/StreamConverter/checkpoint)
- [`handle_message_chunk()`](https://reference.langchain.com/python/langchain-azure-ai/agents/hosting/_converters/_stream/StreamConverter/handle_message_chunk)
- [`handle_update()`](https://reference.langchain.com/python/langchain-azure-ai/agents/hosting/_converters/_stream/StreamConverter/handle_update)
- [`flush()`](https://reference.langchain.com/python/langchain-azure-ai/agents/hosting/_converters/_stream/StreamConverter/flush)

---

[View source on GitHub](https://github.com/langchain-ai/langchain-azure/blob/7a6a664d617264df8dcb12fcfb1bacc09f21d504/libs/azure-ai/langchain_azure_ai/agents/hosting/_converters/_stream.py#L286)