# Closed Loop (agent skill)

> Closed Loop is an agent skill (a SKILL.md file) from huytieu/COG-second-brain. Run one task through the V-model verification loop: CP-2 plan → CP-3 build → CP-3v component verify → CP-4 integration verify (full lane) → CP-5… It works with Claude Code, Codex, Cursor and Gemini CLI and has 1,319 GitHub stars across a repository of 2 listed skills.

Run one task through the V-model verification loop: CP-2 plan → CP-3 build → CP-3v component verify → CP-4 integration verify (full lane) → CP-5 acceptance. The worker never grades its own homework; evidence rows trace back to AC-n. Opt-in: invoke with /closed-loop or by asking for the closed loop, proper verification, or an evidence trail. Ordinary work does not run this. Mechanical verification pipeline. Every verify step emits evidence rows tied to acceptance criterion IDs (AC-n).

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/huytieu/COG-second-brain |
| Skill path | skills/closed-loop/SKILL.md |
| Skill name | closed-loop |
| GitHub stars | 1,319 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 2 |
| Plugin marketplace | no |
| Official | no |
| Works with | Claude Code, Codex, Cursor, Gemini CLI |
| Category | Testing & QA |
| Last commit | Oct 23, 2026 |

## When it triggers

- invoke with /closed-loop or by asking for the closed loop, proper verification, or an evidence trail.

## Add this skill

### Claude Code

```sh
git clone --depth 1 https://github.com/huytieu/COG-second-brain.git
cp -r COG-second-brain/skills/closed-loop ~/.claude/skills/closed-loop   # personal, or .claude/skills in a project
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/huytieu/COG-second-brain.git
cp -r COG-second-brain/skills/closed-loop .agents/skills/closed-loop   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/huytieu/COG-second-brain.git
cp -r COG-second-brain/skills/closed-loop .cursor/skills/closed-loop   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/huytieu-closed-loop
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