> ## 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 Guarantee Protocol • AI Agent SDK

> DeliveryGuaranteeProtocol: Protocol for at-least-once message delivery.

# DeliveryGuaranteeProtocol

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

AI Agent

Protocol for at-least-once message delivery.

Messages are stored, tracked, and retried until acknowledged.

## Methods

> [card] [store\_message()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-store_message.md)
>
> Persist a message to the store.

> [card] [acknowledge()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-acknowledge.md)
>
> Mark a message as acknowledged by a client.

> [card] [nack()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-nack.md)
>
> Negative acknowledge - request redelivery.

> [card] [get\_unacknowledged()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-get_unacknowledged.md)
>
> Get pending unacknowledged messages for a client.

> [card] [retry\_unacknowledged()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-retry_unacknowledged.md)
>
> Redeliver all unacknowledged messages to a client.

> [card] [purge\_acknowledged()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/DeliveryGuaranteeProtocol-purge_acknowledged.md)
>
> Remove old acknowledged messages from the store.

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/gateway/protocols.py#L1958)
>
> `praisonaiagents/gateway/protocols.py` at line 1958


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