spec-rules-init — Coding Rules Generator

Extract project conventions and generate a unified coding-rules.md for use as a quality gate during implementation.

Language Rules

1. Auto-detect input language → output in the same language
2. Japanese input → Japanese output, use references/rules-template.ja.md
3. English input → English output, use references/rules-template.md
4. Explicit override takes priority (e.g., "in English", "日本語で")

Execution Flow

Step 0: Initial Context Check

BEFORE any interaction, execute these checks:

1. Check current directory:

   pwd
   ls -la
   

2. Detect convention files (parallel where possible):

   # Convention files
   ls CLAUDE.md src/CLAUDE.md AGENTS.md test/CLAUDE.md 2>/dev/null
   ls -d .claude/ 2>/dev/null
   
   # Config files
   ls package.json go.mod requirements.txt Cargo.toml 2>/dev/null
   ls .eslintrc* biome.json tsconfig.json .prettierrc* 2>/dev/null
   

3. Detect existing source code:

   find . -maxdepth 3 -type f \( -name "*.ts" -o -name "*.js" -o -name "*.py" -o -name "*.go" -o -name "*.java" -o -name "*.rs" \) 2>/dev/null | head -30
   

4. Scan installed skills:

   ls ~/.claude/skills/*/SKILL.md .claude/skills/*/SKILL.md 2>/dev/null
   

5. Check for existing coding-rules.md:

   find . -name "coding-rules.md" -type f 2>/dev/null
   

Step 1: Rule Extraction from Convention Files

Read detected convention files and extract rules by category.

Detection targets (by priority):

Extraction categories and keywords:

• Testing Standards: "coverage", "test", "spec", "E2E", "カバレッジ", "テスト"
• Code Quality: "lint", "typecheck", "strict", "import", "naming", "命名"
• Error Handling: "try/catch", "Logger", "error", "throw", "例外"
• Documentation: "JSDoc", "TSDoc", "@ApiProperty", "comment", "コメント"
• Security: "secret", "password", "hash", "HTTPS", "ログに出力しない"
• Git: "commit", "branch", "コミットメッセージ", "feature branch"

For each extracted rule, record:

• Category (one of the 6 above)
• Content (the rule text)
• Severity: [MUST] (explicit requirement), [SHOULD] (recommended), [MAY] (optional)
• Source file and line reference

Rules from CLAUDE.md / AGENTS.md are Priority 1 and default to [MUST].

Step 2: Codebase Analysis

If source code exists, analyze the codebase to detect implicit conventions. Skip this step entirely if no source files are found (new project).

2a. Directory structure analysis:

• Scan directory tree (up to 3 levels deep)
• Detect patterns: feature-based (modules/{feature}/), layer-based (controllers/, services/), co-located tests vs separate tests/ directory

2b. File naming convention detection:

1. Collect file names under src/ (or primary source directory)
2. Classify each name: kebab-case, camelCase, PascalCase, snake_case
3. If one pattern is 60%+ of files → propose as [MUST]
4. Minority patterns → propose as [SHOULD] for unification

2c. Library analysis:

1. Read dependency file (package.json, go.mod, requirements.txt, etc.)
2. Identify major libraries:
   • Frameworks: NestJS, Next.js, Express, Fastify, Django, Flask, Gin, etc.
   • Testing: Jest, Vitest, Playwright, pytest, etc.
   • Validation: Zod, class-validator, Joi, etc.
   • ORM: Prisma, TypeORM, Drizzle, SQLAlchemy, GORM, etc.
   • Linters: ESLint, Biome, ruff, golint, etc.
3. Add library-specific best practice recommendations as [SHOULD] rules
   • Example: Prisma detected → [SHOULD] Use Prisma Client for all DB access
   • Example: Zod detected → [SHOULD] Use Zod for runtime validation

2d. Code pattern analysis (if code intelligence tools are available):

• Import style: relative (./) vs path alias (@/)
• Export style: named exports vs default exports
• Error handling patterns in use

2e. Shared utility and library detection:

1. Scan the codebase for shared utility modules, helper functions, and internal libraries:
   • Look for directories named utils/, helpers/, lib/, shared/, common/
   • Identify frequently imported internal modules
2. Cross-reference with dependency file to identify commonly used libraries
3. Present a summary of detected shared utilities and libraries to the user:

