Drag-to-Settings install silently fails; double-click works (docs mismatch)

[zhuoerwang]

Describe the bug

The Desktop Extensions blog post says to install an extension by dragging the .mcpb file into
Claude Desktop's Settings window. On my setup that does nothing — no install prompt appears.
Double-clicking the .mcpb file in Finder works reliably and is what actually triggers the
Extensions installer.

So either drag-to-Settings has regressed in the app, or the documented instructions are out of
date and should say "double-click the file" instead. (Filing here since this repo is linked from
that post — please redirect if the Claude Desktop app or docs team is the right owner.)

To Reproduce
Steps to reproduce the behavior:

1. Pack an extension into a .mcpb file (mcpb pack).
2. Open Claude Desktop → Settings → Extensions.
3. Drag the .mcpb file from Finder onto the Settings window, as the blog post describes → nothing
   happens, no install dialog.
4. Now double-click the same .mcpb file in Finder → the Extensions installer opens correctly.

Expected behavior

Dragging a .mcpb file into the Settings window should open the install prompt, matching the blog
post. Double-click already works, so at minimum the post should be updated to document
double-click as the install method (or fix drag-and-drop to match the docs).

Logs

N/A — no error surfaced; the drag is silently ignored. Double-click installs without issue.

Additional context

• OS: macOS 26.5.1 (build 25F80)
• Claude Desktop: 1.12603.1
• Working method: double-clicking the .mcpb file.