---
showArticleList: false
title: Spec-driven development
created: 2026-09-24
visible: true
status: in progress
tags: [agents, spec-driven-development]
readability: 3
---

Specification-first workflows: the movement's process layers and toolkits, sized from brownfield delta proposals to platform bets you rent.

- [BMad Method](bmad-method/index.md) - the agile method that sizes ceremony to the change, roles and retrospectives included.
- [GitHub Spec Kit](spec-kit/index.md) - the MIT process-plus-CLI layer that made specs-before-agents a movement, agent-neutral, 137.7k stars in year one.
- [GSD](gsd/index.md) - the 64k-star get-shit-done workflow system for Claude Code, archived and continuing as open-gsd/gsd-core.
- [OpenSpec](openspec/index.md) - the brownfield spec toolkit whose delta proposals archive into a living ledger, 1.6M npm downloads a month.
- [Tessl](tessl/index.md) - the $125M platform bet that spec-driven development is infrastructure you rent.

Its members are compared on shared rows in the [Spec Driven Development Feature Matrix](spec-driven-development-feature-matrix/index.md).

## Changes

- 2026-08-26 - Added GitHub Spec Kit.
- 2026-08-27 - Added BMad Method.
- 2026-08-27 - Added OpenSpec.
- 2026-08-27 - Added Tessl.
- 2026-09-16 - Added GSD.