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COG Second Brain (Library) reference
A self-evolving second brain system combining AI agents with markdown files and version control. COG = Cognition + Obsidian + Git.
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COG Second Brain
A self-evolving second brain system combining AI agents with markdown files and version control. COG = Cognition + Obsidian + Git.
**Source:** COG Second Brain by Huy Tieu
Overview
COG Second Brain is a privacy-first, local-first knowledge management methodology that uses pure markdown files with Git version control. It provides a structured evolution cycle from daily capture through monthly knowledge consolidation, personalized through role packs.
Process Files
| Process | File | Description |
|---|---|---|
| Main Orchestrator | cog-orchestrator.js | Full lifecycle: setup, onboarding, daily/weekly/monthly cycles |
| Knowledge Capture | cog-knowledge-capture.js | Braindump, URL dump, meeting transcript processing |
| Intelligence Cycle | cog-intelligence-cycle.js | Daily brief, team brief, comprehensive analysis |
| Reflection & Synthesis | cog-reflection-synthesis.js | Weekly check-in, knowledge consolidation, monthly synthesis |
| Vault Management | cog-vault-management.js | Update COG, self-healing, cross-reference maintenance |
Agents
| Agent | Role |
|---|---|
| vault-architect | Vault structure design and maintenance |
| knowledge-curator | Content classification and curation |
| intelligence-analyst | News and source verification |
| team-synthesizer | Cross-platform integration |
| reflection-coach | Pattern analysis and reflection |
| framework-builder | Knowledge consolidation |
| meeting-analyst | Transcript processing |
| role-advisor | Role pack customization |
Skills
| Skill | Purpose |
|---|---|
| onboarding | Initial vault setup and role pack configuration |
| braindump-capture | Raw thought capture with domain classification |
| daily-intelligence | Personalized verified news briefs |
| url-extraction | URL insight extraction with credibility scoring |
| weekly-reflection | Cross-domain pattern analysis |
| knowledge-consolidation | Framework building from scattered notes |
| team-intelligence | Cross-platform team briefs |
| meeting-processing | Transcript to decisions and action items |
Vault Structure
cog-vault/
00-inbox/ # Profiles, interests, integrations
01-daily/ # Briefs & check-ins
02-personal/ # Private braindumps
03-professional/ # Professional notes & strategy
04-projects/ # Per-project tracking
05-knowledge/ # Consolidated frameworksEvolution Cycle
1. **Daily capture** - Braindump raw thoughts, classify by domain 2. **Daily intelligence** - Personalized verified news 3. **Daily team sync** - Cross-reference GitHub/Linear/Slack/PostHog 4. **Meeting processing** - Extract structured decisions/action items 5. **Weekly reflection** - Pattern analysis across domains 6. **Weekly deep-dive** - Comprehensive strategic analysis 7. **Monthly synthesis** - Scattered notes become consolidated frameworks
Role Packs
Product Manager, Engineering Lead, Engineer, Designer, Founder, Marketer, Custom
Key Principles
- No vendor lock-in (pure markdown + Git)
- Privacy-first, local-first
- 7-day freshness on intelligence sources
- 95%+ source accuracy
- Strict domain separation
- Self-healing cross-references
- Content-safe updates (framework separates from personal data)
Quick Start
# Initialize vault and onboard
babysitter run:create --process methodologies/cog-second-brain/cog-orchestrator \
--input '{"userName":"Alex","rolePack":"engineer","cycleMode":"setup"}'
# Daily cycle
babysitter run:create --process methodologies/cog-second-brain/cog-orchestrator \
--input '{"userName":"Alex","rolePack":"engineer","cycleMode":"daily"}'
# Weekly cycle
babysitter run:create --process methodologies/cog-second-brain/cog-orchestrator \
--input '{"userName":"Alex","rolePack":"engineer","cycleMode":"weekly"}'
# Full lifecycle
babysitter run:create --process methodologies/cog-second-brain/cog-orchestrator \
--input '{"userName":"Alex","rolePack":"engineer","cycleMode":"full"}'