Solo Builder Product OS

Operating model for a solo founder building with AI agents: phase gates, evidence classes and maturity states, with templates and a validator.

Problem

Building alone with agents produces a lot of output fast, and it is easy to move to the next phase on a hunch instead of on evidence.

Value

A builder knows at each phase what evidence is enough to move on, and the next step is decided by a rule instead of a mood.

Role

Author of the model, the templates and the agent prompts. Defined the active-cycle schema and its validator.

  • Classified every claim by the evidence behind it and tied each phase gate to the evidence it needs.
  • Wrote the templates for the foundation audit, the phase gate, the product core, the active bet and the evidence ledger.
  • Wrote an agent prompt for each phase and a daily router that picks the phase to work in.
  • Defined the active-cycle file as a schema with a validator, so the state of a product is checked, not assumed.

Limits

  • A written model with templates and a validator, not an application.

Sources

  • Operating model, templates and agent prompts, version 2
  • Private package, finished in August 2026