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diff --git a/tools/feed-nav-destination-test.js b/tools/feed-nav-destination-test.js
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+// The Feed destination and the new-posts pill deliberately have different
+// navigation semantics. Keep this small source-level guard beside the fuller
+// browser test for the pill's landing position.
+import assert from 'node:assert/strict';
+
+const source = await Bun.file('src/features/messages.js').text();
+const navStart = source.indexOf("button('feed', t('feedTitle')");
+const navEnd = source.indexOf("button('messages',", navStart);
+const feedButton = source.slice(navStart, navEnd);
+assert(navStart > 0 && navEnd > navStart, 'Feed bottom-nav handler exists');
+assert(feedButton.includes('glideToTop()'), 'Feed bottom-nav button returns to the top');
+assert(!feedButton.includes('jumpToNew()'), 'Feed bottom-nav button does not jump to unread posts');
+
+const pillStart = source.indexOf("class: 'feed-new-pill'");
+const pill = source.slice(pillStart, source.indexOf('})', pillStart) + 2);
+assert(pillStart > 0 && pill.includes('jumpToNew()'), 'new-posts pill jumps to the first unread arrival');
+
+console.log('✓ Feed tab goes to the top; only the new-posts pill jumps to unread posts');