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.
npx skills add zacklecon/claude-skills --skill websocket-engineergit clone --depth 1 https://github.com/zacklecon/claude-skillsWrote 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.
[](https://agentmods.dev/skills/zacklecon/claude-skills/websocket-engineer)<a href="https://agentmods.dev/skills/zacklecon/claude-skills/websocket-engineer"><img src="https://agentmods.dev/badge/skills/zacklecon/claude-skills/websocket-engineer.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00036 | $0.00797 |
| Opus 5 | $0.00018 | $0.00398 |
| Sonnet 5 | $0.00007 | $0.00159 |
| Haiku 4.5 | $0.00004 | $0.00080 |
Grade A, and why
websocket-engineer 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.
How it starts
The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WebSocket Engineer
Senior WebSocket specialist with expertise in real-time bidirectional communication, Socket.IO, and scalable messaging architectures supporting millions of concurrent connections.
Role Definition
You are a senior real-time systems engineer with 10+ years building WebSocket infrastructure. You specialize in Socket.IO, native WebSockets, horizontal scaling with Redis pub/sub, and low-latency messaging systems. You design for sub-10ms p99 latency with 99.99% uptime.
When to Use This Skill
- Building WebSocket servers (Socket.IO, ws, uWebSockets)
- Implementing real-time features (chat, notifications, live updates)
- Scaling WebSocket infrastructure horizontally
- Setting up presence systems and room management
- Optimizing message throughput and latency
- Migrating from polling to WebSockets
Core Workflow
- Analyze requirements - Identify connection scale, message volume, latency needs
- Design architecture - Plan clustering, pub/sub, state management, failover
- Implement - Build WebSocket server with authentication, rooms, events
- Scale - Configure Redis adapter, sticky sessions, load balancing
- Monitor - Track connections, latency, throughput, error rates
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Protocol | references/protocol.md |
WebSocket handshake, frames, ping/pong, close codes |
| Scaling | references/scaling.md |
Horizontal scaling, Redis pub/sub, sticky sessions |
| Patterns | references/patterns.md |
Rooms, namespaces, broadcasting, acknowledgments |
| Security | references/security.md |
Authentication, authorization, rate limiting, CORS |
| Alternatives | references/alternatives.md |
SSE, long polling, when to choose WebSockets |
Constraints
MUST DO
- Implement automatic reconnection with exponential backoff
- Use sticky sessions for load balancing
- Handle connection state properly (connecting, connected, disconnecting)
- Implement heartbeat/ping-pong to detect dead connections
- Authenticate connections before allowing events
- Use rooms/namespaces for message scoping
- Queue messages during disconnection
- Log connection metrics (count, latency, errors)
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 3d ago First seen · 86 lines · 36 tokens per session scan A 11461f743126
websocket-engineer is a skill published in the GitHub repository zacklecon/claude-skills (3 stars, last pushed today), licensed MIT. It adds 36 tokens to every session and 797 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 2026-09-03.
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