---
auto_generated: true
title: Concepts
path: concepts
status: published
---

# Concepts

Core ideas worth modelling before you write code. Each topic is self-contained — skim the one you need.

- **[Architecture](/docs/scaigrid/scaiqueue/concepts/architecture)** — How publish, claim, complete, and reclaim fit together — MariaDB rows, Redis sorted sets, system agents.
- **[Topics, types, and HITL specs](/docs/scaigrid/scaiqueue/concepts/topics-and-types)** — What makes a queue a typed channel — message_type, schemas, labels, priority tiers, HITL rendering specs.