Trouble connecting to Mac Figma App with Dev mode.

Summary

When launching the Cursor MCP Plugin from Figma's Dev Mode right-sidebar Plugins panel (a natural place to look, since the sidebar lists installed plugins), clicking the plugin row throws this error in the Figma plugin console:

Plugin not compatible to run in dev handoff panel. Make sure you have "dev" as an editorType and "inspect" as a capability in your manifest.json.

The plugin does not launch. There's no in-product hint, no toast — just silence in the UI unless you've opened the plugin console (Cmd+/ → "Open Console") on a hunch.

Repro

1. Install / link the plugin locally via Plugins → Development → Import plugin from manifest… pointing at src/cursor_mcp_plugin/manifest.json.
2. Open a Figma file in Dev Mode (Shift+D, or the Dev Mode toggle in the top-right of any file).
3. In the right sidebar, switch to the Plugins tab.
4. Click the Cursor MCP Plugin row.
5. Nothing happens. Open the console — the error above is logged.

Why this is friction

• The README walks users through "link via manifest → launch", but if they happen to be in Dev Mode (which many designer-handoff workflows default to), the plugin silently refuses with no surfaced error.
• The current manifest.json is "editorType": ["figma", "figjam"] with no capabilities key — so Figma rejects the plugin in Dev Mode handoff panel context.
• The fix is a one-line manifest tweak, but it's not documented and most users won't find it without opening the plugin console.

Suggested fixes (pick one)

Option A — make the plugin Dev-Mode-capable in the manifest (allows launching from the sidebar handoff panel that Dev Mode users land in):

"editorType": ["figma", "figjam", "dev"],
"capabilities": ["inspect"],

I

We did this edit manually in our local copy of the repo and everything started working.

Option B — document the limitation in the README: add a short "Troubleshooting" section noting that the plugin runs from Design mode only (macOS menu bar → Plugins → Development → Cursor MCP Plugin), and that the Dev Mode sidebar will throw the error above.

Option A is friendlier; Option B is lower-risk if Dev Mode introduces other constraints I'm not seeing.

Environment

• Figma desktop app (macOS)
• Plugin commit: 1c46823
• Plugin loaded as: Development (linked from local manifest)