COG second brain
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.…
Install
npx skills add huytieu/COG-second-brainclaude mcp add cog-second-brain -- npx skills add huytieu/COG-second-brain{
"mcpServers": {
"cog-second-brain": {
"command": "npx",
"args": [
"skills",
"add",
"huytieu/COG-second-brain"
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →COG: The Agentic Second Brain That Actually Self-Evolves
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]
Quick Start
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.).
Agent Support Matrix
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.
Skills
Core Skills (Personal Knowledge)
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