Spec-driven development (SDD) for AI coding assistants.
OpenSpec is a specification-driven development framework that records software requirements and implementation plans as readable Markdown artifacts. It helps developers and AI coding assistants agree on what should be built before code is written, including work spanning multiple repositories. The catalogue add-ons provide workflow skills and instructions for using OpenSpec.
Latest release v1.12.0 — v1.12.0 - Findings Reports, SourceCraft · 3 Sept 2026
These files are Fission-AI/OpenSpec's own configuration. They tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.
AGENTS.md — .agents/skills/draft-openspec-docs/SKILL.md A 81 tok .agents/skills/release-openspec/SKILL.md A 88 tok .agents/skills/verify-openspec-docs/SKILL.md A 68 tok .agents/skills/write-openspec-docs/SKILL.md A 55 tok