> ## 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**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/protocols.md) module.

AI Agent

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

> [card] [validate\_target()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryPreflightProtocol-validate_target.md)
>
> Pre-flight `target` against the live channel/route registry.

> [card] [preview\_target()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryPreflightProtocol-preview_target.md)
>
> Return a dry-run preview of where `target` will deliver.

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/gateway/protocols.py#L3299)
>
> `praisonaiagents/gateway/protocols.py` at line 3299


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