> ## 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**](../modules/backends) module.

<Badge color="blue">AI Agent</Badge>

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

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

## Constructor

<ParamField query="callback" type="Any" required={true}>
  No description available.
</ParamField>

## Methods

<CardGroup cols={2}>
  <Card title="request_approval_sync()" icon="function" href="../functions/CallbackBackend-request_approval_sync">
    Instance method.
  </Card>

  <Card title="request_approval()" icon="function" href="../functions/CallbackBackend-request_approval">
    Instance method.
  </Card>
</CardGroup>

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/approval/backends.py#L289">
  `praisonaiagents/approval/backends.py` at line 289
</Card>