GSD Pi is a local-first coding agent for planning, implementing, verifying, and tracking project work from the command line. It combines a terminal agent, project workflow tools, worktree-aware Git automation, local project memory, model routing, and optional UI integrations so a project can move from idea to reviewed implementation with less manual coordination. GSD Pi is built around an execution loop that keeps AI-assisted engineering honest: discuss messy intent into explicit scope, plan durable slices with the right context, execute work in clean contexts and worktrees, verify behavior with evidence, and ship with clean commits and trustworthy handoffs. From the shell, users can start guided or quick coding sessions, break work into milestones, slices, and tasks, and let auto mode plan, implement, verify, and advance the work. It stores requirements, decisions, runtime notes, generated plans, summaries, and validation evidence.