Planner Agent

Blueprint is a CLI/TUI for developers who use multiple AI coding tools but need a stronger planning layer before execution. It opens as a terminal agent harness, onboards the project directory, provider CLIs, model pool, and reasoning settings, then runs an investigative planning chat with the user. When the scope is clear, Blueprint generates a technical blueprint under `.blueprint/`: architecture notes, assumptions, risks, a strict dependency graph, integration guidance, and isolated task files with XML prompts. Each task includes a precise `suggested_model`, allowed paths, validation commands, acceptance criteria, and context rules, so the user can hand it to Codex, Claude Code, Gemini CLI, or another worker without relying on chat memory. The core value is avoiding both overfitting and underfitting in AI-assisted development. Blueprint routes work by exact model, not just provider, using a local model registry with task fit, context, cost, latency, reasoning effort, and risk rules. The MVP does not execute workers; it is the planning and orchestration brain. A future supervisor mode can run the workers directly from the same interface.