Three-Body Agent: the Playbook
Blueprints for autonomous frontier LLM pipelines that carry a GitHub issue to a merged pull request, with no human in the loop.
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What's inside
- Why three bodies
- The Implementer
- Adversarial self-review
- External reviewer
- The Fixer
- The Merger
- The code nobody read
- GitHub Projects and board sync
- Cron jobs vs webhooks
- The local-LLM variant
- Failures and pitfalls
- Cost dashboards and the kill switch
- Run it
- Closing
Look inside
What you get
The full architecture, not a sketch. Fourteen chapters, around forty A5 pages, the same autonomous pipeline I run against my own iOS apps. It starts from one principle, that one bad inference in one role cannot be allowed to take the loop down, and builds out from there: the three bodies (Implementer, Fixer, Merger), the adversarial self-review, the external reviewer, the GitHub Projects board, the cron-versus-webhook triggers, the local-LLM variant, the failure catalogue, and the cost dashboards that tell you when to pull the kill switch.
Every role chapter carries the verbatim prompt that governs it. The repository at github.com/a7t-ai/three-body-agent is the runnable source; this book is the why behind it, the architecture written down so you can fork it and reshape it for your own team.
Who it is for
- Senior engineers deciding whether an autonomous-agent track is worth a real bet.
- AI engineers who want an opinionated reference architecture, not a tutorial.
- CTOs weighing what it means to merge code no human reviewed.
If you want a twenty-minute overview first, the free 7 prompts behind Three-Body Agent one-pager is the index to this manual. Get it here.
About the author
I am Leonardo Cardoso. I build autonomous AI systems and ship iOS apps on my own. The Three-Body Agent began as the pipeline that delegated the engineering of IGNIO, a SaaS I ran single-handed; it outlived that product and now ships features to my apps while I work on other things. This book is that architecture, written down without the hype.
FAQ
Is the code included? The architecture and the verbatim role prompts are in the book. The complete, runnable source, every workflow and YAML file, is the public repository the book points to. The book is the reasoning; the repository is the implementation.
Refund policy? 14-day no-questions refund, handled by Polar. EU rights apply.
Free updates? Yes. Buyers get every future edition of this title, by email, for life.
Which language? This edition is in English. The role names, prompts, and code are English in any case.
Edition? v0.1. An early edition; it will be revised, and every revision reaches you free.
14-day no-questions refund.