One Plugin, Every Agent: Why the Agent Plugins Spec Matters
· 9 min read
Six plugins. One feature. That math never made sense.
Constellation ships a plugin for Claude Code. And one for Codex. And Copilot, Cursor, Antigravity, and OpenCode. Every one of them delivers the same thing: our MCP server plus a handful of skills that teach the agent when to reach for code intelligence. Six repositories, six manifest formats, six sets of installation docs, six release pipelines. The content is identical. The packaging never was.
So when the Agent Plugins specification hit 1.0.0, an open, vendor-neutral standard for packaging exactly this kind of thing, we didn't just take notice. We celebrated. This post is about why the spec matters, what it actually standardizes, where it still has gaps, and what we built with it.