diff --git a/tests/docs-contract.test.mjs b/tests/docs-contract.test.mjs
index 489e3ad5..aee8dc7d 100644
--- a/tests/docs-contract.test.mjs
+++ b/tests/docs-contract.test.mjs
@@ -9,8 +9,19 @@ const docsRoot = join(repoRoot, 'docs');
 
 // Directories sidebars.js renders as `{type: 'autogenerated', dirName: ...}`.
 // Every doc in one of these becomes a sidebar entry, which is labelled from
-// frontmatter `title` when present.
-const AUTOGENERATED_SIDEBAR_DIRS = ['architectures', 'community'];
+// frontmatter `title` when present. The list is derived from sidebars.js
+// rather than restated here so a sidebar added there cannot silently escape
+// the title contract.
+const sidebars = (await import('../sidebars.js')).default;
+
+const AUTOGENERATED_SIDEBAR_DIRS = [
+  ...new Set(
+    Object.values(sidebars)
+      .flat()
+      .filter((entry) => entry?.type === 'autogenerated')
+      .map((entry) => entry.dirName),
+  ),
+].sort();
 
 function walk(dir) {
   return readdirSync(dir, { withFileTypes: true }).flatMap((entry) => {
@@ -158,6 +169,10 @@ test('frontmatter keys are parseable key: value pairs', () => {
 });
 
 test('docs in autogenerated sidebar directories declare a title', () => {
+  assert.ok(
+    AUTOGENERATED_SIDEBAR_DIRS.length > 0,
+    'sidebars.js must declare at least one autogenerated sidebar, otherwise this contract asserts nothing',
+  );
   const untitled = [];
   for (const dir of AUTOGENERATED_SIDEBAR_DIRS) {
     const dirDocs = docs.filter((file) =>