sdd

Spec-Driven Development Assistant | 規格驅動開發助手

Create, review, and manage specification documents before writing code.

在撰寫程式碼前，建立、審查和管理規格文件。

When to Use /sdd vs uds spec | 何時使用

Scenario	/sdd	uds spec
Formal feature development with review cycle	✅	❌
Full spec lifecycle (Draft → Archived)	✅	❌
Quick prototyping / Vibe coding	❌	✅
Small incremental changes	❌	✅
Stakeholder sign-off required	✅	❌
Micro-spec from natural language intent	❌	✅

/sdd = Full specification lifecycle for formal development uds spec = Lightweight micro-specs for rapid iteration

/sdd = 正式開發的完整規格生命週期 uds spec = 快速迭代的輕量微規格

TL;DR Quick Checklist | 快速檢查清單

• Search existing specs: look in specs/, docs/specs/, or project spec directory
• Decide scope: new feature vs modify existing capability
• Pick a unique spec ID: SPEC-NNN or kebab-case change ID
• Write proposal with clear AC (Given/When/Then format)
• Get approval before implementation begins
• Implement tasks sequentially, verify against spec
• Archive spec after completion

Decision Tree | 決策樹

New request? | 新需求？
├─ Bug fix restoring spec behavior? → Fix directly | 直接修復
├─ Typo/format/comment? → Fix directly | 直接修復
├─ Dependency update (non-breaking)? → Fix directly | 直接修復
├─ New feature/capability? → Create proposal | 建立提案
├─ Breaking change? → Create proposal | 建立提案
├─ Architecture change? → Create proposal | 建立提案
├─ Agent/role definition (spans multiple features)? → Use spec-type: agent | 使用 Agent SPEC template
└─ Unclear? → Create proposal (safer) | 建立提案（較安全）

Workflow | 工作流程

DISCUSS ──► CREATE ──► REVIEW ──► APPROVE ──► IMPLEMENT ──► VERIFY ──► ARCHIVE

0. Discuss - Clarify Scope | 釐清範圍

Capture gray areas, establish governing principles, resolve ambiguities before writing spec.

1. Create - Write Spec | 撰寫規格

Define requirements, technical design, acceptance criteria, and test plan.

2. Review - Validate | 審查驗證

Check for completeness, consistency, and feasibility with stakeholders.

3. Approve - Sign Off | 核准

Get stakeholder sign-off before implementation begins.

4. Implement - Code | 實作

Develop following the approved spec, referencing requirements and AC.

5. Verify - Confirm | 驗證

Ensure implementation matches spec, all tests pass, AC satisfied.

6. Archive - Close | 歸檔

Archive completed spec with links to commits/PRs.

Spec States | 規格狀態

State	Description	說明
Draft	Work in progress	草稿中
Review	Under review	審查中
Approved	Ready for implementation	已核准
Implemented	Code complete	已實作
Archived	Completed or deprecated	已歸檔

Spec Structure | 規格結構

# [SPEC-ID] Feature: [Name]

## Overview
Brief description of the proposed change.

## Motivation
Why is this change needed? What problem does it solve?

## Requirements
### Requirement: [Name]
The system SHALL [behavior description].

#### Scenario: [Success case]
- **GIVEN** [initial context]
- **WHEN** [action performed]
- **THEN** [expected result]

## Acceptance Criteria
- AC-1: Given [context], when [action], then [result]

## Technical Design
[Architecture, API changes, database changes]

## Test Plan
- [ ] Unit tests for [component]
- [ ] Integration tests for [flow]

Agent SPEC Structure | Agent 規格結構（spec-type: agent）

# [SPEC-ID] Agent: [Role Name]
<!-- spec-type: agent -->
<!-- agent-id auto-referenced by feature SPECs -->

## Role Definition
- **Role**: [Agent Name]
- **Responsibility**: [One sentence]
- **Autonomy Level**: L[1-5] (per DEC-065)

## Capability Scope
**Owns:**
- [Capability 1]
- [Capability 2]

**Does NOT own:**
- [Explicit exclusion]

## Interface Contract
### Input
| Message Type | Required Fields | Optional Fields |
|---|---|---|
| [Type] | [fields] | [fields] |

