ljg-skills is a collection of custom Codex skills for tasks such as learning, writing, reading, relationship analysis, image creation, and investment analysis. Codex users install selected skills or the whole collection through a skills command-line interface. The catalogue entries are the collection's individual skills, plugin, and instruction.
Borrowing it
Nothing to install: this file belongs to lijigang/ljg-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/lijigang/ljg-skills/master/CLAUDE.mdgit clone --depth 1 https://github.com/lijigang/ljg-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/instructions/lijigang/ljg-skills/claude-md)<a href="https://agentmods.dev/instructions/lijigang/ljg-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/lijigang/ljg-skills/claude-md/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/instructions/lijigang/ljg-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/lijigang/ljg-skills/claude-md.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 | $0.00891 | $0.00891 |
| Opus 5 | $0.00445 | $0.00445 |
| Sonnet 5 | $0.00178 | $0.00178 |
| Haiku 4.5 | $0.00089 | $0.00089 |
Grade A, and why
ljg-skills CLAUDE.md 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 11d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Overview
This is a personal Claude Code skills repository. Each skill is a self-contained directory that can be installed to ~/.claude/skills/ to extend Claude Code's capabilities.
Repository Structure
ljg-skills/
├── ljg-*/ # Each skill is a directory with "ljg-" prefix
│ ├── SKILL.md # Skill definition with YAML frontmatter
│ ├── references/ # Reference docs for complex skills
│ ├── assets/ # Templates, images, scripts
│ └── scripts/ # Helper scripts (bash, node)
├── README.md
└── .gitignore # Ignores everything except ljg-*/ and specific files
Skill Format
Each SKILL.md follows this structure:
---
name: skill-name
description: "What this skill does. Use when user says..."
user_invocable: true|false
version: "x.x.x"
---
# Skill content in markdown...
Skill Inventory
| Skill | Purpose | External Dependencies |
|---|---|---|
ljg-card |
Content → PNG visuals (long cards, infographs, posters) | Node.js + Playwright |
ljg-paper |
Academic paper analysis pipeline | None |
ljg-plain |
Plain language rewriter | None |
ljg-word |
English word deep-dive | None |
ljg-writes |
Writing engine for thinking through ideas | None |
Commands
Install ljg-card Dependencies
ljg-card requires Playwright for screenshot capture:
cd ljg-card && npm install && npx playwright install chromium
Install Skills (for users)
# Copy all skills to Claude Code
mkdir -p ~/.claude/skills
cp -r ljg-* ~/.claude/skills/
Architecture Notes
Skill Invocation
- Skills with
user_invocable: truecan be triggered via/skill-nameor natural language - Trigger phrases are defined in each skill's
descriptionfield - Skills can call other skills via the Skill tool
Content Processing Pipeline
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.
- 11d ago First seen · 114 lines · 891 tokens per session scan A 501d9ddab340
ljg-skills CLAUDE.md is an instructions file published in the GitHub repository lijigang/ljg-skills (7,327 stars, last pushed 2d ago), licensed MIT. It adds 891 tokens to every session, about $0.0045 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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