Index: test/custom-emojis.test.js
===================================================================
--- test/custom-emojis.test.js	(revision 8f8b40fc0285013c26499b06cfc6dc5762af9abd)
+++ test/custom-emojis.test.js	(revision 8f8b40fc0285013c26499b06cfc6dc5762af9abd)
@@ -0,0 +1,29 @@
+// FEP-9098: Klonkt keeps inbound custom-emoji tags and serves them on the C2S inbox read.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+process.env.DATABASE_PATH = ':memory:';
+process.env.PUBLIC_BASE_URL = 'https://test.example';
+const dbMod = await import('../src/config/database.js');
+dbMod.initializeDatabase();
+const { extractEmojiTags, timelineEmojis } = await import('../src/services/ActivityPubService.js');
+const AP = { extractEmojiTags, timelineEmojis };
+
+test('extractEmojiTags keeps only Emoji tags; timelineEmojis round-trips', () => {
+  const tag = [
+    { type: 'Mention', href: 'https://s/u/x' },
+    { type: 'Emoji', name: ':wave:', icon: { type: 'Image', url: 'https://s/wave.png' } },
+    { type: 'Hashtag', name: '#hi' },
+  ];
+  const json = AP.extractEmojiTags(tag);
+  assert.ok(json);
+  const back = AP.timelineEmojis(json);
+  assert.equal(back.length, 1);
+  assert.equal(back[0].name, ':wave:');
+  assert.equal(back[0].icon.url, 'https://s/wave.png');
+});
+
+test('no emojis → null / undefined (nothing served)', () => {
+  assert.equal(AP.extractEmojiTags([{ type: 'Mention' }]), null);
+  assert.equal(AP.timelineEmojis(null), undefined);
+  assert.equal(AP.timelineEmojis('not json'), undefined);
+});