Ljg Xray Article
lijigang/ljg-skill-xray-article
X-ray scans articles (blog posts, essays, opinion pieces) to extract the real question and cognitive collisions.
把一个名词或概念写成可使用的理解：先用普通话讲清它是什么、与相邻概念差在哪里，再说明它怎样运作、会改写什么判断，最后给出面对它时的行动抓手。USE WHEN 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用…
MITAuto-check passed
Install Ljg Is
$ npx skills add lijigang/ljg-skills --skill ljg-is -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install lijigang/ljg-skills ljg-is --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ljg-is .claude/skills/ljg-is && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .claude/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-isType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add lijigang/ljg-skills --skill ljg-is -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install lijigang/ljg-skills ljg-is --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ljg-is .agents/skills/ljg-is && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .agents/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add lijigang/ljg-skills --skill ljg-is -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install lijigang/ljg-skills ljg-is --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ljg-is .cursor/skills/ljg-is && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .cursor/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/lijigang/ljg-skills.git --path skills/ljg-is--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add lijigang/ljg-skills --skill ljg-is -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install lijigang/ljg-skills ljg-is --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ljg-is .gemini/skills/ljg-is && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .gemini/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install lijigang/ljg-skills ljg-isInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add lijigang/ljg-skills --skill ljg-is -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ljg-is .github/skills/ljg-is && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .github/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add lijigang/ljg-skills --skill ljg-is -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install lijigang/ljg-skills ljg-is --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lijigang/ljg-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ljg-is .opencode/skills/ljg-is && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "ljg-is" agent skill from https://github.com/lijigang/ljg-skills/tree/master/skills/ljg-is into .opencode/skills/ljg-is/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ljg-is", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
ljg-is- GitHub stars
- 7.5k
- Token cost
- ~671 tokens
- SKILL.md length
- 68 words
- Files
- 7
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- MIT
At a glance
把一个名词或概念写成可使用的理解：先用普通话讲清它是什么、与相邻概念差在哪里，再说明它怎样运作、会改写什么判断，最后给出面对它时的行动抓手。USE WHEN 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用…
- 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用 ljg-structure）
- SKILL.md covers Workflow Routing, 成品标准, 判断边界 and Gotchas, plus 1 more section
- Runs TypeScript scripts from its folder
What it does
Ljg Is is an agent skill from lijigang/ljg-skills. 把一个名词或概念写成可使用的理解：先用普通话讲清它是什么、与相邻概念差在哪里，再说明它怎样运作、会改写什么判断，最后给出面对它时的行动抓手。USE WHEN 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用 ljg-structure）。
