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

# Relay service

> WebSocket collaboration engine (operations + presence)

Relay provides real-time collaboration over WebSockets.

Treat Relay as the low-latency interaction surface: clients connect, establish session context, and
exchange collaboration operations and presence updates.

## Responsibilities

* WebSocket session management
* Concurrent editing coordination (operational transform)
* Presence (cursor/selection) streaming
* Event-driven synchronization with the rest of the system

## Interfaces

* WebSocket protocol: message shapes, handshake, and lifecycle
* Event consumption/production: integration with the broader event-driven system

## Related docs

* [/concepts](/concepts) for collaboration primitives
* [/developer/domain/relay/websocket-protocol](/developer/domain/relay/websocket-protocol) for protocol details

## Integration notes (baseline)

* Design clients to reconnect and resubscribe safely.
* Assume ordering guarantees are limited unless documented otherwise.