by huytieu
Self-evolving second brain with 33 AI skills, 10 agents, and people CRM. Closed-loop harness: a V-model verification lifecycle where the worker never grades its own homework. Plus paired anti-slop design skills for marketing and product UI. Works with Claude Code, Cursor, Kiro, Gemini CLI, Codex.
# Add to your Claude Code skills
git clone https://github.com/huytieu/COG-second-brainGuides for using ai agents skills like COG-second-brain.
Last scanned: 5/20/2026
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"status": "PASSED",
"scannedAt": "2026-05-20T07:43:49.836Z",
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"npmAuditRan": true,
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}COG-second-brain is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by huytieu. Self-evolving second brain with 33 AI skills, 10 agents, and people CRM. Closed-loop harness: a V-model verification lifecycle where the worker never grades its own homework. Plus paired anti-slop design skills for marketing and product UI. Works with Claude Code, Cursor, Kiro, Gemini CLI, Codex. It has 1,145 GitHub stars.
Yes. COG-second-brain passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/huytieu/COG-second-brain" and add it to your Claude Code skills directory (see the Installation section above).
COG-second-brain is primarily written in HTML. It is open-source under huytieu on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh COG-second-brain against similar tools.
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⚠️ Third-Party Software Notice
This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.
Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.
Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.
Cognition + Obsidian + Git — A self-evolving second brain powered by AI agents, markdown files, and version control. No database, no vendor lock-in — just .md files that think.
Quick Start | Skills | Features | FAQ | SETUP.md
Works with Claude Code • Antigravity • Cursor • Kiro • Gemini CLI • OpenAI Codex • any AI that reads markdown
Inspired by Garry Tan's gstack and gbrain
graph LR
A[You] -- natural language --> B[AI Agent]
B -- runs --> C[33 Skills]
C -- delegates to --> W[6 Workers]
C -- verified by --> V[4 Read-Only Verifiers]
C -- reads & writes --> D[.md Files]
W -- reads & writes --> D
V -- observes --> D
C -- syncs with --> G[GitHub / Linear / Slack / PostHog]
D --> E[Git]
D --> F[iCloud]
1. Clone & enter the repo:
git clone https://github.com/huytieu/COG-second-brain.git
cd COG-second-brain
2. Run onboarding in your agent:
| Agent | Command | How it finds skills |
|---|---|---|
| Claude Code | code . → "Run onboarding" |
.claude/skills/ |
| Antigravity | Open folder → "Run onboarding" | .agents/skills/ + .agents/rules/cog.md |
| Cursor | Open folder → "Run onboarding" | .cursor-plugin/ + .cursorrules |
| Kiro | Open folder → "setup COG" | .kiro/powers/ |
| Gemini CLI | gemini → /onboarding |
GEMINI.md + .gemini/commands/ |
| OpenAI Codex | codex → "Run onboarding" |
AGENTS.md |
| Other agents | Point at AGENTS.md → "Run onboarding" |
AGENTS.md |
Or install via skills.sh:
npx skills add huytieu/COG-second-brain
Done — COG is personalized and ready in ~2 minutes. See SETUP.md for optional config (Git sync, iCloud, Obsidian Tasks, etc.).
COG ships a full Claude Code surface, a full Antigravity surface, plus core native surfaces for Kiro and Gemini CLI, with AGENTS.md as the universal fallback for Codex and other markdown-reading agents.
| Surface | Current support | Notes |
|---|---|---|
| Claude Code | 33 native skills + 10 agents (6 workers + 4 verifiers) | Full first-class surface |
| Antigravity | 33 skills + 10 agents (pointer-stub format) | Full surface — thin stubs in .agents/ delegate to the .claude/ playbooks, which stay authoritative |
| Agent Plugins standard | Root plugin.json + skills/ (33 skills) |
Spec 1.0.0 conformant; any standard-aware client loads COG as a plugin |
| Cursor | Plugin manifest + rules | .cursor-plugin/plugin.json + .cursorrules |
| Kiro | 7 native powers | Core workflows today |
| Gemini CLI | 7 native commands | Core workflows today |
AGENTS.md |
33 documented commands | Universal fallback for Codex and other agents |
Before publishing or updating framework files, run ./scripts/validate-agent-surface.sh to catch drift between manifests, docs, and shipped files. See docs/AGENT-SUPPORT.md for the detailed support matrix and contributor rules.
