> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# List Runtimes • AI Agent SDK

> list_runtimes: List all registered runtime IDs.

# list\_runtimes

<div className="flex items-center gap-2">
  <Badge color="purple">Method</Badge>
</div>

> This is a method of the [**MiddlewareRegistry**](../classes/MiddlewareRegistry) class in the [**middleware\_registry**](../modules/middleware_registry) module.

List all registered runtime IDs.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def list_runtimes() -> list[str]
```

### Returns

<ResponseField name="Returns" type="list[str]">
  List of runtime IDs with registered middleware
</ResponseField>

## Used By

* [`RuntimeRegistry.list_names`](../functions/RuntimeRegistry-list_names)
* [`list_runtimes`](../functions/list_runtimes)

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/runtime/middleware_registry.py#L104">
  `praisonaiagents/runtime/middleware_registry.py` at line 104
</Card>