doc-adr%3a-create-architecture-decision-records-(layer-5)（doc adr%3a 创建架构决策记录（第 5 层））

doc-adr

Purpose

Create Architecture Decision Records (ADR) - Layer 5 artifact in the SDD workflow that documents architectural decisions with rationale, alternatives, and consequences.

Layer: 5

Upstream: BRD (Layer 1), PRD (Layer 2), EARS (Layer 3), BDD (Layer 4)

Downstream Artifacts: SYS (Layer 6), REQ (Layer 7), Code (Execution Layer)

Prerequisites

Upstream Artifact Verification (CRITICAL)

Before creating this document, you MUST:

1. List existing upstream artifacts: ls docs/BRD/ docs/PRD/ docs/EARS/ docs/BDD/ docs/ADR/ docs/SYS/ docs/REQ/ 2>/dev/null
2. Reference only existing documents in traceability tags
3. Use null only when upstream artifact type genuinely doesn't exist
4. NEVER use placeholders like BRD-XXX or TBD
5. Do NOT create missing upstream artifacts - skip functionality instead

Before creating ADR, read:

1. Shared Standards: .claude/skills/doc-flow/SHARED_CONTENT.md
2. Technology Stack: docs/ADR/ADR-00_technology_stack.md (approved technologies)
3. Upstream BRD, PRD: Read Architecture Decision Requirements sections
4. Template: ai_dev_flow/ADR/ADR-TEMPLATE.md
5. Creation Rules: ai_dev_flow/ADR/ADR_CREATION_RULES.md
6. Validation Rules: ai_dev_flow/ADR/ADR_VALIDATION_RULES.md

When to Use This Skill

Use doc-adr when:

• Have identified architectural topics in BRD/PRD Architecture Decision Requirements sections
• Need to document technology choices with rationale
• Evaluating alternatives for architectural patterns
• Making decisions with long-term impact
• You are at Layer 5 of the SDD workflow

ADR Document Categories

Reserved ID Exemption (ADR-00_*)

Scope: Documents with reserved ID 000 are FULLY EXEMPT from validation.

Pattern: ADR-00_*.md

Document Types: Index, Traceability matrix, Glossaries, Registries, Checklists

Validation Behavior: Skip all checks when filename matches ADR-00_* pattern.

ADR-Specific Guidance

1. Four-Part ADR Structure (17 Sections Total)

Full Template: See ai_dev_flow/ADR/ADR-TEMPLATE.md for complete 17-section structure.

Part 1 - Decision Context and Requirements (Sections 1-6):

• Document Control, Workflow Position, Status, Context, Decision, Requirements Satisfied

Part 2 - Impact Analysis and Architecture (Sections 7-12):

• Consequences, Architecture Flow, Implementation Assessment, Impact Analysis, Verification, Alternatives Considered

Part 3 - Implementation and Operations (Sections 13-15):

• Security, Related Decisions, Implementation Notes

Part 4 - Traceability and Documentation (Sections 16-17):

• Traceability, References

2. ADR Lifecycle States

Proposed: Decision under consideration

• Still evaluating alternatives
• Seeking stakeholder feedback
• Not yet implemented

Accepted: Decision approved and active

• Chosen as the path forward
• Implementation can proceed
• Should be followed by all

Deprecated: Decision no longer recommended

• Better alternative found
• Context changed
• Not deleted (historical record)

Superseded by ADR-XXX: Replaced by newer decision

• Links to replacing ADR
• Explains why replaced
• Maintains audit trail

3. SYS-Ready Scoring System

Purpose: Measures ADR maturity and readiness for progression to System Requirements (SYS) phase.

Format in Document Control:

| **SYS-Ready Score** | ✅ 95% (Target: ≥90%) |

Status and SYS-Ready Score Mapping:

Scoring Criteria:

• Decision Completeness (30%): Context/Decision/Consequences/Alternatives process
• Architecture Clarity (35%): Mermaid diagrams (REQUIRED - no text-based diagrams), component responsibilities, cross-cutting concerns
• Implementation Readiness (20%): Complexity assessment, dependencies, rollback strategies
• Verification Approach (15%): Testing strategy, success metrics, operational readiness

Quality Gate: Score <90% blocks SYS artifact creation.

