What is ljg-skills CLAUDE.md?

Repository guidance for a personal collection of Claude Code skills, including their folder layout, Markdown format, and inventory.

Use it when creating or updating skills, organizing references and scripts, or checking which skills and dependencies are available.

It gives Claude Code consistent rules for understanding, adding, and maintaining skills in the repository.

How lijigang/ljg-skills configures Claude Code

About the project

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.

lijigang/ljg-skills · 7,566 stars · on GitHub

Reuse

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.

Copy the file

curl -O https://raw.githubusercontent.com/lijigang/ljg-skills/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/lijigang/ljg-skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/lijigang/ljg-skills/claude-md/github.svg)](https://agentmods.dev/instructions/lijigang/ljg-skills/claude-md)

Your own site

<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.

Your own site · 80×15

<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>

Per session 959 This file is loaded in full into every session.

When invoked 959 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00959	$0.00959
Opus 5.5	$0.00384	$0.00384
Sonnet 5.5	$0.00192	$0.00192
Haiku 4.5	$0.00096	$0.00096

Measured 23d ago against content hash 744a8323ea02, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 23d 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.md · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 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-explain`	Clear explanations of concepts, formulas, and principles	None
`ljg-mechanism`	Evidence-grounded mechanism research	Web search and source retrieval
`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: true can be triggered via /skill-name or natural language
Trigger phrases are defined in each skill's description field
Skills can call other skills via the Skill tool

Read the full file on GitHub · 119 lines

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.

23d ago Changed · +5 lines · +68 tokens per session 744a8323ea02
1mo ago First seen · 114 lines · 891 tokens per session scan A 501d9ddab340

Subscribe to this mod's changes

ljg-skills CLAUDE.md is an instructions file published in the GitHub repository lijigang/ljg-skills (7,566 stars, last pushed yesterday), licensed MIT. It adds 959 tokens to every session, about $0.0038 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 2026-08-30.

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

ljg-skills: Instructions file for Claude Code