Spec-Driven Development: OpenSpec vs Tiden

Tiden is presented as a platform that extends spec-driven development beyond documenting intent before AI-assisted implementation by maintaining a continuously updated, graph-based specification of an entire system. In contrast to OpenSpec’s change-scoped workflow, which records proposals, delta specifications, designs, and tasks for individual changes before merging them into repository specifications, Tiden aims to map relationships among behaviors, dependencies, integrations, and tests across the product. The text argues that this system-level model enables cross-impact analysis, risk-based regression testing, verification against approved intent, evidence-based sign-off, and a lasting record of changes and approvals. It notes that spec-driven frameworks can face challenges such as manual specification updates, optional or agent-performed verification, limited system-wide checks, and lack of enforcement or regression analysis. Teams can use OpenSpec to create change specifications while using Tiden for verification and impact analysis, or use Tiden alone for planning, review, implementation guidance, and verification.

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