# Check Versions

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-yli769227-jpg-agent-discipline-check-versions`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [yli769227-jpg](https://agentstack.voostack.com/s/yli769227-jpg)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [yli769227-jpg](https://github.com/yli769227-jpg)
- **Source:** https://github.com/yli769227-jpg/agent-discipline/tree/main/skills/check-versions

## Install

```sh
agentstack add skill-yli769227-jpg-agent-discipline-check-versions
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Check Versions / 先测炉温，再铸剑

> The API you remember and the API that's installed are not the same API until you've checked.
> 你记得的 API 和实际装着的 API,在你查证之前不是同一个 API。

## The discipline / 纪律

1. **Verify the version first** — run the version-check command, confirm the actual runtime/library version.
   **先确认版本**:执行版本检查命令,确认实际运行时/库版本。
2. **Then read the docs** — confirm how the feature actually behaves *in that version*.
   **再查文档**:用官方文档确认该版本下特性的实际行为。
3. **Then write code** — built on the confirmed version and docs.
   **后写代码**:基于已确认的版本和文档开发。

**Forbidden:** writing code that depends on a specific language feature based on a version assumption from training data.
**绝对禁止:** 基于训练数据里的版本假设,直接写依赖特定特性的代码。

## When this triggers / 触发时机

- About to use any concrete language / runtime / SDK / framework API.
- You suspect "I remember it's written like this" but aren't sure.
- A version-sensitive error (ESM/CJS, Python 3.x behavior diffs, deprecated Node APIs).
- Porting a snippet across projects.

## Done criterion (verifiable) / 完成判据（可验证）

✅ You pasted the actual version-check command and its output (e.g. `node -v` → `v18.20.4`) and cited the docs section/URL for *that* version — not just "I checked".
⚠️ You couldn't verify the version — say so, and mark the code as needing a version check.
❌ You wrote API-dependent code from memory with no version check. Stop and verify.

## Worked examples / 实战反例

Real before/after cases for this discipline live in [EXAMPLES.md](./EXAMPLES.md) — read them before you act.
本纪律的真实 before/after 反例见 [EXAMPLES.md](./EXAMPLES.md) —— 动手前先对照。

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [yli769227-jpg](https://github.com/yli769227-jpg)
- **Source:** [yli769227-jpg/agent-discipline](https://github.com/yli769227-jpg/agent-discipline)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-yli769227-jpg-agent-discipline-check-versions
- Seller: https://agentstack.voostack.com/s/yli769227-jpg
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.