Agent skill

Closed Loop

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.

MITAuto-check passedProduct & Project Management

Install Closed Loop

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/closed-loop .claude/skills/closed-loop && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .claude/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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

$skill-installer install https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop

Type 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.

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/closed-loop .agents/skills/closed-loop && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .agents/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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.

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/closed-loop .cursor/skills/closed-loop && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .cursor/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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

$ gemini skills install https://github.com/huytieu/COG-second-brain.git --path skills/closed-loop

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/closed-loop .gemini/skills/closed-loop && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .gemini/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop

Installs 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).

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/closed-loop .github/skills/closed-loop && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .github/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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.

skills CLI

$ npx skills add huytieu/COG-second-brain --skill closed-loop -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install huytieu/COG-second-brain closed-loop --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/huytieu/COG-second-brain.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/closed-loop .opencode/skills/closed-loop && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "closed-loop" agent skill from https://github.com/huytieu/COG-second-brain/tree/main/skills/closed-loop into .opencode/skills/closed-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "closed-loop", 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: closed-loop
GitHub stars: 1.3k
Token cost: ~1.2k tokens
SKILL.md length: 441 words
Files: 3 (incl. references)
Skills in repo: 37
Repo updated: Oct 2, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

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.

Works in 8 steps: Lane + run folder → CP-1 Spec (acceptance criteria) → CP-2 Plan → …
Product & Project Management work in your project
SKILL.md covers When to use, Phase 0 — Lane + run folder, Phase 1 — CP-1 Spec… and Phase 2 — CP-2 Plan, plus 7 more sections
Calls bash

What it does

Closed Loop is an agent skill 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 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.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/spec-template.md`).

It sits in Product & Project Management. The repository describes itself as: Self-evolving second brain with 35 AI skills, 10 agents, and people CRM. Closed-loop harness: a V-model verification lifecycle where the worker never grades its own homework… The licence is MIT.

When your agent uses it

Product & Project Management work in your project

Example prompts

“/closed-loop”

Workflow steps

8 steps, taken from the step headings in SKILL.md.

Lane + run folder
CP-1 Spec (acceptance criteria)
CP-2 Plan
CP-3 Build
CP-3v Component verify
CP-4 Integration verify (full or multi-task)
CP-5 Acceptance (post-condition)
Record + handoff

What it can do on your machine

Read from SKILL.md and the folder at commit 36ac9d7. 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
Shell commands in SKILL.md call:
- bash
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

Closed Loop loads about 1.2k tokens when it runs, and up to ~2.8k if it reads all its reference files. Until then it costs about 97 tokens; SKILL.md has 441 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~97
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~2.8k

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 huytieu/COG-second-brain at commit 36ac9d7, republished under its MIT licence (© huytieu). 441 words, ~1,184 tokens.

Download SKILL.mdSave it as .claude/skills/closed-loop/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: closed-loop
description: 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.

Closed-loop execute (V-model right arm)

Mechanical verification pipeline. Every verify step emits evidence rows tied to acceptance criterion IDs (AC-n).

When to use

The harness is opt-in. Run it when:

Invoked as /closed-loop <task> or /closed-loop <spec-path>.
The user asks for the closed loop, proper verification, or an evidence trail.
verification_harness: on in 00-inbox/MY-PROFILE.md and this is a build task.
Another skill that declares a normal+ lane reaches its verify step.

Do not run it on a request that did not ask for it. Notes, briefs, research, drafts, and ordinary edits are not harness runs, and a checkpoint ledger on those is pure overhead.

Phase 0 — Lane + run folder

bash

bash .claude/lib/lane-classify.sh explain "<task>"
bash .claude/lib/checkpoint.sh init 04-projects/harness/runs/<YYYY-MM-DD-HHmm>

Lane	Checkpoints
`tiny`	CP-3 → CP-5 (if mutating)
`normal`	CP-1 → CP-2 → CP-3 → CP-3v → CP-5
`full`	+ CP-4 + claim-verifier + CP-6
`bug`	root-cause ledger (CP-0) before CP-3

Record: checkpoint.sh record <run-dir> CP-0 PASS|SKIP "<lane>"

Phase 1 — CP-1 Spec (acceptance criteria)

If spec exists, use its ## Acceptance criteria + traceability matrix. Else write:

04-projects/harness/runs/<id>/criteria.md using references/spec-template.md (criteria + matrix sections only).

Each criterion: falsifiable + AC-n ID + verify method.

Record: checkpoint.sh record <run-dir> CP-1 PASS "N criteria"

Phase 2 — CP-2 Plan

Map tasks → AC IDs in evidence/CP-2-plan.md. Update matrix status to pending.

Record: checkpoint.sh record <run-dir> CP-2 PASS

Phase 3 — CP-3 Build

Worker implements. Returns deliverable path only.

Phase 4 — CP-3v Component verify

retry=0
loop:
  spawn task-verifier (fresh context, read-only)
  merge EVIDENCE rows into evidence/ledger.md
  if PASS → break
  if FAIL:escalate → record CP-3v FAIL, escalate
  if FAIL:fixable && retry < 2 → fix-agent → retry++
  else → escalate

Copy verifier EVIDENCE rows into evidence/CP-3v-component.md.

Record: checkpoint.sh record <run-dir> CP-3v PASS|FAIL

Phase 5 — CP-4 Integration verify (`full` or multi-task)

Spawn integration-verifier (read-only). Append rows to ledger.

Skip for single-task normal.

