spec-driven-development

Spec-driven development is a workflow that defines a formal specification upfront to align engineering and stakeholders before coding. Use it for projects with ambiguous requirements or multi-module impact to maximize the benefit of spec-first planning and reduce costly rework.

To start writing a specification, draft a spec covering six core areas before any implementation begins. This surfaces assumptions early and defines boundaries and acceptance criteria to prevent scope creep during the subsequent planning phases.

The spec-first development workflow consists of four phases: Specify, Plan, Tasks, and Implement. Each phase includes explicit reviews and gate checks to ensure continuous alignment and track changes throughout the project delivery.

Spec-driven development is not ideal for small tasks. You should limit its use to projects with ambiguous requirements or multi-module impact, as the overhead of formal specs, gate checks, and change tracking maximizes benefit only at larger scopes.

A formal specification prevents scope creep by defining explicit boundaries and success criteria upfront. By surfacing ambiguities and assumptions early, it aligns cross-team stakeholders and establishes strict acceptance criteria for the final implementation.