Fission-AI/OpenSpec
OpenSpec
OpenSpec is a specification-driven development tool designed to maintain living documentation directly within a software repository. It functions as an automated documentation engine that tracks technical requirements alongside source code, ensuring that system specifications evolve in tandem with the implementation to prevent documentation drift.
The framework distinguishes itself through differential change tracking, which compares current code states against stored specifications to identify deviations between intended requirements and actual implementation. By integrating specification storage into the version control system and utilizing large language models to synthesize requirement deltas, the tool provides human-readable summaries of functional changes. This process creates a traceable link between business logic and technical output, allowing reviewers to understand the intent behind modifications without manually inspecting source code.
Beyond core tracking, the project supports broader engineering knowledge management by centralizing system capability definitions and indexing documentation for semantic retrieval. These capabilities facilitate software development lifecycle governance, ensuring that requirements remain visible and accessible to both developers and automated tools throughout the development process.