OpenSpec: Lightweight Specification Framework for Developers and Coding Agents

LinkFissionTool

Fission provides OpenSpec, an open-source framework (MIT license) designed to manage software specifications and keep human teams aligned with AI coding agents across development workflows.

Key points

  1. Open-source specification framework released under the MIT license.
  2. Aligns human teams and AI coding agents by refining requirements and verifying implementations.
  3. Structured command workflow featuring /opsx:explore, /opsx:propose, /opsx:apply, /opsx:verify, and /opsx:archive.
  4. Compatible with tools including Claude Code, Cursor, GitHub Copilot, Devin Desktop, and Gemini CLI.
  5. Installable via npm, pnpm, bun, yarn, or nix (@fission-ai/openspec@latest).

Why it matters

As AI agents increasingly handle implementation details, clear specifications become essential to prevent scope drift and errors. OpenSpec formalises the process of defining, executing, and verifying tasks.

Analysis

OpenSpec addresses the disconnect between high-level prompts and structured engineering. By enforcing steps from exploration to proposal files (proposal.md, specs/, design.md, tasks.md) and post-implementation verification, it embeds specifications into the automated agent loop. As of version 1.11.0, Fission reports over 66,000 GitHub stars and 265,000 monthly active developers.

Mentioned links

Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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