Its SKILL.md is about 670 tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files (for example `Tools/ValidateNote.help.md`, `Tools/ValidateNote.test.ts` and `Tools/ValidateNote.ts`).
The licence is MIT.
When your agent uses it
- 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用 ljg-structure）
Example prompts
- “/ljg-is”
Requirements
- Node.js
What it can do on your machine
Read from SKILL.md and the folder at commit 9e75497. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (TypeScript), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Ljg Is loads about 671 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 68 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from lijigang/ljg-skills at commit 9e75497, republished under its MIT licence (© lijigang). 68 words, ~671 tokens.
Download SKILL.mdSave it as
.claude/skills/ljg-is/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- ljg-is
- description
- 把一个名词或概念写成可使用的理解：先用普通话讲清它是什么、与相邻概念差在哪里，再说明它怎样运作、会改写什么判断，最后给出面对它时的行动抓手。USE WHEN 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用 ljg-structure）。
- version
- 5.0.0
- user_invocable
- true
把一个名词讲到能用
只给定义，读者可能记住了词，却仍不知道怎样认出它。只讲动词，读者又可能知道它做了什么，却不清楚它究竟是哪一类东西、边界在哪里。
ljg-is 把两者接起来：名词回答「它是什么」，让概念在认知地图里站稳；动词回答「它怎样起作用」，让概念在现实里动起来。真正完成的理解还要继续走一步：它改写了读者原来的什么判断，下次遇到它时又能怎样行动。
它是什么，和什么不一样？
它靠什么动作产生结果？
知道这一点后，我不再怎样想？
下次遇到它，我先看什么、怎样做？这四个问题是一条理解路径，不是四个正文栏目。文章要像一个人顺着疑惑把事情讲明白，而不是把答案依次填进表格。
赵汀阳的「动词」思想在这里仍然重要，但它是一副有条件的透镜。面对制度、平台、角色或规范，可以继续追问谁选择了这种做法，它怎样改变参与者；面对目标函数、递归这类技术概念，动词首先是对象自身的运算与作用。材料没有显示社会反制，就不把技术说明硬拽成制度批判。
Workflow Routing
| Workflow | Trigger | File |
|---|---|---|
| UnderstandInUse | 把「是什么」与「怎样运作」接成可辨认、可判断、可行动的 Org 解读 | Workflows/TraceCreation.md |
成品标准
一篇合格解读会让读者发生四个连续变化：
能用一句普通话说出 X 属于什么，以及它与最容易混淆的对象差在哪里。定义要给边界，不能只给比喻或用途。
能顺着一个真实例子说明 X 怎样起作用。技术概念讲清输入、关键动作和结果；制度概念讲清参与者、规则怎样进入行动以及实际后果。只写对象真正具有的机制。
能指出自己原来哪种看法需要修改。认知变化必须由前面的定义和机制推出，不另起炉灶追求「深刻」。
能在一个具体情境里使用这番理解。行动指导要说清先看什么、怎样判断、何时调整，并能解释为什么。
正文从一个普通读者真的会有的疑惑、误解或使用场景进入，不强制编造人物故事。概念要尽早出现，例子负责验证解释，不负责制造戏剧性。
最后可以落在一句判断、一个行动原则或一个真实未决问题上。哪一种自然，由前文决定；问号不是深度证明。
默认写入：
~/Context/{时间戳}--理解-{目标片段}__is.org新成品使用 ljg-is-v5 schema。正文使用两到四个随内容生出的标题和四到十个自然段，不把「是什么 / 怎样运作 / 认知改变 / 行动指导」直接用作四个栏目。
判断边界
定义与理解不同。 用户若只要形式化定义、公式证明或术语翻译，直接回答即可；只有当他想理解概念如何工作、意味着什么或怎样使用时，才进入本技能。
动词不等于社会创制。 技术对象可以通过计算、映射、比较、压缩或递归起作用，不必虚构一个创造者故事。制度对象才追问选择者、规则与反作用。
行动指导不是操作手册。 本技能给判断抓手，不替代某个软件、流程或行业的逐步教程。
理由不能伪造。 区分材料支持的事实和分析者的推断。不知道就缩小判断，不替人物补写动机，也不把一般机制冒充具体案例事实。
Gotchas
不要把新合同写成新清单。 「定义、机制、启发、建议」若各占一栏，文章仍然生硬。它们应当像一条推理：因为 X 是这样运作的，所以原来的判断不够准确，下一次才应当这样做。
不要只给用途当定义。 「目标函数用来优化」没有说明它是什么；要补上它怎样给候选方案建立可比较关系，读者才可能把它与约束、指标或奖励区分开。
不要强制具体场景。 一个真实疑惑往往比虚构工程师或司机更自然。只有当人物行动确实承载机制时才使用故事。
不要强造赵汀阳式转折。 未选可能、反制、本源和未来不是必填项。它们只有能解释对象，并且有现实根据时才进入正文。
不要在结尾突然升级尺度。 前文讲算法，结尾忽然质问社会正义，通常不是深刻，而是换了问题。认知改变与行动指导必须能够逐句追溯到已经讲清的机制。
不要给万能建议。 「保持关注」「综合考虑」「具体问题具体分析」删除概念名后仍然成立，说明它没有使用前文的理解。
不要让元数据替正文说话。
definition、operation、recognition与guidance是后台索引；正文可以用更自然的说法，但全文读回必须找到同一内容。
Examples
目标函数
不要写：目标函数是优化的灵魂，它最终会反过来支配设计者。
可以写：目标函数是一把供求解过程比较方案的尺子。它给每个候选方案一个
可比较的结果，让程序知道往哪边改进。因此看到「最优」时，先补问一句：
这是按照哪把尺子得到的最优？绩效考核
先讲清：它是组织定期判断工作表现并连接后续决定的一套正式做法。
再讲它怎样通过指标、叙述或评议进入奖金与机会。由此自然推出：考核不只
记录工作，也会改变人们接下来选择什么工作；设计考核时要检查它正在奖励的
行为，而不能只检查表格是否完整。边界案例
User: 请给出递归函数的形式化定义并证明这个定理。
→ 不调用 ljg-is；这是形式定义与证明任务。
User: 我知道递归是自己调用自己，但还是不懂它到底是什么，写程序时怎么判断该不该用？
→ 调用 ljg-is；这需要把定义、运作方式、认知修正与使用判断接起来。© lijigang, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files in skills/ljg-is of lijigang/ljg-skills.
