skill-design-guard

skill-design-guard is a cursor rule for Cursor from TashanGKD/tashan-cursor-skills. It costs 168 tokens per session (1,369 once invoked), scanned A, original, MIT.

A design rule for deciding whether a new or changed AI-agent component should be a skill, rule, or agent. It requires checking the system’s design principles before making changes.

In plain words
What is it for?
Use it when designing, reviewing, modifying, or improving skills, rules, or agents in the specified project directories.
Why use it?
It prevents components from being created in the wrong format or drifting away from the documents and responsibilities they are meant to follow.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit Use it when designing, reviewing, modifying, or improving skills, rules, or agents in the specified project directories.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/tashangkd/tashan-cursor-skills/skill-design-guard
Install

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.

Clone the repo
git clone --depth 1 https://github.com/TashanGKD/tashan-cursor-skills

Made for: Cursor.

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-design-guard

README.md
[![agentmods](https://agentmods.dev/badge/rules/tashangkd/tashan-cursor-skills/skill-design-guard/github.svg)](https://agentmods.dev/rules/tashangkd/tashan-cursor-skills/skill-design-guard)
Your own site
<a href="https://agentmods.dev/rules/tashangkd/tashan-cursor-skills/skill-design-guard"><img src="https://agentmods.dev/badge/rules/tashangkd/tashan-cursor-skills/skill-design-guard/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.

agentmods 80×15 button for skill-design-guard

Your own site · 80×15
<a href="https://agentmods.dev/rules/tashangkd/tashan-cursor-skills/skill-design-guard"><img src="https://agentmods.dev/badge/rules/tashangkd/tashan-cursor-skills/skill-design-guard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 168 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,369 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00168 $0.01369
Opus 5 $0.00084 $0.00685
Sonnet 5 $0.00034 $0.00274
Haiku 4.5 $0.00017 $0.00137

Measured 10d ago against content hash 412c5972f8e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

skill-design-guard 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 10d 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.

rules/skill-design-guard.mdc · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill/Rule/Agent 体系设计统一守门(skill-design-guard)

根因Skill体系设计原则_v1.0.md 有完整的三型决策树(§2.5),但连接机制依赖各 Skill 自行添加 D0 行,有系统性漏洞——遗漏了 D0 的 Skill 设计类任务看不到三型框架(如 role-Skill产品经理 v1.0 只知道建 Skill,不知道可以建 Rule/Agent)。

本规则将「先读原则文档」从 Skill 内部约定升级为体系级强制守门,对所有 Skill/Rule/Agent 设计类任务统一生效。


触发条件

以下任一场景触发本规则:

  • 准备新建、修改、完善任何 .cursor/skills/.cursor/rules/.cursor/agents/ 中的文件
  • 用户描述的任务含「Skill/Rule/Agent 设计/修改/完善/评审/优化」类语义
  • 触发了 skill-designerskill-rule-修改规范role-Skill产品经理 任一 Skill

强制前置步骤(触发后立即执行,不可跳过)

在进入任何 Skill/Rule/Agent 设计类操作前,必须先确认已读取:

Read: _内部总控/认知结构/L1_系统性文档/系统架构思维维度/Skill体系设计原则_v1.0.md

重点章节:
  §2.5 三型统一决策树(Rule / Agent / Skill 的选型判断)
  §4.3.5 认知根原则(每个组件的工作对应哪个 L1/L1.5 文档)
  §2.2 Rule 判断标准(三条:普遍约束 + 轻量 + 违反有后果)
  §2.4 Agent 判断标准(两种:独立视角 OR 并行执行)

带着以下两个问题进入后续操作:
  Q1. 这个需求应该建哪种类型?
      全局约束(轻量)→ Rule
      需要独立视角/并行 → Agent
      其他执行流程 → Skill
  Q2. 这个组件的认知根文档是什么?
      即:它执行的工作,对应认知结构中哪个 L1/L1.5 文档?

常见错误(本规则防止)

❌ 用户说「我有个 Skill 想法」
   → AI 直接进入 role-Skill产品经理 或 skill-designer 做 Skill 设计
   → 但该需求其实应建 Rule(全局约束)或 Agent(需要独立视角)
   ✅ 正确:先按 §2.5 决策树确认类型,再进入对应流程

❌ 用户说「修改这个 Skill」
   → AI 直接修改,未确认修改与认知根一致
   ✅ 正确:Step 1.5 读原则文档,确认修改不会让组件偏离认知根

❌ 体系不断新增 Skill 设计类 Skill,但每个都要手工加 D0 行才能看到三型框架
   ✅ 正确:本 Rule 统一守门,无论哪个 Skill 被触发都会有原则文档背景

与其他组件的关系

组件 关系 说明
skill-designer 本规则是其前置守门 skill-designer 自身也有 D0 行,两者双重保障
skill-rule-修改规范 本规则是其前置守门 修改规范 Step 1.5 也读原则文档,两者双重保障
role-Skill产品经理 本规则补全其缺失 v1.1 已补 D0,但本规则提供额外的体系级保障
Skill体系设计原则_v1.0.md 本规则的单一真源 所有三型判断知识来源于此,本规则只是导流入口

变更记录

v1.0 — 2026-03-23 — 初始创建

根因:严格基于代码分析发现:role-Skill产品经理 无知识导航表,不读 Skill体系设计原则_v1.0.md,导致只能处理 Skill 产品定义而不知道 Rule/Agent 类需求的存在。根本原因不是单个 Skill 的 D0 缺失,而是原则文档与 Skill 设计类任务的连接机制依赖人工逐个添加,有系统性漏洞——任何新建的 Skill 设计类 Skill 若忘记加 D0 就会落入盲区。

设计决策alwaysApply: false(条件触发)——仅在 Skill/Rule/Agent 设计类任务时激活,避免不相关任务注入额外 context。

配套修复:同步修改 role-Skill产品经理 v1.1,补充知识导航表 D0 + Step 0 三型确认。

Read the full file on GitHub · 92 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. 10d ago First seen · 92 lines · 168 tokens per session scan A 412c5972f8e4

Subscribe to this mod's changes

skill-design-guard is a cursor rule published in the GitHub repository TashanGKD/tashan-cursor-skills (20 stars, last pushed 5mo ago), licensed MIT. It adds 168 tokens to every session and 1,369 once invoked, about $0.0008 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.