GitHub Spec-Kit Hits 90K+ Stars as Spec-Driven Development Goes Mainstream

GitHub's open-source Spec-Kit, a toolkit for Spec-Driven Development (SDD) with AI coding agents, has reached over 90,000 stars and 8,000 forks on GitHub, making it one of the fastest-growing developer tooling repositories. The toolkit provides a structured six-step workflow (constitution, specify, plan, tasks, taskstoissues, implement) with a Specify CLI that bootstraps projects. It supports 29 named AI coding agent integrations including Claude Code, GitHub Copilot, Gemini CLI, Cursor, Windsurf, and Codex CLI. The latest release is v0.8.7 (May 7, 2026). The approach replaces ad-hoc prompting with a structured process where a constitution markdown file acts as a persistent contract between developer and agent. The project runs on Linux, macOS, and Windows.