AI: address review on PR #477

Refs #454

## Automated implementation (requires human review)
[SidebarComponent.tsx](frontend/src/components/layout/SidebarComponent.tsx) の1行を修正しました。`overflow-y-auto` を `md` 以上に限定し、スマホでサゼストがサイドバーの領域外で切られる原因を取り除きました。

差分を確認済みです。指定に従い、テスト・lint・ビルドは未実行です。実画面でのスマホ表示とPC表示の確認も未実施です。

## Automated review (not a guarantee of correctness)
```text
The change restricts sidebar scrolling to medium and larger viewports. No actionable regression was identified in the current diff.

```

## Verification
- Tests/builds/migrations were not authorized and were not invoked by the controller.
- Codex was instructed not to run them; its command transcript should be inspected.
- Do not merge before manual acceptance and required checks.

---------

Co-authored-by: Codex Night Worker <codex-night@localhost>
Reviewed-on: #456
Co-authored-by: テツノニジカ <969+codex-bot@noreply.localhost>

backend/app/controllers/tag_descriptions_controller.rb

@@ -1,4 +1,34 @@
 class TagDescriptionsController < ApplicationController
+  rescue_from TagDescriptionOperation::Conflict, with: :render_conflict
+
+  def index
+    locale = resolve_locale!
+    descriptions = HistoryAccess.current(TagDescription.all, TagDescriptionVersion)
+        .where(language_code: locale.language_code).includes(tag: :tag_names)
+        .order(updated_at: :desc, id: :asc)
+    title = params[:title].to_s.strip
+    if title.present?
+      pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
+      descriptions = descriptions.joins(tag: :tag_names)
+          .where(tag_names: { language_code: locale.language_code, primary_flg: true })
+          .where('tag_names.name LIKE ?', pattern).limit(20)
+    end
+    render json: descriptions.map { WikiPageRepr.tag_description(locale, _1) }
+  end
+
+  def show_by_id
+    locale = resolve_locale!
+    reference = TagDescription.find_by(id: params[:description_id])
+    return head :not_found unless reference
+
+    HistoryAccess.require_current!(reference, TagDescriptionVersion)
+    description = TagDescription.find_by(tag_id: reference.tag_id,
+                                         language_code: locale.language_code)
+    return head :not_found unless description
+
+    render json: representation(description)
+  end
+
   def show
     locale = resolve_locale!
     description = TagDescription.find_by(tag_id: params[:id], language_code: locale.language_code)
@@ -18,6 +48,25 @@ class TagDescriptionsController < ApplicationController
     render json: representation(description)
   end
 
+  def create
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
+
+    locale = resolve_locale!
+    title = params[:title].to_s.strip
+    body = params[:body].to_s
+    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
+    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return render_unprocessable_entity field: :title if title.include?(':')
+
+    tag_name = TagName.find_by(language_code: locale.language_code, name: title)
+    return render_unprocessable_entity field: :title unless tag_name&.tag
+
+    description = TagDescriptionOperation.create!(
+        locale, tag: tag_name.tag, body:, created_by_user: current_user)
+    render json: representation(description), status: :created
+  end
+
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -32,7 +81,9 @@ class TagDescriptionsController < ApplicationController
     description = TagDescription.find_by(tag:, language_code: locale.language_code)
 
     if description
-      TagDescriptionOperation.update!(locale, tag:, body:, updated_by_user: current_user)
+      TagDescriptionOperation.update_with_title!(
+          locale, tag:, body:, title: params[:title], actor: current_user,
+          base_revision_id: params[:base_revision_id].presence)
       description.reload
       render json: representation(description)
     else
@@ -48,8 +99,20 @@ class TagDescriptionsController < ApplicationController
 
   private
 
+  def render_conflict error
+    render json: { error: 'conflict', message: error.message }, status: :conflict
+  end
+
   def representation description
     HistoryAccess.require_current!(description, TagDescriptionVersion)
+    if params[:document] == '1'
+      locale = resolve_locale!
+      version = HistoryAccess.visible(TagDescriptionVersion.all).find_by!(
+          tag_id: description.tag_id, language_code: description.language_code,
+          version_no: description.version_no)
+      return WikiPageRepr.tag_description(locale, description).merge(revision_id: version.id)
+    end
+
     description.as_json(only: [
         :tag_id,
         :language_code,

backend/app/controllers/tag_groups_controller.rb

@@ -1,7 +1,22 @@
 class TagGroupsController < ApplicationController
+  rescue_from TagGroupMarkdownParser::InvalidDocument,
+              TagGroupMarkdownRenderer::UnsupportedStructure, with: :render_document_error
+
   def index
     locale = resolve_locale!
-    groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).includes(:created_by_user, :updated_by_user).order(:id)
+    groups = HistoryAccess.current(TagGroup.all, TagGroupVersion)
+        .includes(:created_by_user, :updated_by_user)
+    if params[:document] == '1'
+      groups = groups.order(updated_at: :desc, id: :asc)
+      title = params[:title].to_s.strip
+      if title.present?
+        pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
+        groups = groups.where('CONCAT(?, name) LIKE ? OR CONCAT(?, name) LIKE ?',
+                              TagGroupRepr::PREFIX, pattern, 'tag_group:', pattern).limit(20)
+      end
+      return render json: groups.map { WikiPageRepr.tag_group(_1) }
+    end
+    groups = groups.order(:id)
     render json: TagGroupRepr.many(locale, groups.to_a)
   end
 
