# Requirement

> [UDS] Write user stories and requirements that satisfy the INVEST criteria. Use when: turning a feature idea into a user story, defining testable acceptance criteria, checking a backlog item for quality. Not for: full specification documents with design and delta operations — use /sdd; deciding whether the idea is right at all — use /brainstorm. Keywords: requirement, user story, INVEST, acceptance criteria, backlog refinement, 需求, 使用者故事, 驗收條件.

- Skill: `asiaostrich/requirement` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add asiaostrich/requirement`
- Raw SKILL.md: https://api.skillmd.com/api/skills/asiaostrich/requirement/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Product & Planning
- Author: AsiaOstrich (https://skillmd.com/u/asiaostrich)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/asiaostrich/requirement

---


# Requirement Assistant | 需求助手

Write well-structured user stories and requirements following INVEST criteria.

撰寫結構良好的使用者故事和需求文件，遵循 INVEST 準則。

## Workflow | 工作流程

1. **Understand context** - Gather feature information | 蒐集功能資訊
2. **Identify stakeholders** - Who benefits from this feature? | 誰受益？
3. **Write user story** - Follow the standard format | 遵循標準格式
4. **Define acceptance criteria** - Specific, testable conditions | 定義可測試條件
5. **Validate with INVEST** - Check quality criteria | 用 INVEST 驗證品質

## User Story Format | 使用者故事格式

```markdown
As a [role],
I want [feature],
So that [benefit].

### Acceptance Criteria

- [ ] Given [context], when [action], then [result]
- [ ] Given [context], when [action], then [result]
```

## INVEST Criteria | INVEST 準則

| Criterion | Description | 說明 |
|-----------|-------------|------|
| **I**ndependent | Can be developed separately | 可獨立開發 |
| **N**egotiable | Details can be discussed | 可協商細節 |
| **V**aluable | Delivers value to user | 提供使用者價值 |
| **E**stimable | Can estimate effort | 可估算工作量 |
| **S**mall | Fits in one sprint | 適合單一迭代 |
| **T**estable | Has clear test criteria | 有明確測試標準 |

## Quality Checklist | 品質檢查清單

- [ ] User story follows "As a / I want / So that" format
- [ ] At least 2 acceptance criteria defined
- [ ] All 6 INVEST criteria satisfied
- [ ] Edge cases and error scenarios considered
- [ ] Out of scope items documented

## Usage | 使用方式

```
/requirement                         - Interactive requirement wizard | 互動式需求精靈
/requirement user login              - Write requirement for feature | 為功能撰寫需求
/requirement "users can export data" - Based on description | 根據描述撰寫
```

## Next Steps Guidance | 下一步引導

After `/requirement` completes, the AI assistant should suggest:

> **需求文件已完成。建議下一步 / Requirement document complete. Suggested next steps:**
> - 執行 `/sdd` 建立規格文件 ⭐ **Recommended / 推薦** — Create a specification document
> - 執行 `/atdd` 定義驗收測試 — Define acceptance tests
> - 執行 `/brainstorm` 進一步探索需求空間 — Explore the requirement space further

## Reference | 參考

- [Requirement Completeness Checklist](./requirement-checklist.md) — Read it when checking a requirement is complete before it is accepted.
- [Requirement Writing Guide](./requirement-writing.md) — Read it when writing a requirement from scratch.
- Detailed guide: [guide.md](./guide.md)
- Core standard: [requirement-engineering.md](../../core/requirement-engineering.md)


## AI Agent Behavior | AI 代理行為

> 完整的 AI 行為定義請參閱對應的命令文件：[`/requirement`](../commands/requirement.md#ai-agent-behavior--ai-代理行為)
>
> For complete AI agent behavior definition, see the corresponding command file: [`/requirement`](../commands/requirement.md#ai-agent-behavior--ai-代理行為)