diff --git a/src/main/ai/AiWorker.ts b/src/main/ai/AiWorker.ts
index b9181b3..d08b348 100644
--- a/src/main/ai/AiWorker.ts
+++ b/src/main/ai/AiWorker.ts
@@ -166,8 +166,9 @@ export class AiWorker {
             }
           }).catch(() => {});
           // v0.2.3 #3 — per-tag vocab hit/miss 분류 (updateAiResult 후 → tagId 보장)
+          // dedup: AI 응답에 같은 태그 중복 가능 — INSERT OR IGNORE 와 정합한 1-emit/태그 보장
           const vocabSet = new Set(vocab);
-          for (const tagName of res.tags) {
+          for (const tagName of new Set(res.tags)) {
             if (vocabSet.has(tagName)) {
               const tagId = this.repo.getTagIdByName(tagName);
               if (tagId !== null) {
diff --git a/tests/unit/AiWorker.test.ts b/tests/unit/AiWorker.test.ts
index cc62f66..afc0bbe 100644
--- a/tests/unit/AiWorker.test.ts
+++ b/tests/unit/AiWorker.test.ts
@@ -531,4 +531,30 @@ describe('AiWorker — vocab fetch + per-tag hit/miss (v0.2.3 #3 T7)', () => {
     const hits = emits.filter((e) => e.kind === 'tag_vocab_hit');
     expect(hits).toHaveLength(3);
   });
+
+  it('dedupes duplicate tags in AI response (one emit per unique tag)', async () => {
+    // Pre-seed: 'design' in vocab
+    const seed = repo.create({ rawText: 'seed' }).id;
+    repo.updateAiResult(seed, { title: 't', summary: 'a\nb\nc', tags: ['design'], provider: 'p' });
+
+    const { id } = repo.create({ rawText: 'x' });
+    const provider = makeProvider({
+      generate: vi.fn(async () => ({
+        title: 't', summary: 'a\nb\nc',
+        tags: ['design', 'design', 'meeting'],  // 중복 'design' 의도적
+        dueDate: null
+      }))
+    });
+    const emits: EmittedEvent[] = [];
+    const w = new AiWorker(repo, provider, {
+      backoffsMs: [0, 0, 0],
+      telemetry: { emit: vi.fn(async (input) => { emits.push(input); }) }
+    });
+    await w.enqueue(id);
+    await w.drain();
+    const hit = emits.filter((e) => e.kind === 'tag_vocab_hit');
+    const miss = emits.filter((e) => e.kind === 'tag_vocab_miss');
+    expect(hit).toHaveLength(1);  // 'design' 중복 → 1 hit (dedup)
+    expect(miss).toHaveLength(1);  // 'meeting' 1 miss
+  });
 });
diff --git a/tests/unit/NoteRepository.test.ts b/tests/unit/NoteRepository.test.ts
index 8097b9b..ff87460 100644
--- a/tests/unit/NoteRepository.test.ts
+++ b/tests/unit/NoteRepository.test.ts
@@ -716,6 +716,21 @@ describe('NoteRepository — failed retry helpers', () => {
     expect(repo.getTopUsedTags(10)).toHaveLength(5);
   });
 
+  it('getTopUsedTags result may be shorter than limit when top-N includes non-kebab tags', () => {
+    // 비-kebab 1개 (한글) + kebab 2개 → top-3 으로 SQL 가져온 후 regex 필터로 한글 제외
+    // 결과 length = 2 (limit=3 보다 작음)
+    const a = repo.create({ rawText: 'a' }).id;
+    const b = repo.create({ rawText: 'b' }).id;
+    const c = repo.create({ rawText: 'c' }).id;
+    repo.updateUserAiFields(a, { tags: ['회의'] });  // 한글 — SQL top 에 포함될 수 있지만 regex 통과 X
+    repo.updateUserAiFields(b, { tags: ['design'] });
+    repo.updateUserAiFields(c, { tags: ['meeting'] });
+    const top = repo.getTopUsedTags(3);
+    expect(top.length).toBeLessThan(3);  // SQL 은 3개 가져왔지만 regex 가 1개 제거
+    expect(top).not.toContain('회의');
+    expect(top).toEqual(expect.arrayContaining(['design', 'meeting']));
+  });
+
   it('getTagIdByName returns id when present, null when absent', () => {
     const a = repo.create({ rawText: 'a' }).id;
     repo.updateAiResult(a, { title: 't', summary: 'a\nb\nc', tags: ['hello'], provider: 'p' });