[BUG] ExitPlanMode is not available when `--dangerously-load-development-channels` is enabled

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?

When I run claude --strict-mcp-config --mcp-config '{"mcpServers":{}}' --setting-sources "" --dangerously-load-development-channels plugin:fakechat@claude-plugins-official --permission-mode plan -p "Is the ExitPlanMode tool available? If so, exit plan mode", Claude Code cannot exit plan mode and reports The ExitPlanMode tool is not available in this session, so I cannot exit plan mode programmatically. You can exit plan mode manually by toggling it off in your Claude Code settings or interface.

I can confirm that ExitPlanMode is available in my current version of Claude Code when not providing the --dangerously-load-development-channels flag.

In 2.1.81, you get this (which is expected):

⏺ Exited plan mode                                                                                                                                                                                                      
                                                                                                                                                                                                                      
⏺ Yes, ExitPlanMode is available and plan mode has been exited.

What Should Happen?

• Plan mode should work normally when using --dangerously-load-development-channels
• ExitPlanMode should be available to Claude as a tool even when using --dangerously-load-development-channels

In 2.1.81, you get this (which is expected):

⏺ Exited plan mode                                                                                                                                                                                                      
                                                                                                                                                                                                                      
⏺ Yes, ExitPlanMode is available and plan mode has been exited.

Error Messages/Logs

The ExitPlanMode tool is not available in this session, so I cannot exit plan mode programmatically. You can exit plan mode manually by toggling it off in your Claude Code settings or interface.

Steps to Reproduce

1. start Claude Code with --dangerously-load-development-channels: ex. claude --strict-mcp-config --mcp-config '{"mcpServers":{}}' --setting-sources "" --dangerously-load-development-channels plugin:fakechat@claude-plugins-official
2. Enter plan mode (shift-tab)
3. Prompt: "Is the ExitPlanMode tool available? If so, exit plan mode"

You should get: "The ExitPlanMode tool is not available in this session, so I cannot exit plan mode programmatically. You can exit plan mode manually by toggling it off in your Claude Code settings or interface."

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.81

Claude Code Version

2.1.84 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_