| Skill | What it does | Try saying... |
|---|---|---|
| onboarding | Personalize COG for your workflow (run first!) | "Run onboarding" |
| braindump | Capture raw thoughts with intelligent classification | "I need to braindump" |
| daily-brief | Verified news intelligence (7-day freshness) | "Give me my daily brief" |
| url-dump | Save URLs with auto-extracted insights | "Save this URL" |
| weekly-checkin | Cross-domain pattern analysis | "Weekly review" |
| knowledge-consolidation | Build frameworks from scattered notes | "Consolidate my knowledge" |
| update-cog | Update framework files without touching your content | "Update COG" |
| memory-hygiene | Trust sweep of persistent memory — re-verify claims against the live environment, stamp last_verified + confidence |
"Audit my memories" |
| Skill | What it does | Try saying... |
|---|---|---|
| team-brief | Cross-reference GitHub + Linear + Slack + PostHog into a daily team intelligence brief with two-way Linear sync-back | "Team brief" / "What did we ship?" |
| meeting-transcript | Process meeting recordings into structured decisions, action items, and team dynamics | "Process this meeting" |
| comprehensive-analysis | Deep 7-day analysis for weekly reviews, board prep, or strategic planning (~8-12 min) | "Weekly analysis" / "Board prep" |
| Skill | What it does | Try saying... |
|---|---|---|
| create-user-story | Create user stories with duplicate checking across Linear, GitHub Issues, or Jira | "Create a user story for..." |
| generate-prd | Draft PRDs with approval gate before publishing to Confluence/Notion | "Generate a PRD for..." |
| generate-release-notes | Generate release notes from GitHub milestones, Linear cycles, or manual input | "Generate release notes for v2.1" |
| export-open-issues | Audit and export open issues from any tracker into a structured vault summary | "Export open issues" |
| publish-to-confluence | Publish any vault markdown file to Confluence | "Publish this to Confluence" |
| update-knowledge-base | Maintain product knowledge base from releases, features, and project changes | "Update the knowledge base with v2.1 changes" |
PM Workflow: These skills form a complete product management lifecycle: Research (
/auto-research) → PRD (/generate-prd) → Stories (/create-user-story) → Development → Release Notes (/generate-release-notes) → Knowledge Base (/update-knowledge-base). Use/export-open-issuesfor audits and/publish-to-confluenceto share externally.
| Skill | What it does | Try saying... |
|---|---|---|
| auto-research | Deep strategic research engine — decomposes questions into parallel research threads with multiple agents | "Research the future of AI testing tools" |
| Skill | What it does | Try saying... |
|---|---|---|
| content-factory | Autonomous content pipeline — scout announcements, triage by trend momentum + your unique angle, publish with ledger dedup, hard volume caps, and screenshot-verified posting | "Run the content factory" |
Opt-in. Ask for one of these and work walks a V: decompose left into falsifiable criteria, build at the apex, verify right with evidence traced back to each criterion. Say nothing and none of it runs: ordinary work carries no checkpoints and no evidence ledger. Turn it on per request, or by default for build tasks with verification_harness: on in 00-inbox/MY-PROFILE.md. Full lifecycle in WORKFLOW.md.
| Skill | What it does | Try saying... |
|---|---|---|
| closed-loop | Plan → build → component verify → integration verify → acceptance. The worker never grades its own homework; verifiers observe the artifact, not the worker's summary | "Run this through the closed loop" |
| ultragoal | A goal too big for one session, run as a chain of phases with cross-session state and a north-star acceptance gate | "Track this as an ultragoal" |
| harvest | Capture session learnings, stage them for approval, propose skill patches. Never writes durable knowledge unapproved | "Harvest what we learned" |
| retro | Audit the run's checkpoints and evidence quality. A run can pass every gate on weak observations | "Retro this run" |
| review-cockpit | One living doc per multi-item session: progress, per-item cards, and an approval slot you edit in place | "Set up a review cockpit" |
| Skill | What it does | Try saying... |
|---|---|---|
| no-ai-slop | Sharpen a draft without flattening its voice, or just detect AI-slop patterns | "Make this less AI-sounding" |
| editorial-illustrations | Claim → geometry: derive the right figure from what the text argues, render it as self-contained theme-aware HTML/SVG | "Make a diagram for this argument" |
| data-forms | 20+ chart and diagram forms with when-to-use, failure modes, and the encoding discipline that makes any of them readable | "The bar chart is burying the point" |
| museum-art | Real public-domain artwork from museum open-access APIs instead of AI-generated or stock imagery | "Find a hero image for this post" |
| daily-journal | A passive work journal the agent keeps for you, plus a guided reflection on request | "Reflect on today" |
A paired set. taste-skill owns first-impression surfaces, product-ui-taste owns surfaces people use every day. Never run both on the same component.
| Skill | Owns | Try saying... |
|---|---|---|
| taste-skill | Landing pages, portfolios, marketing, editorial. States a "Design Read" before writing code so it stops defaulting to one house aesthetic | "Build a landing page for this" |
| product-ui-taste | Dashboards, data tables, forms, wizards, settings, admin consoles. Budgets the frame in px first, then survives real data: overflow, long labels, empty/error/permission-denied states | "Build the admin table for this" |
COG uses a worker agent architecture inspired by garrytan/gstack specialist sessions and garrytan/gbrain knowledge patterns. Workers handle data-heavy tasks cheaply (Sonnet) while the lead session does reasoning (Opus).
| Agent | What i