Product / UX / Orchestration & agents

Spec Kit

GitHub's open source toolkit for Spec-Driven Development that works with coding agents rather than being one. A structured Specify -> Plan -> Tasks -> Implement workflow produces Markdown artifacts that feed each phase, giving agents rich structured context instead of ad-hoc prompts. The specify CLI scaffolds these files and orchestrates 30+ agents (Copilot, Claude Code, Cursor, Gemini CLI, Codex CLI, Windsurf, Zed, OpenCode).

MIT (c) GitHub. ~113k stars. Git-based distribution (uv tool install from the repo); no PyPI telemetry. No paid tier.

Openness

5 high confidence

5.0

license: MIT(OSI)
source: public
core-gated: ungated

Fully MIT, free.

https://github.com/github/spec-kit recorded 2026-06-18
MIT, ~113k stars, Spec-Driven Development toolkit

Adoption

3 medium confidence

3.0

~113k stars but git-distributed with no download telemetry - stars_fallback (capped at 3; true usage higher).

https://api.github.com/repos/github/spec-kit recorded 2026-06-18
~113k stars, SPDX MIT

Capability

4 medium confidence

4.0

Methodology/orchestration layer over coding agents rather than a code-writing engine itself.

https://github.blog/ai-and-ml/generative-ai/spec-driven-development-with-ai-get-started-with-a-new-open-source-toolkit/ recorded 2026-06-18
SDD definition, four-phase process

Unchanged since 2026-07-30 (last edited, not re-checked)