OpenSpec
OpenSpec is a lightweight, artifact-guided spec framework and CLI that aligns humans and AI coding assistants before code is written. It creates proposals, requirements, designs, and tasks in-repo, integrates with 30+ tools, and scales from solo projects to cross-repo teams.
Overview
You describe a change with a slash command; OpenSpec generates a structured change folder containing proposal, specs, design, and tasks. Review and refine the plan, then let your coding agent apply tasks, verify outcomes, and archive the change once complete for a clean audit trail.
What It Delivers
OpenSpec is ideal for engineers, tech leads, platform teams, and AI‑enabled organizations that need predictable delivery from coding assistants. It suits brownfield adoption where multiple repos, services, or owners complicate planning, and greenfield efforts that want clarity from day one. OSS maintainers can require specs before contributions; startups can iterate quickly while preserving intent; regulated teams gain an auditable trail of requirements, designs, and verification steps captured directly in Git.
- Generates proposal, specs, design, and task artifacts from a single slash command.
- Applies implementation tasks automatically with your chosen coding agent or IDE.
- Supports cross‑repo planning via Stores for platform and multi‑service changes.
- Works with 30+ assistants through standardized command names and aliases.
- Keeps everything in Git: auditable plans, diffs, and archived changes.
Key Capabilities
Who It’s For
Install prerequisites and initialize a project. Requires Node.js 20.19+. Run: npm install -g @fission-ai/openspec@latest, then openspec init in your repo. Use /opsx:explore to shape options or /opsx:propose <feature> to scaffold a change. Apply tasks with /opsx:apply and archive when complete. Refresh agent instructions anytime with openspec update. Select the expanded workflow via openspec config profile to enable additional commands. OpenSpec works with pnpm, yarn, bun, and nix, and integrates with 30+ assistants using standardized aliases compatible with tools like Cursor, GitHub Copilot, and Amazon Q.
Agree on the plan, then let your agent implement it — with everything versioned in Git.
Getting Started
OpenSpec adds a thin, durable spec layer to AI coding, producing clear intent, executable tasks, and verifiable outcomes without heavyweight process. It scales from single-repo changes to cross‑repo programs via Stores, remains tool‑agnostic, and keeps everything in Git. The result is faster iteration, fewer surprises, and a shared plan your agents can actually follow.
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OpenSpec
Fission AI builds developer tooling that makes AI‑assisted software development reliable at scale. The team focuses on reproducible workflows, artifact‑guided planning, and integrations across popular coding assistants and package managers. OpenSpec reflects that mission: practical, tool‑agnostic, and designed to work in real engineering environments.
OpenSpec is a spec-driven development framework and CLI that converts fuzzy prompts into concrete, reviewable plans before implementation. From a single command, it scaffolds a change folder with a proposal, plain‑Markdown requirements with scenarios, a technical design, and an implementation checklist. Those artifacts then drive application and verification, keeping humans and agents aligned as work evolves. OpenSpec works across 30+ assistants and IDEs via consistent slash commands, so teams keep their existing tools while gaining structure. For larger programs, Stores enable cross‑repo planning in a dedicated spec repository, providing a single source of truth that downstream code repos implement. It installs as a Node.js package, supports common package managers, and includes opt‑out telemetry. The result is predictable delivery: clear intent captured as code, auditable diffs, and tasks your chosen agent can apply with confidence.
github.com/Fission-AI/openspec
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