> ## 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.

# Register Middleware • AI Agent SDK

> register_middleware: Register middleware in the global registry.

# register\_middleware

Function

> This function is defined in the [**middleware\_registry**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/middleware_registry.md) module.

Register middleware in the global registry.

Convenience function for plugin harnesses to register their middleware.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def register_middleware(runtime_id: str, middleware: RuntimeToolResultMiddleware) -> None
```

## Parameters

**runtime\_id** `str` *required*

Unique identifier for the runtime

**middleware** `RuntimeToolResultMiddleware` *required*

Middleware instance

## Uses

* `get_default_middleware_registry`
* `registry.register`

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/runtime/middleware_registry.py#L147)
>
> `praisonaiagents/runtime/middleware_registry.py` at line 147

***

## Related Documentation

> [card] [Middleware Feature](https://praison.ai/docs/docs/features/middleware)


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