[BUG] MCPs added by plugin seem to be ignored

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?

I've defined https://github.com/aimoda/claude-code-remote-camera-plugin/blob/main/.mcp.json and referenced it in https://github.com/aimoda/claude-code-remote-camera-plugin/blob/main/.claude-plugin/plugin.json, but it seems like it's still completely ignored.

I don't even see a request being sent to the remote MCP server.

What Should Happen?

Tools from the MCP server defined in .mcp.json and .claude-plugin/plugin.json should be loaded and available to a plugin's skills.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code and run:
2. /plugin marketplace add aimoda/claude-code-plugin-marketplace
3. /plugin install remote-camera@aimoda
4. /quit
5. Reopen Claude Code
6. Enter Can you try using the remote camera? into Claude Code. You'll see it eventually complains that it has no tools for that.

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

v2.0.28

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_