Design Review
xwtro0tk1t-cloud/harness
Dispatch an independent challenger agent to adversarially review a spec or implementation plan against the actual codebase.
A skill your agent uses when implementing exactly one feature after its feature design review and implementation plan are confirmed.
Install Feature Implementation
$ npx skills add protect-my-hair/nucleus-marketplace --skill feature-implementation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace feature-implementation --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/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .claude/skills/feature-implementation && 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 "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .claude/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementationType 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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace feature-implementation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .agents/skills/feature-implementation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .agents/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace feature-implementation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .cursor/skills/feature-implementation && 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 "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .cursor/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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/protect-my-hair/nucleus-marketplace.git --path plugins/nucleus/skills/feature-implementation--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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace feature-implementation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .gemini/skills/feature-implementation && 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 "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .gemini/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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 protect-my-hair/nucleus-marketplace feature-implementationInstalls 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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .github/skills/feature-implementation && 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 "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .github/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install protect-my-hair/nucleus-marketplace feature-implementation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/nucleus/skills/feature-implementation .opencode/skills/feature-implementation && 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 "feature-implementation" agent skill from https://github.com/protect-my-hair/nucleus-marketplace/tree/main/plugins/nucleus/skills/feature-implementation into .opencode/skills/feature-implementation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "feature-implementation", 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
feature-implementation- GitHub stars
- 164
- Token cost
- ~562 tokens
- SKILL.md length
- 144 words
- Files
- 3 (incl. references)
- Skills in repo
- 18
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when implementing exactly one feature after its feature design review and implementation plan are confirmed.
- Implementing exactly one feature after its feature design review and implementation plan are confirmed
- SKILL.md covers 核心原则, 行为纪律 and 禁止
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Planning
What it does
Feature Implementation is an agent skill from protect-my-hair/nucleus-marketplace. Use when implementing exactly one feature after its feature design review and implementation plan are confirmed.
Its SKILL.md is about 560 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `agents/openai.yaml` and `references/implementation-boundary.md`).
It sits in Agent Workflows, covering Planning and Design review and critique. The repository describes itself as: Nucleus — Claude Code / Codex 工作流插件，确保 AI 编码产出结构可信、边界可审计、过程可追溯. The licence is MIT.
When your agent uses it
- Implementing exactly one feature after its feature design review and implementation plan are confirmed
- Tasks that involve Planning
- Tasks that involve Design review and critique
Example prompts
- “/feature-implementation”
What it can do on your machine
Read from SKILL.md and the folder at commit 3c82085. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
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
Feature Implementation loads about 562 tokens when it runs, and up to ~705 if it reads all its reference files. Until then it costs about 34 tokens; SKILL.md has 144 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 protect-my-hair/nucleus-marketplace at commit 3c82085, republished under its MIT licence (© protect-my-hair). 144 words, ~562 tokens.
Download SKILL.mdSave it as
.claude/skills/feature-implementation/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- feature-implementation
- description
- Use when implementing exactly one feature after its feature design review and implementation plan are confirmed.
Feature Implementation
核心原则
只实现当前特性实施计划覆盖的内容。
<HARD-GATE>
没有引用统一人工事实源的特性设计评审事实和实施计划确认事实，不得写源码、测试或正式文档。实施计划声明 uiDesign.applicability=required 时，未读取 UI 设计源、Pencil frame / UI 状态映射、公共组件 / 公共样式契约和视觉证据要求前，不得写 UI 相关源码或样式。
实施计划声明 uiDesign.applicability=candidate-found 时，未取得候选设计源是否相关的人工计划确认前，不得写 UI 相关源码或样式；确认相关后必须回到实施计划补齐 required 级 frame 映射和视觉证据。
实施计划缺少 developmentSpecs，或 developmentSpecs.status=missing 但没有人工计划明确接受 setup gap / 先补齐 docs/specs/** 的结论时，不得写源码、测试或样式。
实施计划缺少 specAnchor，或没有从磁盘重读 .nucleus/runs/<workflowRunId>/spec-anchor.json 及其 sourceEvidencePaths，或 specAnchor.status 不是 ready 且没有人工计划明确接受 gap 时，不得写源码、测试或样式。
</HARD-GATE>
行为纪律
- 先读取当前 featurePath、特性设计评审事实、实施计划确认事实、实施计划和测试计划；人工事实必须来自对话、PMS 状态或明确审批上下文，不能来自
summary.md、result.json、candidate 或 multi-review report。 - 每次进入实现、上下文压缩后恢复、切换 task、写源码前、写样式前、写 UI 前，都必须重读实施计划的
specAnchor、.nucleus/runs/<workflowRunId>/spec-anchor.json和其中sourceEvidencePaths；不得把对话摘要当成 specs 或 UI 设计事实。 - 写任何源码、测试或样式前，先执行 pre-edit gate：确认当前 task 的 planned files、适用 rule id、acceptance、evidence 和 verify command；缺任一项时回到实施计划评审。
- 读取实施计划的
developmentSpecs和.nucleus/runs/<workflowRunId>/development-specs-evidence.json；存在docs/specs/rules/**时，先读适用规则再改代码；缺失时，先补齐规范或取得人工计划豁免。 - 只修改实施计划声明的代码区域、测试区域和文档区域。
- 代码、测试和文档改动必须能回指当前 featurePath。
- 写 UI 前必须读取实施计划的
uiDesign、.nucleus/runs/<workflowRunId>/ui-design-evidence.json、对应 Pencil frame / 用户设计稿、相邻页面、公共组件、公共 CSS / token 或页面级样式；candidate-found必须先取得人工相关性结论；没有设计源时，也必须按现有公共组件和既有样式实现。 - UI 实现后必须产出计划声明的截图、Pencil frame 对照、人工视觉证据或等价报告；缺证据时不得声称完成。
- 开发完成前必须执行 completion gate：按 changed files 重新计算 applicable rules -> evidence coverage；缺 blocking rule 证据、UI frame 未覆盖或 factsManifestHash stale 时不得触发完成评审。
- 发现计划不成立、依赖缺失或 scope 变化时停住，回到计划或设计评审节点。
- 开发完成后必须触发
multi-review，覆盖 code-review、方案一致性和计划满足度。
禁止
- 顺手做无关重构。
- 合并多个特性的实现。
- 在计划外写接口、数据结构、权限或外部依赖。
- 忽略
docs/specs/**规范事实源，或把规范缺失当作无约束。 - 依赖压缩后的对话摘要继续实现，而不重读
specAnchor.sourceEvidencePaths。 - 使用未确认存在的 CSS 类、跳过公共页面布局 / 组件模式，或在有 Pencil 设计源时只按个人判断重画界面。
- 用测试通过替代设计一致性和计划满足度评审。
- 创建、批准、合入或发布 MR/PR。
© protect-my-hair, 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 (references) in plugins/nucleus/skills/feature-implementation of protect-my-hair/nucleus-marketplace.
