Spec Kit

Spec Kit is an open-source toolkit that gives AI coding agents structured processes, reusable templates and documented outcomes instead of open-ended prompting. It offers three independent processes a user can start from: Spec-Driven Development, which carries a specification through planning, implementation and convergence; bug fixing, which produces an assessed cause, a scoped fix and a recorded verification; and idea assessment, which produces an evidence-backed decision to go ahead, clarify or stop.

Spec-Driven Development ships as the toolkit's core, while bug fixing and idea assessment are separate installable extensions. Each process is invoked as a set of agent skills, run one at a time in the user's coding agent, with the user reviewing the result before continuing. The project is installed with a Python CLI (specify-cli) and supports several coding agents, including GitHub Copilot.