> ## 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.

# Delivery Preflight Protocol • AI Agent SDK

> DeliveryPreflightProtocol: Optional creation-time pre-flight extension for delivery resolvers.

# DeliveryPreflightProtocol

> Defined in the [**protocols**](../modules/protocols) module.

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

Optional creation-time pre-flight extension for delivery resolvers.

Kept separate from :class:`DeliveryResolverProtocol` so the base contract
stays `resolve()`-only: an existing resolver that implements just
`resolve` still satisfies `DeliveryResolverProtocol` under
`isinstance`/`runtime_checkable`. A resolver that can additionally
pre-flight or preview a target against its live registry advertises that by
also satisfying this protocol; callers duck-type on it and fall back to a
structural, registry-free check (:meth:`DeliveryTarget.preview`) otherwise.

## Methods

<CardGroup cols={2}>
  <Card title="validate_target()" icon="function" href="../functions/DeliveryPreflightProtocol-validate_target">
    Pre-flight `target` against the live channel/route registry.
  </Card>

  <Card title="preview_target()" icon="function" href="../functions/DeliveryPreflightProtocol-preview_target">
    Return a dry-run preview of where `target` will deliver.
  </Card>
</CardGroup>

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/gateway/protocols.py#L2394">
  `praisonaiagents/gateway/protocols.py` at line 2394
</Card>