diff --git a/docs/astro.config.mjs b/docs/astro.config.mjs
index 177b5d31..6c68662f 100644
--- a/docs/astro.config.mjs
+++ b/docs/astro.config.mjs
@@ -23,7 +23,11 @@ const typeDocConfig = {
   parametersFormat: 'htmlTable',
   propertyMembersFormat: 'htmlTable',
   disableSources: true,
-  plugin: ['typedoc-plugin-zod'],
+  plugin: [
+    'typedoc-plugin-zod',
+    'typedoc-plugin-frontmatter',
+    './src/plugins/typedoc-frontmatter.js',
+  ],
 };
 
 const plugins = [
diff --git a/docs/package.json b/docs/package.json
index 26e9c84b..e6acfc5c 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -25,6 +25,7 @@
   "devDependencies": {
     "tailwindcss": "^3.3.3",
     "tsx": "^4.19.4",
+    "typedoc-plugin-frontmatter": "^1.3.0",
     "typedoc-plugin-zod": "^1.4.1"
   }
 }
diff --git a/docs/src/plugins/typedoc-frontmatter.js b/docs/src/plugins/typedoc-frontmatter.js
new file mode 100644
index 00000000..3c04a279
--- /dev/null
+++ b/docs/src/plugins/typedoc-frontmatter.js
@@ -0,0 +1,16 @@
+import { MarkdownPageEvent } from 'typedoc-plugin-markdown';
+
+/** @param {import('typedoc-plugin-markdown').MarkdownApplication} app */
+export function load(app) {
+  app.renderer.on(MarkdownPageEvent.BEGIN, (page) => {
+    // page.frontmatter が undefined の場合でも確実に title を入れる
+    page.frontmatter = {
+      ...page.frontmatter,
+      title:
+        page.frontmatter?.title ||
+        page.title ||
+        page.url?.split('/').pop() ||
+        undefined,
+    };
+  });
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index bfe0b6a1..a0fad770 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -111,6 +111,9 @@ importers:
       tsx:
         specifier: ^4.19.4
         version: 4.20.1
+      typedoc-plugin-frontmatter:
+        specifier: ^1.3.0
+        version: 1.3.0(typedoc-plugin-markdown@4.8.1(typedoc@0.28.5(typescript@5.8.3)))
       typedoc-plugin-zod:
         specifier: ^1.4.1
         version: 1.4.1(typedoc@0.28.5(typescript@5.8.3))
@@ -5964,6 +5967,11 @@ packages:
     resolution: {integrity: sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==}
     engines: {node: '>= 0.6'}
 
+  typedoc-plugin-frontmatter@1.3.0:
+    resolution: {integrity: sha512-xYQFMAecMlsRUjmf9oM/Sq2FVz4zlgcbIeVFNLdO118CHTN06gIKJNSlyExh9+Xl8sK0YhIvoQwViUURxritWA==}
+    peerDependencies:
+      typedoc-plugin-markdown: '>=4.5.0'
+
   typedoc-plugin-markdown@4.8.1:
     resolution: {integrity: sha512-ug7fc4j0SiJxSwBGLncpSo8tLvrT9VONvPUQqQDTKPxCoFQBADLli832RGPtj6sfSVJebNSrHZQRUdEryYH/7g==}
     engines: {node: '>= 18'}
@@ -12599,6 +12607,11 @@ snapshots:
       media-typer: 1.1.0
       mime-types: 3.0.1
 
+  typedoc-plugin-frontmatter@1.3.0(typedoc-plugin-markdown@4.8.1(typedoc@0.28.5(typescript@5.8.3))):
+    dependencies:
+      typedoc-plugin-markdown: 4.8.1(typedoc@0.28.5(typescript@5.8.3))
+      yaml: 2.7.1
+
   typedoc-plugin-markdown@4.8.1(typedoc@0.28.5(typescript@5.8.3)):
     dependencies:
       typedoc: 0.28.5(typescript@5.8.3)