可移植 plugin.json（Agent Plugins）

放在插件根。技能走 skills/，MCP 另写 mcp.json。OpenAI 专用字段进 extensions.com.openai，会整份替换 overlay。

{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "my-first-plugin",
  "version": "1.0.0",
  "description": "Reusable greeting workflow",
  "extensions": {
    "com.openai": {
      "hooks": "./hooks/hooks.json",
      "interface": {
        "displayName": "My Plugin",
        "shortDescription": "Reusable skills and MCP servers",
        "developerName": "Your team",
        "category": "Productivity"
      }
    }
  }
}