Validate Plugin

This runs a comprehensive check on your Claude Code plugin structure before you publish it. It verifies your plugin.json schema, makes sure every declared skill, command, and agent has a corresponding markdown file in the right place, validates frontmatter fields like name and description, and checks that MCP tool references follow the correct format. The validation is thorough enough to catch the annoying mistakes that would otherwise break your plugin, like missing required fields or files in the wrong directory. If you're building plugins, this should probably be your last step before sharing anything.