> ## 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

Method

> This is a method of the [**MiddlewareRegistry**](https://praison.ai/docs/sdk/reference/praisonaiagents/classes/MiddlewareRegistry.md) class in the [**middleware\_registry**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/middleware_registry.md) module.

List all registered runtime IDs.

## Signature

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

### Returns

**Returns** `list[str]`

List of runtime IDs with registered middleware

## Used By

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

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/runtime/middleware_registry.py#L104)
>
> `praisonaiagents/runtime/middleware_registry.py` at line 104


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