[BUG] /plugin command fails with schema validation errors

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description

The /plugin command fails to load the marketplace due to schema validation errors.

## Error Output
Failed to load all marketplaces. Errors: claude-plugins-official: Invalid schema: plugins.2.source: Invalid
input, plugins.5.source: Invalid input, plugins.12.source: Invalid input, plugins.29.source: Invalid input,
plugins.49.source: Invalid input, plugins.58.source: Invalid input, plugins.64.source: Invalid input,
plugins.67.source: Invalid input, plugins.89.source: Invalid input, plugins.99.source: Invalid input,
plugins.107.source: Invalid input, plugins.115.source: Invalid input, plugins.116.source: Invalid input,
plugins.121.source: Invalid input

## Environment

• OS: macOS
• Claude Code version: [run claude --version to get this]

## Expected Behavior
The plugin marketplace should load and display available plugins.

## Actual Behavior
Marketplace fails to load due to 14 plugins having invalid source field formats.

What Should Happen?

The plugin marketplace should load and display available plugins.

Error Messages/Logs

## Error Output
  Failed to load all marketplaces. Errors: claude-plugins-official: Invalid schema: plugins.2.source: Invalid
  input, plugins.5.source: Invalid input, plugins.12.source: Invalid input, plugins.29.source: Invalid input,
  plugins.49.source: Invalid input, plugins.58.source: Invalid input, plugins.64.source: Invalid input,
  plugins.67.source: Invalid input, plugins.89.source: Invalid input, plugins.99.source: Invalid input,
  plugins.107.source: Invalid input, plugins.115.source: Invalid input, plugins.116.source: Invalid input,
  plugins.121.source: Invalid input

Steps to Reproduce

Start /plugin command. Marketplace fails to load due to 14 plugins having invalid source field formats.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.19

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_