   Detected shared utilities and libraries:
     Internal: utils/logger.ts, lib/validation.ts, helpers/date.ts
     External: Zod (validation), Prisma (DB), date-fns (dates)
   

4. For each detected shared utility or library, generate a [SHOULD] rule:
   • Example: [SHOULD] Use lib/validation.ts for input validation
   • Example: [SHOULD] Use Zod for runtime validation
   • Example: [SHOULD] Use utils/logger.ts instead of console.log
5. Include the detected list in the generated coding-rules.md under a "Shared Utilities" section

Codebase analysis results are Priority 2 and assigned [MUST] (for 60%+ majority patterns) or [SHOULD].

Step 3: Installed Skills Analysis

Scan installed skills for framework-specific best practices.

3a. Skill detection:

1. Scan ~/.claude/skills/ (global skills)
2. Scan .claude/skills/ (project skills)
3. Read each SKILL.md frontmatter description and body

3b. Framework match: Compare detected project tech stack (from Steps 1-2) with skill keywords:

3c. User confirmation (if matching skills found):

Use AskUserQuestion:

question: "The following installed skills were detected. Use them for rule extraction?" / "以下のインストール済みスキルが検出されました。ルール抽出に使用しますか？"
header: "Skills"
multiSelect: true
options:
  - "{skill-name} — {description} (Recommended)" / "{skill-name} — {説明}"

3d. Priority mapping:

• Skill-derived rules are Priority 3 → [SHOULD] or [MAY]
• If a skill rule contradicts Priority 1 or 2 rules → keep higher priority, show warning
• Record source as Source: skill/{skill-name} in coding-rules.md

3e. No matching skills: If no matching skills are installed, optionally inform the user:

"Matching skills may be available on skills.sh for your tech stack.
Install and re-run to incorporate best practices."
/ "技術スタックに適合するスキルが skills.sh にある可能性があります。
インストール後に再実行すると、ベストプラクティスを取り込めます。"

Step 4: Interactive Dialogue

4a. Present extraction results:

Display detected rules summary by category:

Extraction Results:
  Testing Standards:    {n} rules
  Code Quality:         {n} rules
  Error Handling:       {n} rules
  Documentation:        {n} rules
  Security:             {n} rules
  Git:                  {n} rules
  Total:                {total} rules (Priority 1: {n}, Priority 2: {n}, Priority 3: {n})

If any category has 0 rules, highlight it for user attention.

4b. Output path selection (AskUserQuestion):

question: "Where to save coding-rules.md?" / "coding-rules.md の出力先は？"
header: "Output"
options:
  - "docs/coding-rules.md (Recommended)" / "docs/coding-rules.md（推奨）"
  - "docs/development/coding-rules.md"

If user selects "Other", accept any valid file path.

4c. Rule supplementation (AskUserQuestion):

For categories with missing or insufficient rules, ask targeted questions:

question: "Any additional testing rules?" / "テスト基準について追加ルールはありますか？"
header: "Testing"
options:
  - "Require 80%+ coverage (Recommended)" / "カバレッジ80%以上を必須にする"
  - "Specify E2E test patterns" / "E2Eテストパターンを指定する"
  - "No additions needed" / "追加不要"

question: "Commit message language?" / "コミットメッセージの言語は？"
header: "Git"
options:
  - "Japanese only" / "日本語のみ"
  - "English only" / "英語のみ"
  - "Conventional Commits (English)" / "Conventional Commits（英語）"

Suggest project-type-specific rules based on detected frameworks. Refer to the Project-Type Recommendations section in the reference template.

