> ## 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

<div className="flex items-center gap-2">
  <Badge color="teal">Function</Badge>
</div>

> This function is defined in the [**middleware\_registry**](../modules/middleware_registry) 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

<ParamField query="runtime_id" type="str" required={true}>
  Unique identifier for the runtime
</ParamField>

<ParamField query="middleware" type="RuntimeToolResultMiddleware" required={true}>
  Middleware instance
</ParamField>

## Uses

* `get_default_middleware_registry`
* `registry.register`

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/runtime/middleware_registry.py#L147">
  `praisonaiagents/runtime/middleware_registry.py` at line 147
</Card>

***

## Related Documentation

<CardGroup cols={2}>
  <Card title="Middleware Feature" icon="layer-group" href="/docs/docs/features/middleware" />
</CardGroup>