@@ -10,7 +25,15 @@ class TagGroupsController < ApplicationController
     group = TagGroup.includes(:created_by_user, :updated_by_user).find_by(id: params[:id])
     return head :not_found unless group
 
-    render json: TagGroupRepr.one(locale, group)
+    render json: representation(locale, group)
+  end
+
+  def show_by_name
+    locale = resolve_locale!
+    group = TagGroup.includes(:created_by_user, :updated_by_user).find_by(name: params[:name])
+    return head :not_found unless group
+
+    render json: representation(locale, group)
   end
 
   def create
@@ -18,8 +41,8 @@ class TagGroupsController < ApplicationController
     return head :forbidden unless current_user.gte_member?
 
     locale = resolve_locale!
-    group = TagGroupOperation.create!(locale, **write_attributes, actor: current_user)
+    group = TagGroupOperation.create!(locale, **write_attributes(locale), actor: current_user)
-    render json: TagGroupRepr.one(locale, group), status: :created
+    render json: representation(locale, group), status: :created
   end
 
   def update
@@ -30,13 +53,39 @@ class TagGroupsController < ApplicationController
     group = TagGroup.find_by(id: params[:id])
     return head :not_found unless group
 
-    TagGroupOperation.update!(locale, group:, **write_attributes, actor: current_user)
+    TagGroupOperation.update!(locale, group:, **write_attributes(locale, group:), actor: current_user)
-    render json: TagGroupRepr.one(locale, group.reload)
+    render json: representation(locale, group.reload)
   end
 
   private
 
-  def write_attributes
+  def render_document_error error
+    render_unprocessable_entity(error.message)
+  end
+
+  def representation locale, group
+    representation = TagGroupRepr.one(locale, group)
+    return representation unless params[:document] == '1'
+
+    version = TagGroupRepr.current_version(group)
+    raise ActiveRecord::RecordNotFound unless version
+
+    TagGroupRepr.document(representation, version)
+  end
+
+  def write_attributes locale, group: nil
+    if params.key?(:body)
+      body = params[:body].to_s
+      if body.blank?
+        group ||= TagGroup.new
+        group.errors.add(:body, :blank)
+        raise ActiveRecord::RecordInvalid, group
+      end
+      parsed = TagGroupMarkdownParser.parse(locale, body:, group:)
+      return parsed.except(:compatibility_body).merge(
+          name: params[:name], require_compatibility: true)
+    end
+
     { name: params[:name], description: params[:description],
       members: params[:members], placements: params[:placements] }
   end

backend/app/controllers/wiki_pages_controller.rb

@@ -6,6 +6,11 @@ class WikiPagesController < ApplicationController
   def index
     locale = resolve_locale!
 
+    resource_type = params[:resource_type]
+    unless resource_type.nil? || ['tag_description', 'tag_group'].include?(resource_type)
+      return head :bad_request
+    end
+
     title = params[:title].to_s.strip
     descriptions =
         HistoryAccess.current(TagDescription.all, TagDescriptionVersion)
@@ -14,6 +19,8 @@ class WikiPagesController < ApplicationController
 
     descriptions = descriptions.order(updated_at: :desc, id: :asc)
     tag_groups = HistoryAccess.current(TagGroup.all, TagGroupVersion).order(updated_at: :desc, id: :asc)
+    descriptions = descriptions.none if resource_type == 'tag_group'
+    tag_groups = tag_groups.none if resource_type == 'tag_description'
     if title.present?
       pattern = "%#{ ApplicationRecord.sanitize_sql_like(title) }%"
       descriptions =
@@ -246,25 +253,8 @@ class WikiPagesController < ApplicationController
 
     base_revision_id = params[:base_revision_id].presence
 
-    ApplicationRecord.transaction do
+    TagDescriptionOperation.update_with_title!(
-      SharedResourceIdAllocator.lock_space!(Tag, 'tags')
+        locale, tag:, body:, title:, actor: current_user, base_revision_id:)
-      tag.lock!
-      old_title = tag_name.name
-      if title != old_title
-        TagVersioning.ensure_snapshot!(tag, created_by_user: current_user)
-      end
-
-      tag_name.update!(name: title) if title != old_title
-
-      message = params[:message].presence
-      TagDescriptionOperation.update!(locale, tag:, body:, updated_by_user: current_user,
-                                      message:, base_revision_id:)
-
-      if title != old_title
-        tag.reload
-        TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: current_user)
-      end
-    end
 
