Spec Kit is an open-source toolkit from GitHub that makes a product specification the central artifact of the engineering process. It provides tooling to convert specs into technical implementation plans, automatically break those plans into actionable tasks, and assist developers in implementing those tasks with AI integrations and editor workflows. The toolkit includes CLI and editor workflows (e.g., VS Code) to create, iterate on, and manage specs as living documents; it integrates with multiple LLMs and developer tools to generate plans, task lists, and scaffolding so teams can move from spec to implementation more predictably. Spec Kit is positioned as an experiment and community-driven project to explore spec-driven development patterns and extendibility via open-source contributions.