> ## 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 • AI Agent SDK

> register: Register middleware for a specific runtime.

# register

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.

Register middleware for a specific runtime.

## Signature

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

## Parameters

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

Unique identifier for the runtime (e.g., "claude\_harness")

**middleware** `RuntimeToolResultMiddleware` *required*

Middleware instance implementing RuntimeToolResultMiddleware

## Uses

* `logger.warning`
* `logger.debug`

## Used By

* [`HookRegistry.register_function`](../functions/HookRegistry-register_function)
* [`HookRegistry.register_command`](../functions/HookRegistry-register_command)
* [`register_middleware`](../functions/register_middleware)
* [`register_runtime`](../functions/register_runtime)
* [`tool`](../functions/tool)

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/runtime/middleware_registry.py#L44)
>
> `praisonaiagents/runtime/middleware_registry.py` at line 44


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