OpenSpec is a lightweight, configurable framework for authoring and managing software specifications that aims to keep teams and coding agents aligned as a project evolves. It frames work around capturing requirements in specs, refining them, validating that they describe the intended behavior, and verifying that implementations match those specs - summarized by its goal to help teams "build the right thing" and "build it right." The project highlights a measurable focus on drift control (e.g., "DRIFT 0.045") and supplies concrete artifacts like proposal.md, specs/, design.md, and tasks.md to structure requirements and deliverables.
Adopted widely as open-source (MIT), OpenSpec emphasizes practical integration: installation via common package managers (npm install -g @fission-ai/openspec@latest) and compatibility with dozens of AI coding assistants and agents (examples include Claude, GitHub Copilot, Gemini, and many more). A prescribed opsx workflow (explore → propose → apply → verify → archive) drives spec creation, implementation, and verification. Adoption signals include 68.0K GitHub stars, a claim of one new spec every two seconds, and tens of thousands of monthly developers, positioning OpenSpec as a popular, lightweight tooling layer for AI-assisted software development.
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