### Output
| Artifact Type | Success Condition | Failure Condition |
|---|---|---|
| [Type] | [condition] | [condition] |

## Agent Interactions
- **Upstream**: [Who calls this agent]
- **Downstream**: [Who this agent calls]
- **Parallel**: [Agents working alongside]

## Related Feature SPECs
- [SPEC-NNN] — [This agent's role in that spec]

Scenario Formatting Rules | 場景格式規則

• Use #### Scenario: (h4 header) for each scenario
• Every requirement MUST have at least one scenario
• Use GIVEN/WHEN/THEN format for structured behavior
• Use SHALL/MUST for normative requirements, SHOULD for recommendations

Delta Operations | 變更操作

When modifying existing specs, use delta sections:

Operation	Description	說明
## ADDED Requirements	New capabilities	新增功能
## MODIFIED Requirements	Changed behavior	修改行為
## REMOVED Requirements	Deprecated features	移除功能
## RENAMED Requirements	Name changes	重新命名

Cross-Artifact Analysis (/sdd analyze) | 跨 artifact 一致性檢查

The executable face of the acceptance-criteria-traceability standard + forward-derivation single-spine principle (XSPEC-262). Validates that every test is a faithful projection of the AC spine across specs. 本命令是 acceptance-criteria-traceability + forward-derivation single-spine 的可執行面，驗證每個測試是否忠實投影 AC 主幹。

Signal	Meaning	Gate
orphan test	@AC AC-NNN references an AC no spec defines / 引用不存在的 AC	🔴 BLOCKING
uncovered	an AC has no @AC reference / AC 無測試引用	report only / 僅報告
not_implemented	AC marked so in its .ac.yaml / .ac.yaml 標記	🔴 BLOCKING before UAT
cross-spec conflict	same AC id defined in >1 spec / 同 AC id 跨多 spec	🔴 BLOCKING
orphan .feature	Gherkin @AC-N tag referencing a non-existent AC / @AC-N 引用不存在	🔴 BLOCKING
AC w/o scenario	AC has no .feature scenario (when BDD in use) / AC 無 BDD scenario	report only / 僅報告
user-guide drift	user-guide T-N with no matching journey/E2E test id / 手冊 T-N 無對應測試	🔴 BLOCKING

Coverage % uses the acceptance-criteria-traceability formula (not_implemented excluded). --json for CI.

npm run sdd:analyze -- --specs specs --tests tests [--userguide docs] [--json]

--userguide <dir> enables user-guide↔E2E drift detection (T-NNN, XSPEC-260/257). / 啟用手冊↔E2E drift 偵測。

vs /ac-coverage: ac-coverage = per-spec detailed AC↔test matrix；/sdd analyze = cross-spec/batch consistency + orphan detection（互補、不取代）。

Usage | 使用方式

/sdd                     - Interactive spec creation wizard | 互動式規格建立精靈
/sdd auth-flow           - Create spec for specific feature | 為特定功能建立規格
/sdd review              - Review existing specs | 審查現有規格
/sdd analyze             - Cross-artifact consistency check | 跨 artifact 一致性檢查
/sdd --sync-check        - Check sync status | 檢查同步狀態

Next Steps Guidance | 下一步引導

After /sdd completes, the AI assistant should suggest:

規格文件已建立。建議下一步 / Specification document created. Suggested next steps:

• 執行 /derive 從規格推導測試工件 ⭐ Recommended / 推薦 — Derive test artifacts from spec
• 執行 /derive bdd 僅推導 BDD 場景 — Derive BDD scenarios only
• 執行 /derive tdd 僅推導 TDD 骨架 — Derive TDD skeletons only
• 審查 AC 完整性，確保所有驗收條件可測試 — Review AC completeness
• 檢查 UDS 規範覆蓋率 → 執行 /audit --patterns — Check UDS standard coverage → Run /audit --patterns

Reference | 參考

• Detailed guide: guide.md
• Core standard: spec-driven-development.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：/sdd

For complete AI agent behavior definition, see the corresponding command file: /sdd