diff --git a/index.ts b/index.ts
index 69dc945..c50ca75 100644
--- a/index.ts
+++ b/index.ts
@@ -41,6 +41,9 @@ const sleep = (msec: number) =>
 // #region misskey
 const me = await misskey.request("i", {});
 
+const isSuitableAsInput = (n: Note) =>
+  !n.user.isBot && !n.replyId && (!n.mentions || n.mentions.length === 0)
+
 /** randomly sample some notes from the timeline */
 async function getNotes() {
   // randomly sample N local notes
@@ -51,7 +54,7 @@ async function getNotes() {
       limit: 100,
     });
     // exclude bot notes
-    return sample(timeline.filter((p) => !p.user.isBot), count);
+    return sample(timeline.filter(isSuitableAsInput), count);
   }
 
   // randomly sample N global notes
@@ -62,7 +65,7 @@ async function getNotes() {
       limit: 100,
     });
     // exclude bot notes and replies
-    return sample(timeline.filter((p) => !p.user.isBot && !p.reply), count);
+    return sample(timeline.filter(isSuitableAsInput), count);
   }
 
   // randomly sample N notes of mine