CCPM Project Management
automazeio/ccpm
Runs a spec-driven workflow from PRD to epic to GitHub issues to parallel agents, with status, standup and blocked-work reports from bundled scripts.
機能設計書を作成するための詳細ガイドとテンプレート。機能設計書作成時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8.
Install Functional Design
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-design --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/functional-design .claude/skills/functional-design && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .claude/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-designType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/functional-design .agents/skills/functional-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .agents/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/functional-design .cursor/skills/functional-design && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .cursor/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/GenerativeAgents/claude-code-book-chapter8.git --path .claude/skills/functional-design--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/functional-design .gemini/skills/functional-design && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .gemini/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-designInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/functional-design .github/skills/functional-design && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .github/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install GenerativeAgents/claude-code-book-chapter8 functional-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GenerativeAgents/claude-code-book-chapter8.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/functional-design .opencode/skills/functional-design && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "functional-design" agent skill from https://github.com/GenerativeAgents/claude-code-book-chapter8/tree/main/.claude/skills/functional-design into .opencode/skills/functional-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "functional-design", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
functional-design- GitHub stars
- 119
- Token cost
- ~214 tokens
- SKILL.md length
- 39 words
- Files
- 3
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- MIT
At a glance
機能設計書を作成するための詳細ガイドとテンプレート。機能設計書作成時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8.
- Works in 2 steps: 既存の機能設計書 (docs/functional-design.md) - 最優先 → このスキルのガイド - 参考資料
- Tasks that involve PRD writing
- SKILL.md covers 前提条件, 既存ドキュメントの優先順位, 出力先 and テンプレートの参照, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Functional Design is an agent skill from GenerativeAgents/claude-code-book-chapter8. 機能設計書を作成するための詳細ガイドとテンプレート。機能設計書作成時にのみ使用。
Its SKILL.md is about 210 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `guide.md` and `template.md`).
It sits in Product & Project Management, covering PRD writing. The licence is MIT.
When your agent uses it
- Tasks that involve PRD writing
Example prompts
- “/functional-design”
Requirements
- Pre-approved tools (allowed-tools): Read, Write
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- 既存の機能設計書 (docs/functional-design.md) - 最優先
- このスキルのガイド - 参考資料
What it can do on your machine
Read from SKILL.md and the folder at commit 27c4191. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWrite
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Functional Design loads about 214 tokens when it runs. Until then it costs about 15 tokens; SKILL.md has 39 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from GenerativeAgents/claude-code-book-chapter8 at commit 27c4191, republished under its MIT licence (© GenerativeAgents). 39 words, ~214 tokens.
Download SKILL.mdSave it as
.claude/skills/functional-design/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- functional-design
- description
- 機能設計書を作成するための詳細ガイドとテンプレート。機能設計書作成時にのみ使用。
- allowed-tools
- Read, Write
機能設計書作成スキル
このスキルは、高品質な機能設計書を作成するための詳細ガイドです。
前提条件
機能設計書作成を開始する前に、以下を確認してください:
docs/product-requirements.md が作成されている
必須: PRDが以下の場所に存在する必要があります:
ファイルパス: docs/product-requirements.md
機能設計書は、PRDで定義された要件を技術的に実現する方法を詳細化します。
既存ドキュメントの優先順位
重要: docs/functional-design.md に既存の機能設計書がある場合、
以下の優先順位に従ってください:
既存の機能設計書 (
docs/functional-design.md) - 最優先- プロジェクト固有の設計が記載されている
- このスキルのガイドより優先する
このスキルのガイド - 参考資料
- 汎用的なテンプレートと例
- 既存設計書がない場合、または補足として使用
新規作成時: このスキルのテンプレートとガイドを参照 更新時: 既存設計書の構造と内容を維持しながら更新
出力先
作成した機能設計書は以下に保存してください:
docs/functional-design.mdテンプレートの参照
機能設計書を作成する際は、次のテンプレートを使用してください: ./template.md
詳細ガイド
さらに詳しい作成ガイドは次のファイルを参照してください: ./guide.md
© GenerativeAgents, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files in .claude/skills/functional-design of GenerativeAgents/claude-code-book-chapter8.
