Learn how to build agentic harnesses to achieve Fable 5 level AI results with any model, ensuring autonomy despite model shutdowns.
Key Takeaways
- The power of AI depends as much on the harness as on the model itself.
- Building your own harness ensures autonomy and resilience against AI service shutdowns.
- Agentic harnesses enable long-term, autonomous, creative AI workflows.
- Frontier models are best for building harnesses; open source models are ideal for economical execution.
- Owning the harness gives you leverage and control over your AI workflows.
Summary
- Fable 5 was a powerful AI model that got pulled, but its success was due to the agentic harness (Cloud Code) it used.
- An agentic harness acts as the body and tools for an AI model, enabling long horizon autonomous creative work.
- Harnesses can be built to work with any model, including GPT, Gemini, Opus, and open source models.
- Owning the harness (rig) rather than renting the model intelligence protects against disruptions like government shutdowns.
- The AI agent loop involves reading prompts, selecting tools, running them, verifying results, and iterating until done.
- Building your own harness allows you to plug in frontier models for quality and open source models for cost efficiency.
- The harness includes context (knowledge base), tools, verification systems, memory, and decision logic.
- Using frontier models to build harnesses and open source models to run them balances cost, privacy, and performance.
- The video demonstrates building a harness for a directory project, showing practical steps and workflows.
- The creator encourages viewers to build sovereign AI systems to avoid dependence on any single AI provider.
Chapters
- 00:00Introduction to Fable 5 and agentic harnesses
- 01:22Fable 5's directory project and its capabilities
- 02:45Components of an agentic harness
- 03:57Owning the harness vs renting AI intelligence
- 05:07Importance of harnesses for AI resilience
- 06:16Using frontier models to build and open source to run
- 07:41Demonstration of harness capabilities and workflows
- 10:32Building your own harness step-by-step
- 12:22Harness management, content production, and project integration
- 14:40Final thoughts on sovereign AI and harness ownership











