6 Practices that turned AI from prototyper to workhorse (106 PRs in 14 days)

1. Specs and plans are source code : Specs and plans live in git alongside source code, not in chat history. A new agent reads arch.md for the big picture, then its specific spec. You always know why something was built. 2. Three models review every phase : Claude, Gemini, and Codex catch almost entirely different bugs. No single model found more than 55% of issues. If you only review with the model that wrote the code, you're missing half the bugs. 20 bugs caught before shipping. Claude Code found 5 bugs, Gemini and Codex caught another 15, including a severe security issue Claude missed. 3. Enforce the process, don't suggest it . A state machine forces Spec → Plan → Implement → Review → PR. The AI can't skip steps. Tests must pass before advancing. AIs don't stick to the plan by themselves, you need rails. 4. Annotate, don't edit . Most of the work is writing specs and reviews that guide the code, not hacking at files in an open-ended chat. 5. Agents coordinate agents . An architect