- SKILL.md
- guide.md
- template.md
Open the folder on GitHubat commit 27c4191
Compare with similar skills
Functional Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Functional Design this skillGenerativeAgents/claude-code-book-chapter8 | 119 | — | ~214 | Automated safety check: Pass | MIT | |
| CCPM Project Managementautomazeio/ccpm | 8.4k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Ralph Tui Create Beadssubsy/ralph-tui | 2.5k | 1 repos | ~2.6k | Automated safety check: Pass | MIT | |
| Trellis Brainstormanjiemo/SunnyBeach | 178 | 7 repos | ~4k | Automated safety check: Pass | Apache-2.0 | |
| Adversarial Speczscole/adversarial-spec | 556 | 1 repos | ~8.3k | Automated safety check: Notes | MIT | |
| Ralph Tui Create Beads Rustsubsy/ralph-tui | 2.5k | 1 repos | ~2.8k | Automated safety check: Pass | MIT |
Similar skills
Ralph Tui Create Beads
subsy/ralph-tui
Convert PRDs to beads for ralph-tui execution. An agent skill from subsy/ralph-tui.
Trellis Brainstorm
anjiemo/SunnyBeach
Guides collaborative requirements discovery before implementation.
Adversarial Spec
zscole/adversarial-spec
Iteratively refine a product spec by debating with multiple LLMs (GPT, Gemini, Grok, etc.) until all models agree.
Ralph Tui Create Beads Rust
subsy/ralph-tui
Convert PRDs to beads for ralph-tui execution using beads-rust (br CLI).
To Issues
ywwynm/EverythingDone
Break a plan, spec, or PRD into independently-grabbable issues on the project issue tracker using tracer-bullet vertical slices.
More from GenerativeAgents/claude-code-book-chapter8
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GenerativeAgents/claude-code-book-chapter8
チーム全体で統一された開発プロセスとコーディング規約を確立するための包括的なガイドとテンプレート。開発ガイドライン作成時、コード実装時に使用する。
Prd Writing
GenerativeAgents/claude-code-book-chapter8
プロダクト要求定義書(PRD)を作成するための詳細ガイドとテンプレート。PRD作成時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8.
Steering
GenerativeAgents/claude-code-book-chapter8
作業指示毎の作業計画、タスクリストをドキュメントに記録するためのスキル。ユーザーからの指示をトリガーとした作業計画時、実装時、検証時に読み込む。
Architecture Design
GenerativeAgents/claude-code-book-chapter8
アーキテクチャ設計書を作成するための詳細ガイドとテンプレート。アーキテクチャ設計時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8.
Repository Structure
GenerativeAgents/claude-code-book-chapter8
リポジトリ構造定義書を作成するための詳細ガイドとテンプレート。リポジトリ構造定義時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8.
Glossary Creation
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用語集を作成するための詳細ガイドとテンプレート。用語集作成時にのみ使用。
Related
Categories
Questions about Functional Design
What does Functional Design do?
機能設計書を作成するための詳細ガイドとテンプレート。機能設計書作成時にのみ使用. An agent skill from GenerativeAgents/claude-code-book-chapter8. Functional Design is an agent skill from GenerativeAgents/claude-code-book-chapter8.
When should I use Functional Design?
Functional Design fits situations like: tasks that involve PRD writing.
How do I install Functional Design in Claude Code?
Run `npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a claude-code`. Or copy the skill folder (.claude/skills/functional-design in GenerativeAgents/claude-code-book-chapter8) into .claude/skills/functional-design in your project. Claude Code loads it when a task matches its description.
How do I install Functional Design in Codex?
Run `npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a codex`. Or copy the skill folder (.claude/skills/functional-design in GenerativeAgents/claude-code-book-chapter8) into .agents/skills/functional-design in your project. Codex loads it when a task matches its description.
Can I use Functional Design in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add GenerativeAgents/claude-code-book-chapter8 --skill functional-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/functional-design, .gemini/skills/functional-design, .github/skills/functional-design and .opencode/skills/functional-design in your project.
What does Functional Design need to run?
SKILL.md names no scripts, command-line tools or credentials: Functional Design is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write.
Does Functional Design access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Functional Design safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Functional Design use?
Functional Design is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Functional Design use?
About 214 tokens (SKILL.md is roughly 856 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Functional Design?
Skills that share tags, products or a category with Functional Design: CCPM Project Management (automazeio/ccpm, 8.4k stars), Ralph Tui Create Beads (subsy/ralph-tui, 2.5k stars), Trellis Brainstorm (anjiemo/SunnyBeach, 178 stars) and Adversarial Spec (zscole/adversarial-spec, 556 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Functional Design?
GenerativeAgents (a GitHub organization) maintains it in GenerativeAgents/claude-code-book-chapter8, which has 119 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on February 28, 2026.
Source: GenerativeAgents/claude-code-book-chapter8 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.