Step 5: Existing File Detection and Idempotency

If an existing coding-rules.md was found in Step 0:

1. Read the existing file
2. Compare with newly extracted rules (additions, changes, removals)
3. Use AskUserQuestion:

   question: "Existing coding-rules.md found. How to proceed?" / "既存の coding-rules.md が見つかりました。どうしますか？"
   header: "Existing File"
   options:
     - "Overwrite" / "上書きする"
     - "Merge differences" / "差分のみマージ"
     - "Cancel" / "キャンセル"
   

4. If "Cancel" → exit without changes

Step 6: Generate coding-rules.md

1. Load the appropriate reference template (based on Language Rules)
2. Fill in extracted rules by category
3. Apply severity tags: [MUST], [SHOULD], [MAY]
4. Add source attribution for each rule
5. Include the Sources summary table at the end
6. Create output directory if it does not exist
7. Write the file

Step 7: Update AGENTS.md / CLAUDE.md References

After generating coding-rules.md, append a reference to project convention files.

Procedure:

1. Check if AGENTS.md exists at project root

2. Check if CLAUDE.md exists (skip if it is a symlink to AGENTS.md)

3. Use AskUserQuestion:

   question: "Add reference to coding-rules.md in AGENTS.md / CLAUDE.md?" / "AGENTS.md / CLAUDE.md に coding-rules.md の参照を追記しますか？"
   header: "Update"
   options:
     - "Yes, add reference (Recommended)" / "はい、追記する（推奨）"
     - "No, skip" / "いいえ、スキップ"
   

4. If approved, append to the end of each file (or after an existing "Coding Rules" section):

   English version:

   ## Coding Rules
   
   Follow the coding rules in this file during implementation:
   - [{output_path}]({output_path}) — Quality rules generated by spec-rules-init
   

   Japanese version:

   ## コーディングルール
   
   実装時のコーディングルールは以下のファイルに従ってください:
   - [{output_path}]({output_path}) — spec-rules-init で生成された品質ルール集
   

5. If neither file exists → skip with a warning message:

   "Warning: No AGENTS.md or CLAUDE.md found. Skipping reference update."
   / "警告: AGENTS.md も CLAUDE.md も見つかりません。参照追記をスキップします。"
   

Step 8: spec-series Integration Notice

After completing generation, inform the user about integration with other spec-series skills:

"coding-rules.md has been generated. The following spec-series skills now reference it:
- spec-generator: Uses coding-rules.md as design constraints during the design phase
- spec-inspect: Checks [MUST] rules in Check 13 (Project Rule Compliance)
- spec-implement: Uses coding-rules.md as a quality gate during implementation"
/ "coding-rules.md を生成しました。以下の spec-series スキルが参照するようになっています:
- spec-generator: design フェーズで coding-rules.md を設計制約として使用
- spec-inspect: Check 13（プロジェクトルール準拠）で [MUST] ルールをチェック
- spec-implement: 実装時の品質ゲートとして coding-rules.md を使用"

Options

Error Handling

• Convention file unreadable: Warn and skip the file, continue with remaining files

  "Warning: Could not read {filename}. Skipping."
  / "警告: {filename} を読み取れません。スキップします。"
  

• Output directory does not exist: Create it automatically

  mkdir -p {output_directory}
  

• Write permission denied: Show error and suggest an alternative path

  "Error: Cannot write to {path}. Try a different location."
  / "エラー: {path} に書き込めません。別のパスを指定してください。"
  

• No convention files found: Fall back to dialogue-only mode

  "No convention files (CLAUDE.md, AGENTS.md, etc.) found. Proceeding with dialogue-only mode."
  / "規約ファイル（CLAUDE.md, AGENTS.md等）が見つかりません。対話のみモードで進みます。"
  

Usage Examples

# Generate coding rules from project conventions
"Generate coding rules"
「コーディングルールを生成して」

# Create coding-rules.md with forced overwrite
"Create coding-rules.md --force"
「coding-rules.md を作成 --force」

# Extract rules for a specific category
"Extract project rules --category testing"
「テストルールだけ抽出して」

# After generating, re-run to update
"Update coding-rules.md"
「coding-rules.md を更新して」

Post-Completion Actions

After generating coding-rules.md, suggest next actions with AskUserQuestion:

question: "coding-rules.md generated. What's next?" / "coding-rules.md を生成しました。次のアクションは？"
header: "Next"
options:
  - "Generate specifications (spec-generator)" / "仕様書を生成する（spec-generator）"
  - "Set up development workflow (spec-workflow-init)" / "開発ワークフローを設定する（spec-workflow-init）"
  - "Done for now" / "完了"