# I built 270 AI agents in an Obsidian vault – zero API costs, all open source > Source: > Published: 2026-08-24 19:25:51+00:00 # 270 AI Agents, One Obsidian Vault, Zero API Costs I just built a complete AI agency infrastructure using only open-source tools, with zero monthly costs. ## What I Built 270 AI agent profiles across 17 divisions — engineering (58), specialized (57), marketing (36), game development (21), GIS (13), security (12), design (10), sales (9), testing (9), paid media (7), project management (7), academic (6), spatial computing (6), support (6), finance (5), product (5), healthcare (3). Each agent has full personality, workflows, deliverables, and success metrics. All interconnected through an Obsidian second brain — 317 notes with 500+ wikilinks. ## 11 Multi-Agent Playbooks 1. Launch a SaaS Product (14 agents) 2. Build an AI Feature (8 agents) 3. Security Audit and Harden (7 agents) 4. Content Marketing Engine (11 agents) 5. Growth Campaign Sprint (8 agents) 6. SEO Domination (7 agents) 7. Brand Identity Sprint (7 agents) 8. Company Formation (8 agents) 9. Hire a Team (6 agents) 10. Quarterly Review (7 agents) 11. Game Prototype (7 agents) ## Tech Stack (All Free) - Ollama with cloud-backed models - Playwright for browser automation - Docker (PostgreSQL + Redis) - ChatbotX — open-source ManyChat alternative - Text-to-CAD — 11 skills for manufacturing - Obsidian for the knowledge vault ## Get It The vault template (317 notes, 270 agents, 11 playbooks) is available on Gumroad: https://gumroad.com/products/gfaylx Install in 60 seconds. No API keys. No subscriptions. You own everything. Built with AI, for AI. The infrastructure is ready. The agents are deployed. The machine is running.