> ## 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.

# Callback Backend • AI Agent SDK

> CallbackBackend: Wraps a legacy ``(function_name, arguments, risk_level) - ApprovalDecision`` callback

# CallbackBackend

> Defined in the [**backends**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/backends.md) module.

AI Agent

Wraps a legacy `(function_name, arguments, risk_level) -> ApprovalDecision` callback
into an :class:`ApprovalProtocol`-compatible backend.

Used internally by :func:`set_approval_callback` for backward compatibility.

## Constructor

**callback** `Any` *required*

No description available.

## Methods

> [card] [request\_approval\_sync()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/CallbackBackend-request_approval_sync.md)
>
> Instance method.

> [card] [request\_approval()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/CallbackBackend-request_approval.md)
>
> Instance method.

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/approval/backends.py#L484)
>
> `praisonaiagents/approval/backends.py` at line 484


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