diff --git a/tools/readiness-core/test/index.test.mjs b/tools/readiness-core/test/index.test.mjs
index 812e3d7a..b2367965 100644
--- a/tools/readiness-core/test/index.test.mjs
+++ b/tools/readiness-core/test/index.test.mjs
@@ -34,3 +34,26 @@ test('scanSkillDirectories finds skills in target directory', async () => {
 
   await fs.rm(fixtureDir, { recursive: true, force: true });
 });
+
+test('scanSkillDirectories deduplicates skill names across scanned roots', async () => {
+  // Regression test for double-counting: the same skill installed in two
+  // scanned roots (e.g. .grok/skills/foo and skills/foo) must count once.
+  // Duplicates inflate the Loop Readiness score by flipping the skillsOne
+  // signal to skillsTwoPlus for what is really a single skill.
+  const fixtureDir = path.join(process.cwd(), '.test-fixture-dedup');
+  await fs.rm(fixtureDir, { recursive: true, force: true });
+  await fs.mkdir(path.join(fixtureDir, '.grok', 'skills', 'foo'), { recursive: true });
+  await fs.mkdir(path.join(fixtureDir, 'skills', 'foo'), { recursive: true });
+  await fs.mkdir(path.join(fixtureDir, 'skills', 'bar'), { recursive: true });
+
+  const skills = await scanSkillDirectories(fixtureDir);
+  assert.strictEqual(
+    skills.filter((name) => name === 'foo').length,
+    1,
+    'Same skill name under two roots should count once',
+  );
+  assert.ok(skills.includes('bar'), 'Distinct skill names should still count separately');
+  assert.strictEqual(skills.length, 2, 'Should report exactly foo and bar');
+
+  await fs.rm(fixtureDir, { recursive: true, force: true });
+});