Mcp server "list folders" tool possibly showing strangers folders

Asked Claude a newsblur question today and the list folder tool returned what looks like someone elses folders, if this is what is happening it makes me very concerned as to what the mcp backend code looks like.

I hope this is just default data or some global folders I’m unaware of, though of course I’d like the tool to show my folders to actually be useful.

Tool returned the followng data

{
  "folders": [
    {
      "name": "Top Level",
      "feed_count": 0,
      "unread_count": 0,
      "focus_count": 0
    },
    {
      "name": "faith",
      "feed_count": 26,
      "unread_count": 30,
      "focus_count": 0
    },
    {
      "name": "comics",
      "feed_count": 4,
      "unread_count": 4,
      "focus_count": 0
    },
    {
      "name": "dc",
      "feed_count": 5,
      "unread_count": 74,
      "focus_count": 0
    },
    {
      "name": "readery",
      "feed_count": 45,
      "unread_count": 539,
      "focus_count": 0
    },
    {
      "name": "friends",
      "feed_count": 13,
      "unread_count": 10,
      "focus_count": 0
    },
    {
      "name": "design",
      "feed_count": 9,
      "unread_count": 55,
      "focus_count": 0
    },
    {
      "name": "ROC",
      "feed_count": 4,
      "unread_count": 18,
      "focus_count": 0
    },
    {
      "name": "news",
      "feed_count": 4,
      "unread_count": 991,
      "focus_count": 0
    },
    {
      "name": "tech",
      "feed_count": 9,
      "unread_count": 1100,
      "focus_count": 0
    },
    {
      "name": "Apple",
      "feed_count": 8,
      "unread_count": 1230,
      "focus_count": 0
    },
    {
      "name": "Apple - Refurb-Tracker",
      "feed_count": 1,
      "unread_count": 0,
      "focus_count": 0
    },
    {
      "name": "Microsoft",
      "feed_count": 3,
      "unread_count": 210,
      "focus_count": 0
    },
    {
      "name": "Canada",
      "feed_count": 4,
      "unread_count": 635,
      "focus_count": 0
    },
    {
      "name": "Newsletters",
      "feed_count": 1,
      "unread_count": 0,
      "focus_count": 0
    },
    {
      "name": "Electric",
      "feed_count": 4,
      "unread_count": 698,
      "focus_count": 0
    },
    {
      "name": "Food",
      "feed_count": 8,
      "unread_count": 900,
      "focus_count": 0
    },
    {
      "name": "Home",
      "feed_count": 3,
      "unread_count": 62,
      "focus_count": 0
    }
  ],
  "folder_count": 18
}

Ugh, the first time I tried using a disk cache and it blows up. I removed all caching and this shouldn’t happen again. The MCP server is now isolated per-user. The fix has been deployed and thank you for reporting this.

1 Like

Thanks for the quick fix! Caching can be wierd, I get it.

Thanks for the openness regarding the issues origin.