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 agentmods add skills/codebygarv/ai-skills/websocket-protocol-designernpx skills add codebygarv/Ai-skills --skill websocket-protocol-designergit clone --depth 1 https://github.com/codebygarv/Ai-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/codebygarv/ai-skills/websocket-protocol-designer)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/websocket-protocol-designer"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/websocket-protocol-designer.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 | $0.00032 | $0.00390 |
| Opus 5 | $0.00016 | $0.00195 |
| Sonnet 5 | $0.00006 | $0.00078 |
| Haiku 4.5 | $0.00003 | $0.00039 |
Grade A, and why
websocket-protocol-designer 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 4d 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.
What it actually says
Purpose
Architect reliable, low-overhead real-time messaging protocols over WebSockets or Server-Sent Events (SSE), incorporating connection lifecycle handshakes, heartbeat ping/pong keep-alives, exponential reconnect backoff, channel multiplexing, and reconnection state recovery.
When to Use
- Building real-time collaborative editors, live chat, trading dashboards, or notification feeds.
- Fixing zombie WebSocket connections that silently drop behind NAT firewalls.
- Implementing message ordering and missed message replay after temporary disconnection.
What to Analyze
- Protocol Selection: WebSocket (bidirectional) vs SSE (unidirectional server-to-client with native HTTP/2 multiplexing).
- Frame Format: Lightweight JSON envelopes vs Binary MessagePack/Protobuf for high-frequency data.
- Heartbeat & Liveness: 30-second ping/pong frames to detect dead sockets through intermediate proxies.
- Reconnection & Catch-Up: Client reconnects with
last_event_id; server streams missed events from Redis buffer. - Authentication & Authorization: Ticket-based token exchange during connection handshake vs query param auth.
Output Format
- Message Envelope JSON Schema: Standard frame format (
type,channel,id,payload,ack). - Connection State Machine: Client connection lifecycles (
CONNECTING,CONNECTED,RECONNECTING,CLOSED). - Server/Client Implementation Snippets: TypeScript / Node / Go socket handler with ping/pong management.
Avoid
- Authenticating sockets by passing static JWT tokens in URL query strings (leaks into proxy access logs).
- Missing backpressure controls when broadcasting to slow mobile clients.
What ships with it
2 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.
- 4d ago First seen · 34 lines · 32 tokens per session scan A 6a2e8231569c
websocket-protocol-designer is a skill published in the GitHub repository codebygarv/Ai-skills (24 stars, last pushed 15d ago), licensed MIT. It adds 32 tokens to every session and 390 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 2026-08-30.
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