OpenSpec CLI Offers Lightweight Spec-Driven Development for AI Coding Agents

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Fission AI has released OpenSpec, a free open-source command-line tool designed to help developers and AI coding agents agree on a proposed change in plain Markdown before any code is written. The tool targets a common pain point in spec-driven development by limiting documentation to only what a given change actually touches, using ADDED, MODIFIED, and REMOVED deltas rather than full system rewrites. Each change generates up to four Markdown files — covering the proposal, delta requirements, an optional design note, and an implementation task list — stored in a dedicated folder within the project. OpenSpec is built on Node.js (version 20.19.0 or newer) and supports over 30 AI assistants including Claude Code, Cursor, GitHub Copilot, and Gemini CLI. The tool is positioned as a lighter alternative to heavier spec-driven frameworks and has been compared alongside GitHub Spec Kit, Kiro, and Superpowers in discussions about SDD tooling.

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