# Architecture

* [Operating model](model.md) - the trust posture and who may reach what
* [Components](components.md) - the process model and subsystem boundaries
* [Data model](data-model.md) - the hub store and the session brain file
* [Agent surface](agent-surface.md) - the MCP tools
* [Human surface](human-surface.md) - the REST API and the PWA

Every page in this section describes intended design. The store, the brain
wrapper, and the feed surface exist; the pages name what ships.