Spec Gen En

Language: Always interact with the user in 日本語.

spec-gen-en

Actively discuss with the user to resolve unknowns, presenting reference ideas to solidify specifications.

Prerequisites

• Claude Code environment
• gh CLI (for GitHub Issue mode)

Arguments

• No arguments: Create a full set of design documents for a new project
• Path specified: Append/update to an existing specification document

Documents to Generate (Default Paths)

• These are default paths. If an existing spec directory is found, use that instead (see "Discovery" below)

Phase 1: Assess Current State and Decide Direction

1-0: Discover Existing Specs (Required — Run First)

If a path is specified as argument:

• Read the file/directory at that path directly
• Also check related files in the same directory

If no argument: Search for existing specs using Glob:

**/spec/**/*.md
**/specs/**/*.md
**/docs/**/*.md
**/specifications/**/*.md
**/design/**/*.md

Based on discovery results:

• Existing specs found: Record the directory structure and file paths as the base map. Place new documents within this structure. Do NOT use default paths
• No specs found: Use default paths (docs/ subtree)

Important: Always Read discovered spec files to understand current specifications before proceeding.

Output Destination

Confirm with AskUserQuestion:

• GitHub Issue + branch (recommended): Create the implementation Issue, then use its number for the work branch. The same Issue can be passed to impl at the end
• Local only: Work on current branch without creating Issues or branches

For New Projects

1. Interview about overview, purpose, and background
2. Present similar projects and tech stack direction
3. Agree on document scope
4. GitHub Issue mode: Record base branch -> create placeholder Issue -> create feat/#<issue-number> branch -> add branch name to Issue
   • Issue title must be feat: <feature-name> (the feature to implement). Never use document-centric titles like "Create design documents"
   • Body is a placeholder at this point (e.g., 仕様策定中（spec-gen 実行中）。完了後に実装内容を追記する。). Phase 3 rewrites it as the implementation Issue
   • Spec creation itself is the work of this skill, not a separate Issue. The goal here is to reserve an Issue number that will be reused as the impl target
5. Create tasks with TaskCreate

For Appending to Existing Specs

1. Using 1-0 discovery results, Read all existing spec files to understand current specifications
2. Interview about additions
3. Present existing feature reuse/change proposals
4. Agree on direction
5. GitHub Issue mode: Same as above (Issue title describes the feature to add; body is a placeholder)
6. Create tasks with TaskCreate

Phase 2: Document Creation Cycle (repeat per document)

2-1: Interview

• Gather information needed for the document in a single AskUserQuestion call
• Include pros/cons and reference ideas in option description fields

2-2: Write

• Create based on interview results. Use Mermaid for diagrams (see references/mermaid-guide.md)
• Include revision history (see format at end of references/mermaid-guide.md)

2-3: Review

• Present to user and confirm with AskUserQuestion (include "No issues" option)

2-4: Improvement Cycle

• If feedback -> revise -> update revision history -> re-confirm -> repeat until satisfied

2-5: Format & Lint

• Run if settings exist. Skip otherwise

2-6: Commit

• Commit following CLAUDE.md conventions

Phase 3: Finalize and Push

1. Confirm all documents are complete
2. Cross-document consistency check (ER vs API, components vs functional requirements, etc.)
3. GitHub Issue mode: Push -> rewrite the Issue body as the implementation Issue -> report summary (including Issue URL)
   • Replace the placeholder body of the Issue created in Phase 1 with the implementation Issue contents, following templates/impl-issue.md
   • Include: 概要 (overview), spec file links to consult during implementation, 受け入れ条件 (acceptance criteria), base branch
   • Acceptance criteria must be extracted from the spec docs as concrete completion conditions (avoid vague "implement it")
   • Write the new body to a temp file and apply with gh issue edit <number> --body-file <temp-file>, then delete the temp file
   • Keep the Issue open (do not close). It can be passed directly to /impl #<number>
4. Local mode: Report summary (file path list)

Rules

• Never guess unknowns; always confirm with user
• Always use AskUserQuestion with options for questions. Never ask via text alone
• Max 4 questions per round
• Include reference ideas in each option's description
• When appending to existing specs, prioritize reuse/modification of existing features
• Always add revision history when updating documents
• Track progress with TaskCreate/TaskUpdate
• If an existing spec directory is found, use those paths — not the defaults (docs/). Never create new subdirectories when existing ones already serve the same purpose
• When updating existing files, use Edit to modify them in place. Never create duplicate files in a different location