     head :ok
   rescue ActiveRecord::RecordInvalid => e
@@ -326,21 +316,9 @@ class WikiPagesController < ApplicationController
   end
 
   def render_group_representation representation, version, body: nil, status: :ok
-    body ||= TagGroupMarkdownRenderer.render(representation)
+    document = TagGroupRepr.document(representation, version)
-    versions = HistoryAccess.visible(TagGroupVersion.all).where(tag_group_id: version.tag_group_id)
+    document['body'] = body if body
-    pred = versions.find_by(version_no: version.version_no - 1)&.id
+    render json: document, status:
-    succ = versions.find_by(version_no: version.version_no + 1)&.id
-    updated_at = version.created_at
-    render json: {
-        'id' => version.tag_group_id,
-        'resource_type' => 'tag_group',
-        'title' => "#{ TagGroupRepr::PREFIX }#{ representation.fetch('name') }",
-        'deprecated_at' => nil,
-        'body' => body,
-        'revision_id' => version.id,
-        'pred' => pred,
-        'succ' => succ,
-        'updated_at' => updated_at }, status:
   rescue TagGroupMarkdownRenderer::UnsupportedStructure => error
     render_unprocessable_entity(error.message)
   end

backend/app/representations/tag_group_repr.rb

@@ -56,6 +56,21 @@ module TagGroupRepr
       'updated_at' => wiki_page.updated_at }
   end
 
+  def document representation, version
+    HistoryAccess.require!(version)
+    versions = HistoryAccess.visible(TagGroupVersion.all)
+        .where(tag_group_id: version.tag_group_id)
+    { 'id' => version.tag_group_id,
+      'resource_type' => 'tag_group',
+      'title' => "#{ PREFIX }#{ representation.fetch('name') }",
+      'deprecated_at' => nil,
+      'body' => TagGroupMarkdownRenderer.render(representation),
+      'revision_id' => version.id,
+      'pred' => versions.find_by(version_no: version.version_no - 1)&.id,
+      'succ' => versions.find_by(version_no: version.version_no + 1)&.id,
+      'updated_at' => version.created_at }
+  end
+
   def current_version group
     HistoryAccess.visible(TagGroupVersion.all).find_by(tag_group_id: group.id, version_no: group.version_no)
   end

backend/app/services/tag_description_operation.rb

@@ -37,6 +37,37 @@ class TagDescriptionOperation
     end
   end
 
+  def self.update_with_title! locale, tag:, body:, title:, actor:, base_revision_id: nil
+    return update!(locale, tag:, body:, updated_by_user: actor,
+                   base_revision_id:) if title.nil?
+
+    title = title.to_s.strip
+    tag_name = tag.tag_name(locale.language_code)
+    if title.blank? || title.include?(':') || !tag_name || tag_name.name.include?(':')
+      tag.errors.add(:title, :invalid)
+      raise ActiveRecord::RecordInvalid, tag
+    end
+
+    ApplicationRecord.transaction do
+      SharedResourceIdAllocator.lock_space!(Tag, 'tags')
+      tag.lock!
+      old_title = tag_name.name
+      if title != old_title
+        TagVersioning.ensure_snapshot!(tag, created_by_user: actor)
+      end
+
+      tag_name.update!(name: title) if title != old_title
+
+      update!(locale, tag:, body:, updated_by_user: actor,
+              base_revision_id:)
+
+      if title != old_title
+        tag.reload
+        TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: actor)
+      end
+    end
+  end
+
   def self.record_version! description:, body:, user:
     creating = description.new_record?
     version_no = creating ? 1 : description.version_no + 1

backend/config/routes.rb

@@ -17,7 +17,11 @@ Rails.application.routes.draw do
   resources :locales, only: [:index]
   resources :sitemap_entries, only: [:index, :show], param: :resource
 
-  resources :tag_groups, only: [:index, :show, :create, :update]
+  resources :tag_groups, only: [:index, :show, :create, :update] do
+    collection do
+      get 'name/:name', action: :show_by_name
+    end
+  end
 
   resources :nico_tags, path: 'tags/nico', only: [:index, :show, :update]
 
