socket-io

socket-io is a skill for Claude Code, Codex from mercuryPark/oc-setup. It costs 33 tokens per session (306 once invoked), scanned A, original, MIT.

A guide for building real-time web communication with Socket.IO, a library that sends events between browsers and servers without waiting for regular page requests. It covers connections, event handling, errors, reconnection, and multi-server setups.

In plain words
What is it for?
Use it to build chat, notifications, live updates, and other event-driven features with reconnection, acknowledgments, namespaces, and scaling considerations.
Why use it?
Real-time features must cope with dropped connections, failed events, and servers running across multiple machines. The guide provides patterns for handling those situations predictably.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/mercurypark/oc-setup/socket-io
Any agent
npx skills add mercuryPark/oc-setup --skill socket-io
Clone the repo
git clone --depth 1 https://github.com/mercuryPark/oc-setup

Made for: Claude Code, Codex.

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 socket-io

README.md
[![agentmods](https://agentmods.dev/badge/skills/mercurypark/oc-setup/socket-io.svg)](https://agentmods.dev/skills/mercurypark/oc-setup/socket-io)
Your own site
<a href="https://agentmods.dev/skills/mercurypark/oc-setup/socket-io"><img src="https://agentmods.dev/badge/skills/mercurypark/oc-setup/socket-io.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 306 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00033 $0.00306
Opus 5 $0.00016 $0.00153
Sonnet 5 $0.00007 $0.00061
Haiku 4.5 $0.00003 $0.00031

Measured 3d ago against content hash 11a7562bee8a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

socket-io 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 3d 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.

templates/skills/socket-io/SKILL.md · 61 lines

What it actually says

Socket.io Development Guide

Connection Management

Client Connection

  • Always implement reconnection strategy
  • Handle connection errors gracefully
  • Use namespaces for feature separation

Server Setup

const io = new Server(server, {
  cors: { origin: process.env.CLIENT_URL },
  pingTimeout: 60000,
  pingInterval: 25000
})

Event Patterns

Naming Convention

  • Use snake_case for event names
  • Prefix: user_, system_, room_
  • Example: user_message_sent, system_notification

Acknowledgment Pattern

// Client
socket.emit('send_message', data, (ack) => {
  if (ack.error) handleError(ack.error)
})

// Server
socket.on('send_message', async (data, callback) => {
  try {
    await saveMessage(data)
    callback({ success: true })
  } catch (err) {
    callback({ error: err.message })
  }
})

Error Handling

  • Implement connection state recovery
  • Handle middleware errors
  • Log socket errors for debugging
  • Graceful degradation on connection loss

Scaling

  • Use Redis Adapter for multi-server setups
  • Implement sticky sessions
  • Consider horizontal scaling early
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. 3d ago First seen · 61 lines · 33 tokens per session scan A 11a7562bee8a

Subscribe to this mod's changes

socket-io is a skill published in the GitHub repository mercuryPark/oc-setup (2 stars, last pushed 4mo ago), licensed MIT. It adds 33 tokens to every session and 306 once invoked, about $0.0002 per session on Opus 5. 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 2026-08-31.

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