Record: checkpoint.sh record <run-dir> CP-4 PASS|SKIP

Show full SKILL.md (190 more words)Show less

Phase 6 — CP-5 Acceptance (post-condition)

For each mutation, observe artifact (curl, screenshot, re-fetch). Emit:

EVIDENCE AC-n | CP-5 | PASS | <observation> | <artifact>

UI/UX flow changes: the post-condition is visual. Screenshot every meaningful state with whatever browser tooling the environment has, then read the image and confirm no overflow, misalignment, clipping, wrong color, or broken responsive layout before PASS. The Observation must describe what you saw; the artifact is the screenshot/GIF in evidence/. Fix any visual defect and re-capture. See CLAUDE.md → Visual Verification.

Write evidence/CP-5-acceptance.md. Traceability closure: every AC in matrix has ≥1 PASS row in ledger.

Record: checkpoint.sh record <run-dir> CP-5 PASS|FAIL

Phase 7 — Record + handoff

Append to .claude/logs/loop-ledger.tsv
Update spec traceability matrix statuses to verified
full lane / big task: generate an HTML rollup from references/report-template.html → 04-projects/harness/runs/<id>/report.html, filled from criteria.md + evidence/ledger.md (criteria, AC traceability, verifier verdicts, post-condition observations). Self-contained; SendUserFile it or publish as an Artifact. Skip for normal/tiny.
Suggest /retro <run-dir> for CP-7

Integration

Skill	Lane	CP-4
`ultragoal`	`full` per phase (never downgraded)	integration-verifier + north-star acceptance
`team-brief`	full	claim-verifier
`comprehensive-analysis`, `auto-research`	full	claim-verifier on cited claims
`content-factory`	normal	skip
`review-cockpit`	normal	skip; CP-6 is the user's approval per card

Escalation template

ESCALATED — <task>
Lane: <lane> | Last CP: <CP-n>
Evidence bundle: 04-projects/harness/runs/<id>/evidence/
Open AC IDs: <list without PASS rows>
Decision needed: <one question>

Files

SKILL.md and 2 other files (references) in skills/closed-loop of huytieu/COG-second-brain.

SKILL.md
references/report-template.html
references/spec-template.md

Open the folder on GitHubat commit 36ac9d7

Compare with similar skills

Closed Loop 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.

Closed Loop compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Closed Loop this skillhuytieu/COG-second-brain	1.3k	—	~1.2k	Automated safety check: Pass	MIT	5 days ago
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Game Changing FeaturesopenstatusHQ/data-table-filters	2.3k	3 repos	~2.1k	Automated safety check: Pass	MIT	5 days ago
CCPM Project Managementautomazeio/ccpm	8.4k	—	~1.1k	Automated safety check: Pass	MIT	6 mo ago
Convex Create Componentspokvulcan/poker-planning	114	8 repos	~2.6k	Automated safety check: Pass	MIT	3 days ago
Self Improving Agentfarm-fe/farm	5.6k	2 repos	~3.3k	Automated safety check: Notes	MIT	15 days ago

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Questions about Closed Loop

What does Closed Loop do?

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. Closed Loop is an agent skill 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 acceptance.

When should I use Closed Loop?

Closed Loop fits situations like: product & Project Management work in your project.

How do I install Closed Loop in Claude Code?

Run `npx skills add huytieu/COG-second-brain --skill closed-loop -a claude-code`. Or copy the skill folder (skills/closed-loop in huytieu/COG-second-brain) into .claude/skills/closed-loop in your project. Claude Code loads it when a task matches its description.

How do I install Closed Loop in Codex?

Run `npx skills add huytieu/COG-second-brain --skill closed-loop -a codex`. Or copy the skill folder (skills/closed-loop in huytieu/COG-second-brain) into .agents/skills/closed-loop in your project. Codex loads it when a task matches its description.

Can I use Closed Loop 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 huytieu/COG-second-brain --skill closed-loop -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/closed-loop, .gemini/skills/closed-loop, .github/skills/closed-loop and .opencode/skills/closed-loop in your project.

What does Closed Loop need to run?

Going by SKILL.md and its folder, Closed Loop needs the command-line tools its instructions call (bash).

Does Closed Loop 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 Closed Loop 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 Closed Loop use?

Closed Loop 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 Closed Loop use?

About 1.2k tokens (SKILL.md is roughly 4.7k 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 1.6k tokens, read only when the agent opens those files.

What are the alternatives to Closed Loop?

Skills that share tags, products or a category with Closed Loop: User Story Writer (deanpeters/Product-Manager-Skills, 7.2k stars), Game Changing Features (openstatusHQ/data-table-filters, 2.3k stars), CCPM Project Management (automazeio/ccpm, 8.4k stars) and Convex Create Component (spokvulcan/poker-planning, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Closed Loop?

huytieu (a GitHub user) maintains it in huytieu/COG-second-brain, which has 1,260 GitHub stars. The repository holds 37 skills in this directory. The repository was last updated on October 2, 2026.

Source: huytieu/COG-second-brain on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Closed Loop

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Closed-loop execute (V-model right arm)

When to use

Phase 0 — Lane + run folder

Phase 1 — CP-1 Spec (acceptance criteria)

Phase 2 — CP-2 Plan

Phase 3 — CP-3 Build

Phase 4 — CP-3v Component verify

Phase 5 — CP-4 Integration verify (full or multi-task)

Phase 6 — CP-5 Acceptance (post-condition)

Phase 7 — Record + handoff

Integration

Escalation template

Files

Compare with similar skills

Similar skills

More from huytieu/COG-second-brain

Related

Questions about Closed Loop

Phase 5 — CP-4 Integration verify (`full` or multi-task)