@@ -28,6 +32,9 @@ Rails.application.routes.draw do
 
   resources :tags, only: [:index, :show] do
     collection do
+      get :descriptions, to: 'tag_descriptions#index'
+      post :descriptions, to: 'tag_descriptions#create'
+      get 'descriptions/:description_id', to: 'tag_descriptions#show_by_id'
       get :autocomplete
       get :'with-depth', action: :with_depth
       get :versions, to: 'tag_versions#index'

frontend/src/App.tsx

@@ -166,7 +166,12 @@ export const pageRoutes = (
 	    robots: 'noindex', authentication: 'user' } },
 	{ path: ':id', element: <MaterialDetailPage/>,
 	  handle: { preload: MaterialDetailPage.preload, sitemap: ['materials'] } }] },
-    { path: 'wiki', element: <WikiSearchPage/>,
+    { path: 'wiki', element: <LocaleRedirect to="/tags"/>,
+      handle: { redirectTo: '/tags' } },
+    { path: 'tag-descriptions', element: <LocaleRedirect to="/tags"/>,
+      handle: { redirectTo: '/tags' } },
+    { path: 'tag-groups',
+      element: <WikiSearchPage key="tag_group" resourceType="tag_group"/>,
       handle: { preload: WikiSearchPage.preload, sitemap: ['static'] } },
     { path: 'wiki/:title', element: <WikiDetailPage/>,
       handle: { preload: WikiDetailPage.preload, switchLocale: switchWikiLocale,

frontend/src/components/TagDetailSidebar.test.tsx

@@ -39,18 +39,6 @@ describe ('TagDetailSidebar', () => {
     vi.clearAllMocks ()
   })
 
-  it ('inherits the sidebar width saved by the post list', () => {
-    localStorage.setItem ('sidebar:posts-index-tags:left:width', '320')
-
-    const { container } = renderWithProviders (
-	<TagDetailSidebar post={buildPost ()}/>)
-    const sidebar = container.querySelector<HTMLElement> (
-	'[style*="--sidebar-width"]')
-
-    expect (sidebar).toBeInTheDocument ()
-    expect (sidebar?.style.getPropertyValue ('--sidebar-width')).toBe ('320px')
-  })
-
   it ('keeps internal and external tags with the same numeric id in flat mode', () => {
     setClientTagRelationDisplayMode ('flat')
 

frontend/src/components/TagDetailSidebar.tsx

@@ -378,7 +378,7 @@ const TagDetailSidebar: FC<Props> = ({ className, post, sp }) => {
   }, [baseTags])
 
   return (
-      <SidebarComponent sidebarKey="posts-index-tags" className={className}>
+      <SidebarComponent sidebarKey="post-detail-tags" className={className}>
 	<TagSearch/>
 	<DndContext
 	    sensors={sensors}

frontend/src/components/TopNav.tsx

@@ -29,7 +29,7 @@ import { fetchWikiPage } from '@/lib/wiki'
 import type { FC, MouseEvent } from 'react'
 
 import type { AvailableLocale, LocaleCode } from '@/lib/locales'
-import type { Material, Menu, MenuVisibleItem, Tag, User } from '@/types'
+import type { Material, Menu, MenuVisibleItem, Tag, User, WikiPage } from '@/types'
 
 type Props = {
     user: User | null
@@ -39,10 +39,11 @@ type NavDensity = 'auto' | 'comfortable' | 'compact'
 
 
 export const menuOutline = (
-    { tag, material, wikiId, user, pathName: fullPathname }: {
+    { tag, material, wikiId, wikiResourceType, user, pathName: fullPathname }: {
 	tag?: Tag | null
 	material?: Material | null
 	wikiId: number | null
+	wikiResourceType?: WikiPage['resourceType']
 	user: User | null
 	pathName: string },
 ): Menu => {
@@ -99,17 +100,29 @@ export const menuOutline = (
 	    visible: materialFlg && Boolean (material?.tag) },
 	  { ...message ('history'), to: `/materials/changes?material_id=${ material?.id }`,
 	    visible: materialFlg }] },
-      { ...message ('wiki'), to: '/wiki', subMenu: [
+      ...([
-	  { ...message ('search'), to: '/wiki' },
+	  { key: 'tagGroups', path: '/tag-groups', type: 'tag_group' }] as const)
-	  { ...message ('create'), to: '/wiki/new', visible: editable },
+	  .map (({ key, path, type }): MenuVisibleItem => {
+	    const current = (wikiResourceType ?? 'tag_description') === type
+	    const detailFlg = wikiPageFlg && current
+	    const creationPath =
+		type === 'tag_group'
+		? `/wiki/new?title=${ encodeURIComponent ('タググループ:') }` : '/wiki/new'
+	    return { ...message (key), to: path,
+		base: (pathName.startsWith ('/wiki') && current) ? '/wiki' : path,
+		subMenu: [
+		    { ...message ('search'), to: path },
+		    { ...message ('create'), to: creationPath, visible: editable },
 		    { ...message ('allHistory'), to: '/wiki/changes' },
 		    { ...message ('help'), to: '/wiki/ヘルプ:Wiki' },
-	  { component: <Separator/>, visible: wikiPageFlg },
+		    { component: <Separator/>, visible: detailFlg },
-	  { ...message ('postsWithCount', { count: postCount }), to: `/posts?tags=${ wikiTitle }`,
+		    { ...message ('postsWithCount', { count: postCount }),
-	    visible: wikiPageFlg },
+		      to: `/posts?tags=${ wikiTitle }`, visible: detailFlg },
-	  { ...message ('history'), to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
+		    { ...message ('history'), to: `/wiki/changes?id=${ wikiId }`,
+		      visible: detailFlg },
 		    { ...message ('edit'), to: `/wiki/${ wikiId || wikiTitle }/edit`,
-	    visible: wikiPageFlg && editable }] },
+		      visible: detailFlg && editable }] }
+	  }),
       { ...message ('help'), to: '/help/home', base: '/help', subMenu: [
 	  { ...message ('search'), to: '/help' },
 	  { ...message ('allHistory'), to: '/help/changes' },
@@ -229,7 +242,8 @@ const TopNav: FC<Props> = ({ user, locales, resolveLocaleSwitch }) => {
       queryKey: materialsKeys.show (effectiveTitle, locale),
       queryFn: () => fetchMaterial (effectiveTitle, locale) })
 
