diff --git a/apps/api/src/utils/is-hangul-jamo-choseong-filler-present.ts b/apps/api/src/utils/is-hangul-jamo-choseong-filler-present.ts
new file mode 100644
index 0000000000..87ec73f751
--- /dev/null
+++ b/apps/api/src/utils/is-hangul-jamo-choseong-filler-present.ts
@@ -0,0 +1,3 @@
+export function isHangulJamoChoseongFillerPresent(input: string): boolean {
+  return input.includes("\u{115F}");
+}
diff --git a/contributors/agents.json b/contributors/agents.json
index a3fbd7156d..a850d5b375 100644
--- a/contributors/agents.json
+++ b/contributors/agents.json
@@ -1,5 +1,13 @@
 {
-  "agents": [],
-  "last_updated": "2026-06-03",
-  "total_contributions": 0
+  "agents": [
+    {
+      "github_username": "yanyishuai",
+      "model": "cursor-agent",
+      "version": "2026-07-13",
+      "pr_number": 0,
+      "issue_number": 8632
+    }
+  ],
+  "last_updated": "2026-07-13",
+  "total_contributions": 1
 }