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ai-coding-class: Skill for Claude Code

.claude/skills/verify-references/SKILL.md

verify-references is a skill for Claude Code from john-guerra/ai-coding-class. It costs 30 tokens per session (628 once invoked), scanned A, original, no licence file.

A checking workflow for course materials that contain research, citations, or factual claims. It verifies that referenced web addresses work and that numerical claims have sources.

In plain words
What is it for?
Use it to review URLs, citations, and numeric statements in lessons, handouts, or other educational content.
Why use it?
It helps catch broken links and unsupported numbers before the materials are published or shared.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is john-guerra/ai-coding-class's own configuration. It tells Claude Code how to work on ai-coding-class itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ai-coding-class configures →

not rated 1repo 2d ago A scan 30 tokens custom licence
View source ↗ john-guerra/ai-coding-class
Reuse

Borrowing it

Nothing to install: this file belongs to john-guerra/ai-coding-class. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/john-guerra/ai-coding-class/main/.claude/skills/verify-references/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/john-guerra/ai-coding-class

Made for: Claude Code.

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 verify-references

README.md
[![agentmods](https://agentmods.dev/badge/skills/john-guerra/ai-coding-class/verify-references/github.svg)](https://agentmods.dev/skills/john-guerra/ai-coding-class/verify-references)
Your own site
<a href="https://agentmods.dev/skills/john-guerra/ai-coding-class/verify-references"><img src="https://agentmods.dev/badge/skills/john-guerra/ai-coding-class/verify-references/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 verify-references

Your own site · 80×15
<a href="https://agentmods.dev/skills/john-guerra/ai-coding-class/verify-references"><img src="https://agentmods.dev/badge/skills/john-guerra/ai-coding-class/verify-references.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 628 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 unknown 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 $0.00030 $0.00628
Opus 5.5 $0.00012 $0.00251
Sonnet 5.5 $0.00006 $0.00126
Haiku 4.5 $0.00003 $0.00063

Measured 2mo ago against content hash eea77f2d9979, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

verify-references 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 2mo 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.

.claude/skills/verify-references/SKILL.md · 80 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 2mo ago First seen · 80 lines · 30 tokens per session scan A eea77f2d9979

Subscribe to this mod's changes

verify-references is a skill published in the GitHub repository john-guerra/ai-coding-class (1 stars, last pushed 2d ago), with no licence file. It adds 30 tokens to every session and 628 once invoked, about $0.0001 per session on Opus 5.5. 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.

Learning and teachingResearch
Related

verify-references compared with skills from other repositories

verify-references next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
verify-referencesjohn-guerra/ai-coding-classSkill12d agononeA30Claude Code
hr-onboardingnexu-io/open-designSkill106kyesterdayApache-2.0A62Claude Code, Codex
book-mirrorgarrytan/gbrainSkill32kyesterdayMITA138Claude Code
exam-forecastanthropics/claude-for-legalSkill9.9k3d agoApache-2.0A73Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleepSkill19k3d agoMITA81Claude Code
eli5companion-inc/feynmanSkill10k6d agoMITA63Claude Code, Codex
deck-course-modulenexu-io/html-anythingSkill9.4k25d agoApache-2.0A25Claude Code, Codex