Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add yan-labs/yan-skills --skill skill-link-checkgit clone --depth 1 https://github.com/yan-labs/yan-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/skills/yan-labs/yan-skills/skill-link-check)<a href="https://agentmods.dev/skills/yan-labs/yan-skills/skill-link-check"><img src="https://agentmods.dev/badge/skills/yan-labs/yan-skills/skill-link-check/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/skills/yan-labs/yan-skills/skill-link-check"><img src="https://agentmods.dev/badge/skills/yan-labs/yan-skills/skill-link-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 6 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 17 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 20 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Agent Snooping · line 3 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium MCP Rug Pull · line 14 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 17 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 20 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00064 | $0.01012 |
| Opus 5.5 | $0.00026 | $0.00405 |
| Sonnet 5.5 | $0.00013 | $0.00202 |
| Haiku 4.5 | $0.00006 | $0.00101 |
Grade A, and why
skill-link-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Skill Link Check
安装与更新
来源：Skills.sh
# 首次全局安装，或更新失败时重新安装
npx skills add yan-labs/yan-skills --skill skill-link-check -g -y
# 更新已安装的全局 Skill
npx skills update skill-link-check -g -y
若使用项目级安装，去掉安装命令中的 -g；项目级更新使用 npx skills update skill-link-check -p -y。
本 Skill 只审计目录布局，不自动移动、删除或覆盖文件：
.agents/skills/<name>/保存真实源文件。.claude/skills要么整体链接到.agents/skills，要么通过逐个子项链接镜像它。
最常见的漂移是 Skill 被直接创建成 .claude/skills/<name>/ 真实目录，却没有进入 .agents/skills/。它看似已安装，实际不会随正常备份、同步或迁移流程保存。
完成条件与退出码
在 /goal 或持续执行任务里，以审计证据完整为完成条件：从目标项目运行脚本，报告每个适用作用域的布局、问题分类和退出状态。有问题时列数量、路径和建议命令；无问题时报告 clean。脚本不修改被审计目录。
0：审计完成且无问题。1：审计完成且发现问题；这仍是有效结果。- Python traceback、参数错误或目标不可读：执行失败，查明后重跑。
运行方式
python3 "$(dirname "$0")/check.py"
默认审计：
- Project：当前目录下的
.agents/skills与.claude/skills。 - Global：
$HOME下的同名目录。
自动化或 checker 可使用：
# 明确指定项目，避免依赖当前工作目录
python3 "$(dirname "$0")/check.py" --project-root /path/to/project
# 只查一个作用域
python3 "$(dirname "$0")/check.py" --project-only
python3 "$(dirname "$0")/check.py" --global-only
# 输出稳定 JSON 证据；发现问题时仍返回 1
python3 "$(dirname "$0")/check.py" --json
两种合法布局
两种模式都应通过：
- Parent symlink：
.claude/skills本身指向.agents/skills。新增 Skill 自动保持一致。 - Per-child symlinks：
.claude/skills是真实目录，每个.claude/skills/<name>指向../../.agents/skills/<name>。
脚本会自动识别模式，不要求为了统一风格而改造一个本来健康的布局。
问题分类
orphan-in-claude：.claude/skills/中有真实条目，但.agents/skills/没有对应源文件。报告时优先列出。missing-link：源 Skill 存在，但运行时镜像缺失。not-symlink：逐子项模式下，镜像位置是重复的真实文件或目录。broken-symlink：链接目标不存在，包括损坏的父级链接。wrong-target：链接存在，但指向错误 Skill 或.agents/skills之外。
报告规则
- 先给总问题数和分类计数；有
orphan-in-claude时先报告它。 - 每项给出名称、证据路径和一行解释。
- 原样附上脚本生成的建议修复命令，便于用户复核后执行。
- 不自动修复。孤儿目录可能是用户尚未迁移的工作，重复目录也可能已经分叉；自动移动或删除会造成数据损失。
- 如果全部健康，一句话说明适用作用域及布局模式即可结束。
验证 Skill 自身
python3 -m unittest discover -s "$(dirname "$0")/tests" -v
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago Changed · -8 lines · -57 tokens per session 40a496296aa1
- 2mo ago First seen · 100 lines · 121 tokens per session scan A 914ae8dc9f82
skill-link-check is a skill published in the GitHub repository yan-labs/yan-skills (228 stars, last pushed 2d ago), licensed MIT. It adds 64 tokens to every session and 1,012 once invoked, about $0.0003 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.
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