> ## Documentation Index
> Fetch the complete documentation index at: https://docs.app.useharmonia.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# SQS

> Repeatable delivery with application-owned idempotency.

## How Harmonia uses it

Stage and production outboxes publish JSON envelopes containing data and trace/scope attributes. Workers validate the envelope, acquire durable claims, and acknowledge only a durable outcome. Failed and malformed deliveries remain for retry and dead-letter redrive. Visibility renewals protect long-running work; revision and approval checks remain authoritative.

## Implementation

`agent/harmonia_agent/sqs_transport.py`

## Evidence status

This AWS edition has no authenticated deployment or provider rehearsal yet. Paid validation remains disabled. Local checks are reported separately from live proof.