4. Element ID Format (MANDATORY)

Pattern: ADR.{DOC_NUM}.{ELEM_TYPE}.{SEQ} (4 segments, dot-separated)

REMOVED PATTERNS - Do NOT use legacy formats:

• ❌ DEC-XXX → Use ADR.NN.10.SS
• ❌ ALT-XXX → Use ADR.NN.12.SS
• ❌ CON-XXX → Use ADR.NN.13.SS

Reference: ID_NAMING_STANDARDS.md

5. Threshold Management

Dual Role: ADR documents both reference and define thresholds.

Reference platform-wide thresholds from PRD threshold registry:

performance:
  - "@threshold: PRD.NN.perf.api.p95_latency"
sla:
  - "@threshold: PRD.NN.sla.uptime.target"

Define architecture-specific thresholds unique to this decision:

circuit_breaker:
  - "@threshold: ADR.NN.circuit.failure_threshold"
  - "@threshold: ADR.NN.circuit.recovery_timeout"
retry:
  - "@threshold: ADR.NN.retry.max_attempts"
caching:
  - "@threshold: ADR.NN.cache.ttl_seconds"

6. File Size Limits

• Target: 300-500 lines per file
• Maximum: 600 lines per file (absolute)
• If document approaches/exceeds limits, split into section files

Tag Format Convention (By Design)

Key Distinction:

• @adr: ADR-033 → Points to the document ADR-033_risk_limit_enforcement.md
• @brd: BRD.17.01.30 → Points to element 01.30 inside document BRD-017.md

Cumulative Tagging Requirements

Layer 5 (ADR): Must include tags from Layers 1-4 (BRD, PRD, EARS, BDD)

Tag Count: 4 tags (@brd, @prd, @ears, @bdd)

Format:

## Traceability

**Required Tags** (Cumulative Tagging Hierarchy - Layer 5):

@brd: BRD.01.01.30
@prd: PRD.01.07.02
@ears: EARS.01.25.01
@bdd: BDD.01.14.01

Upstream Sources:

• BRD-01 - Architecture Decision Requirements
• PRD-01 - Product requirements
• EARS-01 - Formal requirements (EARS type code: 25)
• BDD-01 - Test scenarios (BDD scenario type code: 14)

Upstream/Downstream Artifacts

Upstream Sources:

• BRD (Layer 1) - Architecture Decision Requirements section
• PRD (Layer 2) - Architecture Decision Requirements section
• EARS (Layer 3) - Formal requirements constraints
• BDD (Layer 4) - Test scenarios validating decision

Downstream Artifacts:

• SYS (Layer 6) - System requirements implementing decision
• REQ (Layer 7) - Atomic requirements following decision
• Code (Execution Layer) - Implementation per decision

Upstream-Only Traceability Policy:

The ADR traceability matrix tracks ADRs and their upstream sources (BRD, PRD, EARS, BDD) only. Downstream documents (SYS, REQ, SPEC) track their own upstream references to ADRs—the ADR matrix does NOT maintain downstream links.

Same-Type Document Relationships (conditional):

• @related-adr: ADR-NN - ADRs sharing architectural context
• @depends-adr: ADR-NN - ADR that must be decided first

Creation Process

Step 1: Identify Decision Topic

From BRD/PRD Architecture Decision Requirements sections, identify topic needing decision.

Step 2: Read Technology Stack

Check docs/ADR/ADR-00_technology_stack.md for approved technologies.

Step 3: Reserve ID Number

Check docs/ADR/ for next available ID number (e.g., ADR-01, ADR-33).

ID Numbering Convention: Start with 2 digits and expand only as needed.

