Theo's solo projects outgrew his own understanding
Theo says his earlier solo projects stayed in his head, hiding what joining them would feel like. With agents producing code, he describes even his own solo projects as exceeding his comprehension. He now builds systems to keep both his agents and his own attention from getting lost.
Document solo projects for someone new to contribute
Treat the solo repository like a team project and write guidance for a stranger arriving to contribute. Provide steering files, runnable checks, and preview verification rather than relying entirely on what you remember. Periodically try a cold, minimal-context prompt to locate project knowledge that still lives only in your head.
Add guidance when solo code outpaces your memory
This is useful when agent-generated code in a small or solo project outpaces your personal recall. The missing context affects both your own return to the work and the agents joining it. If you can still hold the entire project in your head, do not treat Theo's self-description as proof otherwise.
Your solo project may still fit your memory
Theo's claim that his solo codebases exceed his comprehension describes his own experience, rather than a general measurement. The video does not establish that every solo developer has already reached the same limit. Use the onboarding discipline where your own project context has become tacit or difficult to recall.