- SKILL.md
- Template.org
- Tools/ValidateNote.help.md
- Tools/ValidateNote.test.ts
- Tools/ValidateNote.ts
- Workflows/TraceCreation.md
- evals/evals.json
Open the folder on GitHubat commit 9e75497
Compare with similar skills
Ljg Is next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Ljg Is this skilllijigang/ljg-skills | 7.5k | — | ~671 | Automated safety check: Pass | MIT | |
| Ljg Xray Articlelijigang/ljg-skill-xray-article | 130 | — | ~607 | Automated safety check: Pass | MIT | |
| Paper Explainer for Non-Specialistslijigang/ljg-skill-paper | 138 | — | ~712 | Automated safety check: Pass | MIT | |
| Light Idea CritiqueLight0305/Light-skills | 640 | — | ~4.7k | Automated safety check: Pass | MIT | |
| Os ChannelCronusL-1141/AI-company | 371 | — | ~969 | Automated safety check: Pass | MIT | |
| Reg Gap Analysiszhou210712/claude-for-legal-ZH | 225 | — | ~1k | Automated safety check: Pass | Apache-2.0 |
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X Content
scarletkc/agents
为 X（Twitter）寻找值得发的素材、筛选选题、撰写和改进帖文或串，并从读者视角重读，改善吸引力、阅读连贯性和真实讨论空间。用户问 X 最近有什么可以发、想写一条有流量的帖文，或反馈 X 帖文太复杂、读不下去时使用。只调整个人语气或忠实翻译已有文本时不触发。
More from lijigang/ljg-skills
All 26 skills in this repoWhole-Book Explainer Notes
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Explains a whole book to someone who has not read it, keeping its specific content and showing how its threads connect, and saves the result as an Org note.
Ljg Paper
lijigang/ljg-skills
Explain research papers to readers without a specialist background: what the paper studies, what the authors contribute, how the findings follow, and what the evidence does not establish.
Text to PNG Card Caster
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Turns text, URLs or local files into tall PNG cards through HTML typography, with four modes: long reading card, full-text layout, comic and whiteboard.
Classical Chinese Text Annotator
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Turns a named classical Chinese chapter, such as one from the Tao Te Ching or the Analects, into a single annotated PNG image with notes and commentary.
Constraint Engine
lijigang/ljg-skills
Finds the handful of constraints that truly define a domain, role, product or debate, grades each by hardness, and explains the behavior those constraints produce.
Offline HTML Talk Decks
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Builds single-file offline HTML talk decks from Org or Markdown outlines, with faithful layout or editorial condensing and keyboard navigation.
Questions about Ljg Is
What does Ljg Is do?
把一个名词或概念写成可使用的理解：先用普通话讲清它是什么、与相邻概念差在哪里，再说明它怎样运作、会改写什么判断，最后给出面对它时的行动抓手。USE WHEN 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用…. Ljg Is is an agent skill from lijigang/ljg-skills.
When should I use Ljg Is?
Ljg Is fits situations like: 用户问 X 是什么、怎么理解、意味着什么、为什么重要、以后怎样判断或使用；尤其适合技术概念、制度、产品、角色、方法、规范与实践。NOT FOR 单纯查事实、公式证明、逐步操作教程、纵向因果深挖（用 ljg-think）或母题结构（用 ljg-structure）.
How do I install Ljg Is in Claude Code?
Run `npx skills add lijigang/ljg-skills --skill ljg-is -a claude-code`. Or copy the skill folder (skills/ljg-is in lijigang/ljg-skills) into .claude/skills/ljg-is in your project. Claude Code loads it when a task matches its description.
How do I install Ljg Is in Codex?
Run `npx skills add lijigang/ljg-skills --skill ljg-is -a codex`. Or copy the skill folder (skills/ljg-is in lijigang/ljg-skills) into .agents/skills/ljg-is in your project. Codex loads it when a task matches its description.
Can I use Ljg Is in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add lijigang/ljg-skills --skill ljg-is -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ljg-is, .gemini/skills/ljg-is, .github/skills/ljg-is and .opencode/skills/ljg-is in your project.
What does Ljg Is need to run?
Going by SKILL.md and its folder, Ljg Is needs TypeScript for the scripts in its folder. Our summary lists: Node.js.
Does Ljg Is access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Ljg Is safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Ljg Is use?
Ljg Is is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ljg Is use?
About 671 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Ljg Is?
Skills that share tags, products or a category with Ljg Is: Ljg Xray Article (lijigang/ljg-skill-xray-article, 130 stars), Paper Explainer for Non-Specialists (lijigang/ljg-skill-paper, 138 stars), Light Idea Critique (Light0305/Light-skills, 640 stars) and Os Channel (CronusL-1141/AI-company, 371 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ljg Is?
lijigang (a GitHub user) maintains it in lijigang/ljg-skills, which has 7,481 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on October 8, 2026.
Source: lijigang/ljg-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.