Claude Code has a to-do list. Codex has a to-do list. Gemini has a to-do list. None of them have a planner. PlanDB replaces flat checklists with a compound dependency graph. Your agents decompose tasks, parallelize independent work, adapt plans mid-flight, and persist knowledge across sessions. The result: 10x more complex projects completed autonomously. One agent built a 3,769-line GPT-2 in Rust - 20 tasks, 7 experiments, zero human intervention. Open source · Rust · SQLite · Zero config