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Quality score 85Aopenspec.dev#agents#design#no-code#productivity#writing

OpenSpec: A Lightweight and Configurable Spec Framework

OpenSpec is a lightweight and configurable framework that helps software teams and coding agents create, refine, and manage living software specifications. It integrates with a wide range of coding agents and generates the corresponding skill and command files.

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About this tool

What

OpenSpec is OpenSpec is a lightweight and configurable framework for creating and managing software specifications. It is aimed at software teams, AI coding agent users, and developers, and helps them create, refine, and manage living specifications.

Key capabilities

  • Spec creation and management: Used to create and manage software specifications. According to the project, a new spec is created with OpenSpec every two seconds.
  • Broad coding agent integrations: Supports AGENTS, OpenCode, Kilo Code, WindSurf, Codex, GitHub Copilot, Amazon Q Developer CLI, Droid CLI, Cline, Crush, Auggie, CodeBuddy, Gemini CLI, RooCode, Antigravity, iFlow, and Continue.
  • Generated agent files: Generates openspec-* skills and opsx commands per project under directories such as .claude/ or .agents/; MiniMax Code keeps skills in ~/.minimax/skills.
  • Shared skill tree: Targets such as Antigravity, Codex, and Zed Agent can share one physical skill tree. OpenSpec records one writer in .openspec-target and writes the tree once per run, while still generating each tool's separate command files.
  • Legacy folder cleanup: After writing replacements, it removes equivalent generated files from .agent/; custom files and changed generated files stay in .agent/ for review.
  • Feedback command and Nix support: Includes a Feedback command and Nix support.

Availability

OpenSpec is open-source and free to use. The code is hosted on GitHub (Fission-AI/OpenSpec), and there is a Discord community. The project has also announced bringing the OpenSpec Cloud Agent into early access.

Best for
  • Software teams that maintain specifications alongside AI coding agents
  • Developers using agents such as Codex, GitHub Copilot, or Gemini CLI
  • Teams wanting a lightweight, configurable way to manage software specs
  • Projects that need to share a skill tree across multiple coding agents
Use cases
  • Integrating specs with AI coding agents like Codex and GitHub Copilot
  • Creating and managing software specifications
  • Generating agent skill and command files for coding tools
  • Collaborating on living specifications across repositories
Strengths
  • Open-source and free to use
  • Broad integration coverage across many coding agents, including Codex, GitHub Copilot, Gemini CLI, and RooCode
  • Automatically generates agent skill and command files for each tool
  • Supports multiple targets sharing one physical skill tree, reducing duplicate writes
  • Provides a Discord community and a GitHub repository
  • Reports a new spec created every two seconds, indicating adoption
Limitations
  • Pricing model is listed as unknown; beyond being free and open-source, no other pricing tiers are disclosed
  • Learning curve is medium
  • Requires generating and configuring agent files per project (e.g. .claude/, .agents/, or ~/.minimax/skills)
  • The OpenSpec Cloud Agent is currently only in early access

Features & use cases

Create and manage software specificationsSupports AGENTS, OpenCode, Kilo Code, WindSurf and moreSupports Codex and GitHub CopilotSupports Amazon Q Developer CLI and Droid CLISupports Cline, Crush, Auggie, CodeBuddySupports Gemini CLI, RooCode, Antigravity, iFlow, ContinueGenerates openspec-* skills and opsx commands per projectShared skill tree with a single recorded writerRemoves equivalent generated files from .agent/Feedback commandNix support

At a glance

Monetization
  • Free
Maturity signals
  • Open source
Learning curve
  • Medium

Sources

Every profile keeps its sources and latest verification date.
01https://openspec.dev/blog/openspec-cloud-agents

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