OpenSpec – Spec-Driven Development for AI Coding Assistants (openspec.dev)

OpenSpec is a new lightweight, spec-driven framework for building coding agents and CLIs that standardizes how tasks, tools, and workflows are described and executed across different AI coding platforms. It’s open source, local-first, and requires no API keys or Model Context Protocol (MCP), aiming to remove vendor lock-in and external dependencies. The project already provides native integrations (with custom slash commands) for Cursor, Claude Code, Codex, GitHub Copilot, opencode, Windsurf, and Kilo Code, with Gemini CLI, Amp, Roo Code, Auggie CLI, and Qwen Code listed as coming soon. You can install it via npm: npm install -g @fission-ai/openspec@latest. For the AI/ML community this matters because OpenSpec offers a portable interoperability layer for coding assistants: a single, machine-readable spec that different agents can interpret to run multi-tool workflows reproducibly and privately. That lowers friction for experimenting with or deploying alternative model backends and tooling, encourages ecosystem contributions (source is on GitHub), and enables local/offline workflows without cloud credentials. Technical implications include easier cross-platform agent development, standardized tool invocation, and quicker integration of new assistants — though practical reach will depend on adoption and the breadth of supported tooling and runtimes.