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websocket-patterns

WebSocket patterns for web apps: robust clients, reconnection, resync, multiplexing, and scaling realtime features. Use when adding live features to web frontends.

skills/websocket-patterns/SKILL.md

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# WebSocket Patterns

A frontend-focused companion to WebSocket fundamentals: the client-side patterns for reliable realtime web features — connection management, reconnection with resync, multiplexing topics, and scaling considerations from the web app's perspective.

## Overview

From the web app's side, WebSockets are deceptively simple (`new WebSocket(url)`) and deceptively fragile (networks drop, servers restart, messages get missed). This skill covers the **client patterns** that make realtime features feel solid: a robust socket wrapper, reconnection with backoff and resync, topic multiplexing over one connection, and graceful degradation — plus what to ask of the backend.

## When to use

- Adding live updates, chat, notifications, or presence to a web app.
- Building a reusable realtime client layer.
- Debugging missed messages after reconnects.
- Deciding message protocol and topic structure with the backend team.
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