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Spec-driven development

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Created: / Updated: / Status: in progress / Readability: 3 / 1 minute read (~139 words)
agents 42 spec-driven-development 7

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

  • BMad Method - the agile method that sizes ceremony to the change, roles and retrospectives included.
  • GitHub Spec Kit - the MIT process-plus-CLI layer that made specs-before-agents a movement, agent-neutral, 137.7k stars in year one.
  • GSD - the 64k-star get-shit-done workflow system for Claude Code, archived and continuing as open-gsd/gsd-core.
  • OpenSpec - the brownfield spec toolkit whose delta proposals archive into a living ledger, 1.6M npm downloads a month.
  • Tessl - 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.

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.