-  const menu = menuOutline ({ tag, material, wikiId, user, pathName: location.pathname })
+  const menu = menuOutline ({ tag, material, wikiId,
+      wikiResourceType: wikiPage?.resourceType, user, pathName: location.pathname })
   const visibleMenu = menu.filter ((item): item is MenuVisibleItem => item.visible ?? true)
   const menuLabels = visibleMenu.map (item => item.name).join ('\u0000')
   const moreMenu = menu.filter (item =>

frontend/src/components/layout/SidebarComponent.test.tsx

@@ -70,6 +70,16 @@ describe ('SidebarComponent', () => {
     vi.spyOn (HTMLElement.prototype, 'hasPointerCapture').mockReturnValue (true)
   })
 
+  it ('limits sidebar scrolling to desktop to avoid clipping mobile suggestions', () => {
+    renderSidebar ()
+
+    // jsdom has no layout; guard the responsive classes responsible for clipping.
+    const sidebar = screen.getByText ('Sidebar body')
+
+    expect (sidebar).not.toHaveClass ('overflow-y-auto')
+    expect (sidebar).toHaveClass ('md:overflow-y-auto')
+  })
+
   it ('uses maxWidth without applying the container main-width reserve twice', async () => {
     localStorage.setItem ('sidebar:test-sidebar:left:width', '700')
     const onWidthChange = vi.fn ()

frontend/src/components/layout/SidebarComponent.tsx

@@ -339,7 +339,7 @@ const SidebarComponent: FC<Props> = ({
 	  </style>
 	</Helmet>
 
-	<div className="h-full overflow-y-auto p-4 sidebar">
+	<div className="h-full md:overflow-y-auto p-4 sidebar">
 	  {children}
 	</div>
 

frontend/src/lib/prefetchers.ts

@@ -100,10 +100,11 @@ const prefetchHelpDiff: Prefetcher = async (qc, url, locale) => {
 
 const prefetchWikiPagesIndex: Prefetcher = async (qc, url, locale) => {
   const title = url.searchParams.get ('title') ?? ''
+  const resourceType = 'tag_group'
 
   await qc.prefetchQuery ({
-      queryKey: wikiKeys.index ({ title }, locale),
+      queryKey: wikiKeys.index ({ title, resourceType }, locale),
-      queryFn:  () => fetchWikiPages ({ title }, locale) })
+      queryFn: () => fetchWikiPages ({ title, resourceType }, locale) })
 }
 
 
@@ -310,7 +311,8 @@ export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[]
 		  && Boolean (mPost (u.pathname))),
       run: prefetchPostShow },
     { test: u => u.pathname === '/posts/changes', run: prefetchPostChanges },
-    { test: u => u.pathname === '/wiki', run: prefetchWikiPagesIndex },
+    { test: u => u.pathname === '/tag-groups',
+      run: prefetchWikiPagesIndex },
     { test: u => (!(['/wiki/new', '/wiki/changes'].includes (u.pathname))
 		  && Boolean (mWiki (u.pathname))),
       run: prefetchWikiPageShow },

frontend/src/lib/queryKeys.ts

@@ -5,6 +5,7 @@ import type {
     FetchPostsParams,
     FetchTagsParams,
     MaterialFilter,
+    WikiPage,
     WikiTagReference } from '@/types'
 
 export const localesKeys = {
@@ -130,7 +131,7 @@ export const wikiKeys = {
     autolinkCandidates: (language: string, locale: LocaleCode) =>
 	['wiki', 'autolink', locale, language] as const,
     index:  (
-    p: { title?: string },
+    p: { title?: string, resourceType?: WikiPage['resourceType'] },
     locale: LocaleCode = 'ja',
 ) => ['wiki', locale, 'index', p] as const,
     show:   (

frontend/src/lib/wiki.ts

@@ -1,6 +1,6 @@
 import { isAxiosError } from 'axios'
 
