add-websockets-railway

add-websockets-railway is a command for Claude Code from LarouexNonprofitConsulting/larouex-fullstack-plugin. It costs 0 tokens per session (127 once invoked), scanned A, original, MIT.

A command for adding real-time two-way communication to an Express application using WebSockets and Socket.io. It includes React client connections, grouped rooms, authentication, reconnection, health checks, and messaging examples.

In plain words
What is it for?
Use it to build chat, live updates, notifications, room-based messaging, or private messages in a React and Express app deployed on Railway.
Why use it?
It handles the connection details needed when a browser and server must exchange updates without repeated page requests. It also covers common concerns such as authentication, dropped connections, and multiple server instances.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the larouex-fullstack-builder plugin — 80 commands shipped together

Good fit Use it to build chat, live updates, notifications, room-based messaging, or private messages in a React and Express app deployed on Railway.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/LarouexNonprofitConsulting/larouex-fullstack-plugin

Made for: Claude Code.

Or install larouex-fullstack-builder, the plugin that ships this one along with the rest of its 80 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for add-websockets-railway

README.md
[![agentmods](https://agentmods.dev/badge/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway/github.svg)](https://agentmods.dev/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway)
Your own site
<a href="https://agentmods.dev/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway"><img src="https://agentmods.dev/badge/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for add-websockets-railway

Your own site · 80×15
<a href="https://agentmods.dev/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway"><img src="https://agentmods.dev/badge/commands/larouexnonprofitconsulting/larouex-fullstack-plugin/add-websockets-railway.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 127 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.00127
Opus 5 $0.00000 $0.00063
Sonnet 5 $0.00000 $0.00025
Haiku 4.5 $0.00000 $0.00013

Measured 6d ago against content hash 7ed264a5dbd6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

add-websockets-railway scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

commands/add-websockets-railway.md · 2 lines

What it actually says

Implement WebSockets using Socket.io on Railway. Set up Socket.io server integrated with Express application. Configure CORS for WebSocket connections. Create client connection hooks with React. Implement room-based messaging for grouped communication. Add user authentication for WebSocket connections using JWT. Handle connection and disconnection events. Implement reconnection logic with exponential backoff. Add heartbeat/ping-pong for connection health monitoring. Create message broadcasting and private messaging. Provide examples: real-time chat, live updates, notifications. Handle scaling with Redis adapter for multiple server instances. Reference devops-railway-agent for Railway deployment. Test WebSocket functionality in production environment.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 2 lines · 0 tokens per session scan A 7ed264a5dbd6

Subscribe to this mod's changes

add-websockets-railway is a command published in the GitHub repository LarouexNonprofitConsulting/larouex-fullstack-plugin (8 stars, last pushed 11mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 127 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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