Verified project record

Fission-AI/OpenSpec

OpenSpec adds a specification layer to AI-assisted coding so teams agree on requirements before implementation. It uses slash commands to generate and manage proposals, design documents, specs, and tasks within existing projects.

Project overview

Project type: AI Coding · Workflow
Use cases: Coding & Development
Deployment: Refer to project documentation
License: MIT

Best for

Developers working in existing codebases who want a fluid specification workflow for AI coding assistants.

Key capabilities

Provides slash commands including /opsx:explore, /opsx:propose, /opsx:apply, and /opsx:archive for AI coding assistants to generate and manage proposals, specs, design, and tasks.
Initializes an OpenSpec configuration in a project directory via the openspec init CLI command.

Limitations and risks

The tool is built for brownfield projects, not just greenfield development.

Getting started

Install the package globally via npm and run the init command in your project directory to configure OpenSpec.

Evidence and sources

GitHub project description: Spec-driven development (SDD) for AI coding assistants.
README: → fluid not rigid → iterative not waterfall → easy not complex → built for brownfield not just greenfield → scalable from personal projects to enterprises
README: AI: Created openspec/changes/add-dark-mode/ ✓ proposal.md — why we're doing this, what's changing ✓ specs/ — requirements and scenarios ✓ design.md — technical approach ✓ tasks.md…
README: Run `/opsx:propose "your idea"` to get started.
README: **Requires Node.js 20.19.0 or higher.** Install OpenSpec globally: ```bash npm install -g @fission-ai/openspec@latest ``` Then navigate to your project directory and initialize: `…

Reviewed at: 2026-07-17T05:50:02Z