-import { apiGet } from '@/lib/api'
+import { apiGet, apiPost, apiPut } from '@/lib/api'
 import { switchLocalePath } from '@/lib/locales'
 import { fetchTag, fetchTagByName } from '@/lib/tags'
 
@@ -24,19 +24,54 @@ export const fetchWikiChanges = (
 
 
 export const fetchWikiPages = async (
-    { title }:  { title?: string },
+    { title, resourceType = 'tag_description' }: {
+	title?: string, resourceType?: WikiPage['resourceType'] },
     locale: LocaleCode = 'ja',
-): Promise<WikiPage[]> =>
+): Promise<WikiPage[]> => apiGet (
-    await apiGet ('/wiki', { locale, params: { title } })
+    resourceType === 'tag_group' ? '/tag_groups' : '/tags/descriptions',
+    { locale, params: { title, document: '1' } })
 
 
 export const fetchWikiPage = async (
     id: string,
     { version }: { version?: string },
     locale: LocaleCode = 'ja',
-): Promise<WikiPage> =>
+): Promise<WikiPage> => {
-    await apiGet (`/wiki/${ encodeURIComponent (id) }`, {
+  if (version != null)
-	locale, params: version ? { version } : { } })
+    return apiGet (`/wiki/${encodeURIComponent (id)}`, { locale, params: { version } })
+  try
+  {
+    return await apiGet (`/tags/descriptions/${encodeURIComponent (id)}`,
+	{ locale, params: { document: '1' } })
+  }
+  catch (error)
+  {
+    if (!isAxiosError (error) || error.response?.status !== 404)
+      throw error
+    return apiGet (`/tag_groups/${encodeURIComponent (id)}`,
+	{ locale, params: { document: '1' } })
+  }
+}
+
+
+export const saveTagDocument = async (
+    { title, body, page }: { title: string, body: string, page?: WikiPage },
+    locale: LocaleCode,
+): Promise<WikiPage> => {
+  const groupName = /^(?:タググループ:|tag_group:)(.*)$/i.exec (title.trim ())?.[1]
+  const options = { locale, params: { document: '1' } }
+  if (page?.resourceType === 'tag_group' || (page == null && groupName != null))
+  {
+    const attributes = { name: groupName ?? title.trim (), body }
+    return page == null
+	? apiPost ('/tag_groups', attributes, options)
+	: apiPut (`/tag_groups/${encodeURIComponent (String (page.id))}`, attributes, options)
+  }
+  if (page == null)
+    return apiPost ('/tags/descriptions', { title, body }, options)
+  return apiPut (`/tags/${encodeURIComponent (String (page.tagId))}/description`,
+      { title, body }, options)
+}
 
 
 export const fetchWikiPageByTitle = async (
@@ -46,7 +81,14 @@ export const fetchWikiPageByTitle = async (
 ): Promise<WikiPage | null> => {
   try
   {
-    return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { locale, params: { version } })
+    if (version != null)
+      return await apiGet (`/wiki/title/${encodeURIComponent (title)}`,
+	  { locale, params: { version } })
+    const groupName = /^(?:タググループ:|tag_group:)(.*)$/i.exec (title.trim ())?.[1]
+    const path = groupName == null
+	? `/tags/name/${encodeURIComponent (title)}/description`
+	: `/tag_groups/name/${encodeURIComponent (groupName)}`
+    return await apiGet (path, { locale, params: { document: '1' } })
   }
   catch (error)
   {
@@ -72,7 +114,7 @@ export const fetchWikiPageByReference = async (
   {
     if (!isAxiosError (error) || error.response?.status !== 404)
       throw error
-    const tag = await fetchWikiTag ({ wikiId: reference }, locale)
+    const tag = await fetchTagByName (reference, locale)
     return tag == null ? null : fetchWikiPageByTitle (tag.name, params, locale)
   }
 }
@@ -86,7 +128,9 @@ export const fetchWikiTag = async (
     return fetchTagByName (reference.name, locale)
   try
   {
-    return await apiGet (`/wiki/${encodeURIComponent (reference.wikiId)}/tag`, { locale })
+    const page = await fetchWikiPage (reference.wikiId, { }, locale)
+    return (page.resourceType === 'tag_description' && page.tagId != null)
+	? fetchTag (String (page.tagId), locale) : null
   }
   catch (error)
   {

