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 martinholovsky/claude-skills-generator --skill websocketgit clone --depth 1 https://github.com/martinholovsky/claude-skills-generatorWrote 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/martinholovsky/claude-skills-generator/websocket)<a href="https://agentmods.dev/skills/martinholovsky/claude-skills-generator/websocket"><img src="https://agentmods.dev/badge/skills/martinholovsky/claude-skills-generator/websocket/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.
<a href="https://agentmods.dev/skills/martinholovsky/claude-skills-generator/websocket"><img src="https://agentmods.dev/badge/skills/martinholovsky/claude-skills-generator/websocket.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00022 | $0.03419 |
| Opus 5 | $0.00011 | $0.01709 |
| Sonnet 5 | $0.00004 | $0.00684 |
| Haiku 4.5 | $0.00002 | $0.00342 |
Grade A, and why
websocket 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 9d 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 — 499 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WebSocket Security Skill
File Organization
- SKILL.md: Core principles, patterns, essential security (this file)
- references/security-examples.md: CSWSH examples and authentication patterns
- references/advanced-patterns.md: Connection management, scaling patterns
- references/threat-model.md: Attack scenarios including CSWSH
Validation Gates
Gate 0.2: PASSED (5+ vulnerabilities documented) - CVE-2024-23898, CVE-2024-26135, CVE-2023-0957
1. Overview
Risk Level: HIGH
Justification: WebSocket connections bypass Same-Origin Policy protections, making them vulnerable to Cross-Site WebSocket Hijacking (CSWSH). Persistent connections require careful authentication, session management, and input validation.
You are an expert in WebSocket security, understanding the unique vulnerabilities of persistent bidirectional connections.
Core Expertise Areas
- CSWSH (Cross-Site WebSocket Hijacking) prevention
- Origin header validation and token-based authentication
- Message validation and per-message authorization
- Rate limiting and connection lifecycle security
2. Core Responsibilities
Fundamental Principles
- TDD First: Write tests before implementation - test security boundaries, connection lifecycle
- Performance Aware: Optimize for low latency (<50ms), connection pooling, backpressure
- Validate Origin: Always check Origin header against explicit allowlist
- Authenticate First: Verify identity before accepting messages
- Authorize Each Action: Don't assume connection equals unlimited access
- Validate All Messages: Treat WebSocket messages as untrusted input
- Limit Resources: Rate limit messages, timeout idle connections
Security Decision Framework
| Situation | Approach |
|---|---|
| New connection | Validate Origin, require authentication token |
| Each message | Validate format, check authorization for action |
| Sensitive operations | Re-verify session, log action |
| Idle connection | Timeout after inactivity period |
| Error condition | Close connection, log details |
What ships with it
3 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.
- 9d ago First seen · 499 lines · 22 tokens per session scan A 2eaf0dc2f61f
websocket is a skill published in the GitHub repository martinholovsky/claude-skills-generator (45 stars, last pushed 9mo ago), licensed Unlicense. It adds 22 tokens to every session and 3,419 once invoked, about $0.0001 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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