• ✅ Correct: ADR-01, ADR-99, ADR-102
• ❌ Incorrect: ADR-001, ADR-033 (extra leading zero not required)

Special IDs:

• ADR-000: Reserved for Technology Stack reference
• ADR-01 onwards: Regular decision records

Step 4: Create ADR Folder and Files

Folder structure (DEFAULT - nested folder per document):

1. Create folder: docs/ADR/ADR-NN_{slug}/ (folder slug MUST match index file slug)
2. Create index file: docs/ADR/ADR-NN_{slug}/ADR-NN.0_{slug}_index.md
3. Create section files: docs/ADR/ADR-NN_{slug}/ADR-NN.S_{section_type}.md

Example (Section-Based Pattern - DEFAULT):

docs/ADR/ADR-033_database_selection/
├── ADR-033.0_database_selection_index.md
├── ADR-033.1_context.md
├── ADR-033.2_decision.md
└── ADR-033.3_consequences.md

OPTIONAL (for small documents <25KB): docs/ADR/ADR-NN_{slug}.md (monolithic)

Step 5: Fill Document Control Section

Complete all required metadata fields and initialize Document Revision History table.

Required Fields (7 mandatory):

• Project Name, Document Version, Date, Document Owner, Prepared By, Status, SYS-Ready Score

Step 6: Document Context (Section 4)

Context Section: Explain the problem and factors:

• What issue are we addressing?
• What constraints exist?
• What requirements drive this decision?
• Reference upstream BRD/PRD sections

Section 4.1 Problem Statement includes inherited content:

• Business Driver (from BRD §7.2)
• Business Constraints (from BRD §7.2)
• Technical Options Evaluated (from PRD §18)
• Evaluation Criteria (from PRD §18)

Step 7: State Decision (Section 5)

Decision Section: Clear, concise statement:

• What are we choosing to do?
• How will it be implemented?
• Reference technology stack (ADR-000) if applicable

Step 8: Analyze Consequences (Section 7)

Consequences Section:

• Positive: Benefits and advantages
• Negative: Drawbacks and limitations
• Risks: Potential issues and mitigations

Step 9: Document Alternatives (Section 12)

Alternatives Considered: For each alternative:

• Name and description
• Pros and cons
• Why rejected
• Fit Score (Poor/Good/Better)

Step 10: Define Verification (Section 11)

Verification Section: How to validate decision:

• BDD scenarios that test it
• Success metrics
• Performance benchmarks

Step 11: Add Relations (Section 14)

Related Decisions Section:

• Supersedes: Which ADR this replaces
• Related to: Connected ADRs
• Influences: Which SYS/REQ depend on this

Step 12: Add Cumulative Tags (Section 16.6)

Include @brd, @prd, @ears, @bdd tags (Layers 1-4).

Step 13: Create/Update Traceability Matrix

MANDATORY: Update docs/ADR/ADR-00_TRACEABILITY_MATRIX.md

• Add ADR entry with upstream sources only (BRD, PRD, EARS, BDD)
• Do NOT add downstream links (SYS, REQ track their own references to ADRs)

Step 14: Commit Changes

Commit ADR and traceability matrix.

Validation

Validation Checks (8 Total)

Validation Tiers

Automated Validation

# Per-document validation (Phase 1)
python ai_dev_flow/scripts/validate_cross_document.py --document docs/ADR/ADR-NN_slug.md --auto-fix

# Layer validation (Phase 2) - run when all ADR documents complete
python ai_dev_flow/scripts/validate_cross_document.py --layer ADR --auto-fix

# Cumulative tagging validation
python ai_dev_flow/scripts/validate_tags_against_docs.py --artifact ADR-NN --expected-layers brd,prd,ears,bdd --strict

Manual Checklist

• Document Control section at top with 7 required fields
• Status field completed (Proposed/Accepted/Deprecated/Superseded)
• SYS-Ready Score with ✅ emoji and percentage
• Context explains problem and constraints
• Decision clearly stated
• Consequences analyzed (positive, negative, risks)
• Alternatives considered and documented with rejection rationale
• Verification approach defined
• Relations to other ADRs documented
• Technology Stack (ADR-000) referenced if applicable
• Cumulative tags: @brd, @prd, @ears, @bdd included
• Element IDs use unified format (ADR.NN.TT.SS)
• No legacy patterns (DEC-XXX, ALT-XXX, CON-XXX)
• Traceability matrix updated

Post-Creation Validation (MANDATORY - NO CONFIRMATION)

CRITICAL: Execute this validation loop IMMEDIATELY after document creation. Do NOT proceed to next document until validation passes.

