diff --git a/frontend/packages/agent/src/app.js b/frontend/packages/agent/src/app.js
index 248a70e0..63916293 100644
--- a/frontend/packages/agent/src/app.js
+++ b/frontend/packages/agent/src/app.js
@@ -1662,8 +1662,9 @@ window.marked = marked;
         case 'mcp__matrix__send_reaction':
           return short + ' ' + fmtRoom(input.room) + ' ' + (input.key || '?');
         case 'mcp__matrix__join_room':
+          return short + ' ' + fmtRoom(input.room);
         case 'mcp__matrix__open_dm':
-          return short + ' ' + (fmtRoom(input.room) || fmtUser(input.user_id) || '?');
+          return short + ' ' + fmtUser(input.user_id);
         case 'mcp__matrix__invite_user':
           return short + ' ' + fmtUser(input.user_id) + ' → ' + fmtRoom(input.room);
         case 'mcp__matrix__download_file':