- SKILL.md
- agents/openai.yaml
- references/implementation-boundary.md
Open the folder on GitHubat commit 3c82085
Compare with similar skills
Feature Implementation 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 |
|---|---|---|---|---|---|---|
| Feature Implementation this skillprotect-my-hair/nucleus-marketplace | 164 | — | ~562 | Automated safety check: Pass | MIT | |
| Design Reviewxwtro0tk1t-cloud/harness | 265 | — | ~1.6k | Automated safety check: Pass | None | |
| Cross Agent Planprassanna-ravishankar/repowire | 264 | — | ~272 | Automated safety check: Pass | None | |
| Plan Design Reviewgarrytan/gstack | 136k | — | ~21k | Automated safety check: Warn | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Interview Meaddyosmani/agent-skills | 105k | 6 repos | ~3.8k | Automated safety check: Pass | MIT |
Similar skills
Cross Agent Plan
prassanna-ravishankar/repowire
Request an independent implementation plan or design critique from a local coding agent through Repowire remote MCP.
Plan Design Review
garrytan/gstack
Designer's eye plan review — interactive, like CEO and Eng review.
Executing Plans Inline
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
Interview Me
addyosmani/agent-skills
Asks one question at a time, each with a best guess attached, until the agent is about 95 percent sure what you really want, before any plan, spec or code.
OpenSpec Guided Onboarding
Fission-AI/OpenSpec
Walks you through a complete OpenSpec workflow cycle with narration while doing real work in your codebase.
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Collects, freezes and validates a Nucleus V2 session binding report that records the native Claude Code or Codex session ID, transcript path and hash.
Nucleus Result Package Builder
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Builds the result.json file for a Nucleus V2 workflow run from its context, gates, blockers and step status, and exits non-zero when the run is blocked.
Defect Intake and RCA Candidates
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Checks whether a defect report has enough context to be accepted, then drafts candidate-only root-cause evidence for human review without confirming causes or changing code.
Nucleus Delivery Evidence Finalizer
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Combines the evidence from completed Nucleus workflow steps into a final evidence report and result package, without scheduling steps, updating trackers or opening pull requests.
Related
Categories
Questions about Feature Implementation
What does Feature Implementation do?
A skill your agent uses when implementing exactly one feature after its feature design review and implementation plan are confirmed. Feature Implementation is an agent skill from protect-my-hair/nucleus-marketplace. Use when implementing exactly one feature after its feature design review and implementation plan are confirmed.
When should I use Feature Implementation?
Feature Implementation fits situations like: implementing exactly one feature after its feature design review and implementation plan are confirmed; tasks that involve Planning; tasks that involve Design review and critique.
How do I install Feature Implementation in Claude Code?
Run `npx skills add protect-my-hair/nucleus-marketplace --skill feature-implementation -a claude-code`. Or copy the skill folder (plugins/nucleus/skills/feature-implementation in protect-my-hair/nucleus-marketplace) into .claude/skills/feature-implementation in your project. Claude Code loads it when a task matches its description.
How do I install Feature Implementation in Codex?
Run `npx skills add protect-my-hair/nucleus-marketplace --skill feature-implementation -a codex`. Or copy the skill folder (plugins/nucleus/skills/feature-implementation in protect-my-hair/nucleus-marketplace) into .agents/skills/feature-implementation in your project. Codex loads it when a task matches its description.
Can I use Feature Implementation 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 protect-my-hair/nucleus-marketplace --skill feature-implementation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/feature-implementation, .gemini/skills/feature-implementation, .github/skills/feature-implementation and .opencode/skills/feature-implementation in your project.
What does Feature Implementation need to run?
SKILL.md names no scripts, command-line tools or credentials: Feature Implementation is instructions for the agent only.
Does Feature Implementation 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 Feature Implementation 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 Feature Implementation use?
Feature Implementation 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 Feature Implementation use?
About 562 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 143 tokens, read only when the agent opens those files.
What are the alternatives to Feature Implementation?
Skills that share tags, products or a category with Feature Implementation: Design Review (xwtro0tk1t-cloud/harness, 265 stars), Cross Agent Plan (prassanna-ravishankar/repowire, 264 stars), Plan Design Review (garrytan/gstack, 136k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Feature Implementation?
protect-my-hair (a GitHub user) maintains it in protect-my-hair/nucleus-marketplace, which has 164 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on July 23, 2026.
Source: protect-my-hair/nucleus-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.