Automatic Validation Loop

LOOP:
  1. Run: python ai_dev_flow/scripts/validate_cross_document.py --document {doc_path} --auto-fix
  2. IF errors fixed: GOTO LOOP (re-validate)
  3. IF warnings fixed: GOTO LOOP (re-validate)
  4. IF unfixable issues: Log for manual review, continue
  5. IF clean: Mark VALIDATED, proceed

Layer-Specific Upstream Requirements

Auto-Fix Actions (No Confirmation Required)

Validation Codes Reference

Quality Gate

Blocking: YES - Cannot proceed to SYS creation until Phase 1 validation passes with 0 errors.

Common Pitfalls

1. No alternatives: Must document why other options rejected
2. Missing technology stack check: Always check ADR-000 first
3. Vague consequences: Be specific about impacts
4. No verification: Must define how to validate decision
5. Missing cumulative tags: Layer 5 must include Layers 1-4 tags
6. Legacy element IDs: Use ADR.NN.TT.SS not DEC-XXX/ALT-XXX/CON-XXX
7. Wrong SYS-Ready Score format: Must include ✅ emoji and percentage

ADR-REF Reference Documents

For supplementary documentation related to ADR artifacts:

• Format: ADR-REF-NNN_{slug}.md
• Skill: Use doc-ref skill
• Validation: Reduced (4 checks only)
• Examples: Technology stack summaries, architecture overviews

ADR-REF Reduced Validation

Applicable Checks (4 total):

• CHECK 1 (partial): Document Control Fields (required)
• Document Revision History (required)
• Status/Context sections only (required)
• H1 ID match with filename (required)

Exempted (NO SCORES):

• SYS-Ready Score: NOT APPLICABLE
• Cumulative tags: NOT REQUIRED
• CHECK 5-7: Decision quality, architecture, implementation (exempt)
• All quality gates and downstream readiness metrics: EXEMPT

Purpose: ADR-REF documents are reference targets that other documents link to. They provide supporting information, context, or external references but do not define formal architecture decisions.

Next Skill

After creating ADR, use:

doc-sys - Create System Requirements (Layer 6)

The SYS will:

• Implement ADR architectural decisions
• Include @brd, @prd, @ears, @bdd, @adr tags (cumulative)
• Define functional requirements and quality attributes
• Translate ADR decisions into technical requirements

Related Resources

• Template: ai_dev_flow/ADR/ADR-TEMPLATE.md (primary authority)
• Schema: ai_dev_flow/ADR/ADR_SCHEMA.yaml (machine-readable validation)
• Technology Stack: docs/ADR/ADR-00_technology_stack.md
• ADR Creation Rules: ai_dev_flow/ADR/ADR_CREATION_RULES.md
• ADR Validation Rules: ai_dev_flow/ADR/ADR_VALIDATION_RULES.md
• ADR README: ai_dev_flow/ADR/README.md
• Shared Standards: .claude/skills/doc-flow/SHARED_CONTENT.md

Section Templates (DEFAULT for all ADR documents):

• Structure: docs/ADR/ADR-NN/ADR-NN.S_slug.md (nested folder per document)
• Index template: ai_dev_flow/ADR/ADR-SECTION-0-TEMPLATE.md
• Content template: ai_dev_flow/ADR/ADR-SECTION-TEMPLATE.md
• Reference: ai_dev_flow/ID_NAMING_STANDARDS.md (Section-Based File Splitting)
• Note: Monolithic template is OPTIONAL for small documents (<25KB)

Quick Reference

ADR Purpose: Document architectural decisions with rationale

Layer: 5

Tags Required: @brd, @prd, @ears, @bdd (4 tags)

Format: Four-Part Structure (17 sections)

SYS-Ready Score: ≥90% required for "Accepted" status

Element ID Format: ADR.NN.TT.SS (Decision=10, Alternative=12, Consequence=13)

File Size: 300-500 lines target, 600 max

Lifecycle States: Proposed → Accepted → Deprecated/Superseded

Critical: Always check ADR-000 Technology Stack first

Next: doc-sys