frontend/src/locales/ain-Kana/navigation.json

@@ -14,6 +14,8 @@
   "materials": "チカㇻペ",
   "suppressions": "アエアイカㇷ゚テㇷ゚",
   "wiki": "Wiki",
+  "tagDescriptions": "$t(counts:resources.tag_descriptions)",
+  "tagGroups": "$t(counts:resources.tag_groups)",
   "create": "アシㇼ",
   "edit": "イヌイェㇷ゚",
   "entertainment": "シノッ",

frontend/src/locales/ja/navigation.json

@@ -13,6 +13,8 @@
   "materials": "素材",
   "suppressions": "抑止",
   "wiki": "Wiki",
+  "tagDescriptions": "$t(counts:resources.tag_descriptions)",
+  "tagGroups": "$t(counts:resources.tag_groups)",
   "create": "新規",
   "edit": "編輯",
   "entertainment": "おたのしみ",

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -135,7 +135,7 @@ const MaterialDetailPage: FC = () => {
 
 	      <TabGroup>
 		{material.tag && (
-		    <Tab name={label ('navigation:wiki')}>
+		    <Tab name={label ('navigation:tagDescriptions')}>
 		      <WikiBody
 			  title={material.tag.name}
 			  language={localeLanguage (locale)}

frontend/src/pages/posts/PostListPage.tsx

@@ -176,7 +176,7 @@ const PostListPage: FC = () => {
 	      {loading && label ('common:loading')}
 	    </Tab>
 	    {tags.length === 1 && (
-		<Tab name={label ('navigation:wiki')}>
+		<Tab name={label ('navigation:tagDescriptions')}>
 		  <WikiBody title={tags[0]} body={wikiPage?.body}
 		      language={wikiPage?.languageCode ?? (wikiPage?.resourceType === 'tag_description'
 			  ? localeLanguage (locale) : 'und')}/>

frontend/src/pages/tags/TagDetailPage.test.tsx

@@ -35,6 +35,10 @@ const renderPage = () =>
 describe ('TagDetailPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
+    tagsApi.fetchTag.mockReset ()
+    api.apiPut.mockReset ()
+    api.isApiError.mockReset ()
+    toastApi.toast.mockReset ()
     api.isApiError.mockReturnValue (false)
   })
 
@@ -51,8 +55,11 @@ describe ('TagDetailPage', () => {
   })
 
   it ('submits edited tag fields', async () => {
-    tagsApi.fetchTag.mockResolvedValueOnce (buildTag ({ id: 7, name: 'old' }))
+    const updatedTag = buildTag ({ id: 7, name: 'new', aliases: ['alias'] })
-    api.apiPut.mockResolvedValueOnce (buildTag ({ id: 7, name: 'new', aliases: ['alias'] }))
+    tagsApi.fetchTag
+	.mockResolvedValue (updatedTag)
+	.mockResolvedValueOnce (buildTag ({ id: 7, name: 'old' }))
+    api.apiPut.mockResolvedValueOnce (updatedTag)
 
     renderPage ()
 

frontend/src/pages/wiki/WikiDetailPage.tsx

@@ -51,7 +51,8 @@ const WikiDetailPage: FC = () => {
       queryKey: helpKeys.titles ('ja'),
       queryFn: () => getHelpTitleIndex ('ja'),
       staleTime: Infinity })
-  const lookupTitle = title.trim ().normalize ('NFKC').toLowerCase ().replace (/^ヘルプ:/, '')
+  const lookupTitle = title.trim ().normalize ('NFKC').toLowerCase ()
+      .replace (/^(?:ヘルプ|手引):/, '')
   const identifiers = useMemo (() => (
       (titleIndex != null && Object.hasOwn (titleIndex, lookupTitle))
       ? titleIndex[lookupTitle] : []), [titleIndex, lookupTitle])

frontend/src/pages/wiki/WikiEditPage.tsx

@@ -11,8 +11,8 @@ import FormField from '@/components/common/FormField'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
 import PageHead from '@/components/common/PageHead'
-import { apiGet, apiPut } from '@/lib/api'
+import { fetchWikiPage, saveTagDocument } from '@/lib/wiki'
-import { wikiKeys } from '@/lib/queryKeys'
+import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { canEditContent } from '@/lib/users'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
@@ -33,7 +33,7 @@ const FIXED_WIKI_EDITOR_VIEW = { menu: true, md: true, html: true } as const
 
 type Props = { user: User | null }
 
-type WikiFormField = 'title' | 'body'
+type WikiFormField = 'title' | 'name' | 'body'
 
 
 const WikiEditPage: FC<Props> = ({ user }) => {
@@ -50,7 +50,7 @@ const WikiEditPage: FC<Props> = ({ user }) => {
   const source = `${locale}:${id}`
   const { data: wiki, isPending: loading } = useQuery ({
       queryKey: wikiKeys.show (id ?? '', { }, locale),
-      queryFn: () => apiGet<WikiPage> (`/wiki/${ encodeURIComponent (id ?? '') }`, { locale }),
+      queryFn: () => fetchWikiPage (id ?? '', { }, locale),
       enabled: editable })
   const [body, setBody] = useState (wiki?.body ?? '')
   const [loadedSource, setLoadedSource] = useState (wiki == null ? '' : source)
@@ -60,22 +60,19 @@ const WikiEditPage: FC<Props> = ({ user }) => {
       useValidationErrors<WikiFormField> ()
 
   const handleSubmit = async () => {
-    if (pending || !editable)
+    if (pending || !editable || wiki == null)
       return
     clearValidationErrors ()
 
