1. What OpenSpec Is OpenSpec is an open-source Spec-Driven Development framework maintained by Fission-AI. It does not try to teach AI new coding tricks. Instead it adds a lightweight “agreement layer” between you and the AI — before any code is written, both sides settle on what to do, in writing.

1. What OpenSpec Is OpenSpec is an open-source, lightweight AI-assisted spec-driven development framework. It stores specs and changes in Markdown files, drives the AI assistant with slash commands (such as /opsx:propose and /opsx:apply), and uses a CLI to manage state, validate format, and archive changes. In short, it turns “requirements talked out in a conversation” into a “traceable, iterable, archivable contract” — align before writing code, correct at any point during implementation, and when you are done, let the change settle into the source of truth for system behavior.