skill-installer

skill-installer is a skill for Claude Code, Codex from yipng05-max/-skills. It costs 143 tokens per session (2,399 once invoked), scanned D, original, MIT.

A workflow for installing Claude Code skills from GitHub, URLs, local files, directories, or pasted SKILL.md content. It reviews the skill before writing it to the installation folder.

In plain words
What is it for?
Use it to install a skill from a repository, web address, local path, or pasted file after its contents have been retrieved and reviewed.
Why use it?
It helps avoid installing inaccessible or unsafe skill content and gives the installation process a consistent set of checks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else. The line is /Users/me/Downloads/my-skill/SKILL.md.

Good fit Use it to install a skill from a repository, web address, local path, or pasted file after its contents have been retrieved and reviewed.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.

Made for: Claude Code, Codex.

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 skill-installer

README.md
[![agentmods](https://agentmods.dev/badge/skills/yipng05-max/-skills/skill-installer.svg)](https://agentmods.dev/skills/yipng05-max/-skills/skill-installer)
Your own site
<a href="https://agentmods.dev/skills/yipng05-max/-skills/skill-installer"><img src="https://agentmods.dev/badge/skills/yipng05-max/-skills/skill-installer.svg" alt="Measured on agentmods" height="20"></a>
Per session 143 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,399 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 4 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00143 $0.02399
Opus 5 $0.00072 $0.01200
Sonnet 5 $0.00029 $0.00480
Haiku 4.5 $0.00014 $0.00240

Measured 8d ago against content hash 64d7abbe0357, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade D, and why

skill-installer scanned grade D with 4 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 8d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

□ 请求 sudo 或提权操作

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

ls ~/.claude/skills/[name]/

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

# 使用 Bash 工具:rm -rf ~/.claude/skills/[name]/

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "https://api.github.com/repos/OWNER/REPO"
skill-installer/SKILL.md · 315 lines

How it starts

The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill 安装工具(Skill Installer)

本 skill 提供标准化的 skill 安装流程:获取内容 → 安全审查 → 确认安装 → 写入文件。

安装目录~/.claude/skills/<skill-name>/SKILL.md


支持的输入格式

格式 示例
GitHub 路径 owner/repoowner/repo/skill-name
原始文件 URL https://raw.githubusercontent.com/...
第三方平台 URL https://skillsmp.com/skills/...
本地文件路径 /path/to/SKILL.md 或本地目录
直接粘贴内容 用户在对话中粘贴了 SKILL.md 的完整内容

执行流程

收到安装请求后,严格按顺序执行以下五个阶段。


第一阶段:解析来源

根据用户提供的输入,判断来源类型并获取内容:

来源类型 A:GitHub 路径(owner/repoowner/repo/skill-name
# 1. 获取仓库基本信息
curl -s "https://api.github.com/repos/OWNER/REPO"

# 2. 列出 skills 目录(如果有)
curl -s "https://api.github.com/repos/OWNER/REPO/contents/skills/SKILL_NAME"

# 3. 获取 SKILL.md 原始内容
curl -s "https://raw.githubusercontent.com/OWNER/REPO/main/skills/SKILL_NAME/SKILL.md"
# 如果 main 分支不存在,尝试 master 分支

记录:Stars、最后更新时间、作者、文件列表。

来源类型 B:原始文件 URL

使用 WebFetch 工具直接获取 URL 内容。 记录:域名来源、是否为已知可信平台。

来源类型 C:第三方平台 URL

使用 WebFetch 工具获取内容。 如果 WebFetch 失败(不可访问),立即终止,输出:

❌ 安装终止:无法访问来源 URL,内容不可审查,拒绝安装。
建议:请提供 GitHub 仓库路径或直接粘贴 SKILL.md 内容。
来源类型 D:本地文件路径

使用 Read 工具读取本地 SKILL.md 文件。 如果是目录路径,尝试读取 <路径>/SKILL.md

来源类型 E:直接粘贴内容

用户已在对话中提供了完整的 SKILL.md 内容,直接进入审查阶段。 记录:来源为"用户直接提供",无外部来源信息。


第二阶段:安全审查(不可跳过)

对获取到的 SKILL.md 内容执行以下审查,任何一条红线触发即终止安装

🚨 红线检查(触发任意一条 → 立即终止)

逐行扫描 SKILL.md 内容,检查:

□ curl/wget 指向未知域名(非 GitHub/NPM/PyPI 等已知平台)
□ 将数据发送到外部服务器(POST 请求、数据上报)
□ 读取凭证文件:~/.ssh、~/.aws、~/.config、.env、*_key、*_token
□ 读取或修改 MEMORY.md、CLAUDE.md、USER.md 等配置文件
□ 使用 base64 解码后执行
□ eval() 或 exec() 接收外部输入
□ 请求 sudo 或提权操作
□ 读取浏览器 cookies 或 session 数据
□ 混淆代码(大段 base64、压缩代码、hex 编码)
□ 向 IP 地址(非域名)发起网络请求
□ 安装系统级软件包(brew install、apt-get 等)而未明确说明用途

如果触发红线:

❌ 安装终止:发现安全红线
红线类型:[具体描述]
位置:[在 SKILL.md 的哪个部分]
原因:[为什么这是危险的]
建议:请联系 skill 作者确认,或放弃安装。
⚠️ 风险评估(不触发红线则继续,但输出风险等级)

评估以下维度:

  • 文件权限:skill 需要读写哪些文件?范围是否合理?
  • 网络访问:需要访问哪些外部服务?目的是否清晰?
  • 命令执行:执行哪些 shell 命令?是否有潜在风险?
  • 来源可信度:作者是否已知?仓库是否有活跃维护?

Read the full file on GitHub · 315 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.

  1. 8d ago First seen · 315 lines · 143 tokens per session scan D 64d7abbe0357

Subscribe to this mod's changes

skill-installer is a skill published in the GitHub repository yipng05-max/-skills (284 stars, last pushed 4mo ago), licensed MIT. It adds 143 tokens to every session and 2,399 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it D with 4 findings (asks for root, enumerates other installed skills, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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