PAN DevTools Extension - Restart Required

Current Status: Configuration Added, Restart Needed ⏳

I've confirmed via chrome-devtools MCP that the extension is NOT yet loaded in Chrome.

Evidence from chrome://extensions/

No extensions loaded (empty state shown)

Evidence from Console

Missing: [PAN DevTools] Injected and monitoring PAN messages
Present: [PAN Bus] PAN Bus Enhanced ready
Present: [pg-bus-monitor] Starting monitoring...

Why It's Not Working Yet

The MCP server configuration I added to:

/Users/cdr/Library/Application Support/Claude/claude_desktop_config.json

...is only read when Claude Desktop launches. The chrome-devtools MCP server that's currently running was started with the OLD configuration (no extension args).

What You Need To Do

1. Quit Claude Desktop Completely

Cmd+Q (or File → Quit)

Make sure it's fully quit, not just closed window.

2. Reopen Claude Desktop

3. Wait for MCP Initialization

4. Verify Extension Loaded

Ask me:

Can you check if the PAN DevTools extension loaded in chrome://extensions/?

I'll verify:

• Extension appears in chrome://extensions/
• Console shows: [PAN DevTools] Injected and monitoring PAN messages
• API exists: window.__panDevTools

What Will Happen After Restart

The chrome-devtools MCP server will launch Chrome with these args:

--load-extension=/Users/cdr/Projects/larc-repos/devtools
--disable-extensions-except=/Users/cdr/Projects/larc-repos/devtools

Chrome will:

Extension Files (Ready to Load)

All files are in place:

/Users/cdr/Projects/larc-repos/devtools/
├── manifest.json ✅ (valid Manifest V3)
├── devtools.html ✅
├── panel.html ✅
├── icons/ ✅
│   ├── icon-16.png
│   ├── icon-48.png
│   └── icon-128.png
└── src/ ✅
    ├── background.js ✅ (service worker)
    ├── content-script.js ✅ (bridge)
    ├── devtools.js ✅ (panel creation)
    ├── injected.js ✅ (event interception with debug logs)
    └── panel.js ✅ (UI logic)

Alternative: Test Extension Manually (Without Restart)

If you want to test the extension before restarting Claude Desktop:

# Launch Chrome manually with extension
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome \
  --load-extension=/Users/cdr/Projects/larc-repos/devtools \
  --disable-extensions-except=/Users/cdr/Projects/larc-repos/devtools \
  --user-data-dir=/tmp/chrome-test-pan-extension \
  http://localhost:8080/playground/

# Then:
# 1. Open DevTools (F12)
# 2. Look for "PAN" tab
# 3. Load an example (e.g., Drag & Drop List)
# 4. Interact with it
# 5. See messages appear in PAN panel

Expected Console Output After Restart

When the extension loads properly:

[PAN DevTools] Injected and monitoring PAN messages
[PAN Bus] PAN Bus Enhanced ready
[pg-bus-monitor] Starting monitoring...
[PAN DevTools] Intercepted event: pan:publish ...
[PAN DevTools] Posting message to content script: ...

Configuration Applied

File: /Users/cdr/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "chrome-devtools": {
      "command": "npx",
      "args": [
        "chrome-devtools-mcp",
        "--chrome-arg=--load-extension=/Users/cdr/Projects/larc-repos/devtools",
        "--chrome-arg=--disable-extensions-except=/Users/cdr/Projects/larc-repos/devtools"
      ]
    }
  }
}

Summary

• ✅ Configuration file updated
• ✅ Extension files ready
• ✅ Manifest valid
• ⏳ Waiting for Claude Desktop restart
• ⏳ Then extension will load automatically