-    const formData = new FormData ()
-    formData.append ('title', title)
-    formData.append ('body', body)
-
     try
     {
-      await apiPut (`/wiki/${ id }`, formData,
+      await saveTagDocument ({ title, body, page: wiki }, locale)
-		    { locale, headers: { 'Content-Type': 'multipart/form-data' } })
       qc.setQueryData (wikiKeys.show (title, { }, locale),
 		       (prev: WikiPage | undefined) =>
 			   prev == null ? prev : { ...prev, title, body })
-      qc.invalidateQueries ({ queryKey: wikiKeys.root })
+      await Promise.all ([
+	  qc.invalidateQueries ({ queryKey: wikiKeys.root }),
+	  qc.invalidateQueries ({ queryKey: tagsKeys.root })])
       toast ({ title: label ('shared:messages.postSuccess') })
       navigate (`/wiki/${ encodeURIComponent (title) }`)
     }
@@ -110,7 +107,7 @@ const WikiEditPage: FC<Props> = ({ user }) => {
 
 		{/* タイトル */}
 		{/* TODO: タグ補完 */}
-		<FormField label={label ('shared:labels.title')} messages={fieldErrors.title}>
+		<FormField label={label ('shared:labels.title')} messages={fieldErrors.title ?? fieldErrors.name}>
 		  {({ describedBy, invalid }) => (
 		      <input type="text"
 			     value={title}

frontend/src/pages/wiki/WikiNewPage.tsx

@@ -12,7 +12,7 @@ import FormField from '@/components/common/FormField'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
 import PageHead from '@/components/common/PageHead'
-import { apiPost } from '@/lib/api'
+import { saveTagDocument } from '@/lib/wiki'
 import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { canEditContent } from '@/lib/users'
 import { inputClass } from '@/lib/utils'
@@ -21,7 +21,7 @@ import Forbidden from '@/pages/Forbidden'
 
 import type { FC } from 'react'
 
-import type { User, WikiPage } from '@/types'
+import type { User } from '@/types'
 
 const mdParser = new MarkdownIt
 const FIXED_WIKI_EDITOR_VIEW = { menu: true, md: true, html: true } as const
@@ -32,7 +32,7 @@ const FIXED_WIKI_EDITOR_VIEW = { menu: true, md: true, html: true } as const
 
 type Props = { user: User | null }
 
-type WikiFormField = 'title' | 'body'
+type WikiFormField = 'title' | 'name' | 'body'
 
 
 const WikiNewPage: FC<Props> = ({ user }) => {
@@ -55,14 +55,9 @@ const WikiNewPage: FC<Props> = ({ user }) => {
   const handleSubmit = async () => {
     clearValidationErrors ()
 
-    const formData = new FormData
-    formData.append ('title', title)
-    formData.append ('body', body)
-
     try
     {
-      const data = await apiPost<WikiPage> ('/wiki', formData,
+      const data = await saveTagDocument ({ title, body }, locale)
-				  { locale, headers: { 'Content-Type': 'multipart/form-data' } })
       await qc.cancelQueries ({ queryKey: wikiKeys.root })
       qc.setQueryData (wikiKeys.show (data.title, { }, locale), data)
       await Promise.all ([
@@ -91,7 +86,7 @@ const WikiNewPage: FC<Props> = ({ user }) => {
 
 	  {/* タイトル */}
 	  {/* TODO: タグ補完 */}
-	  <FormField label={label ('shared:labels.title')} messages={fieldErrors.title}>
+	  <FormField label={label ('shared:labels.title')} messages={fieldErrors.title ?? fieldErrors.name}>
 	    {({ describedBy, invalid }) => (
 		<input type="text"
 		       value={title}

frontend/src/pages/wiki/WikiSearchPage.tsx

@@ -8,7 +8,7 @@ import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import PageHead from '@/components/common/PageHead'
-import { apiGet } from '@/lib/api'
+import { fetchWikiPages } from '@/lib/wiki'
 import { wikiKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
@@ -17,16 +17,20 @@ import type { FormEvent , FC } from 'react'
 import type { WikiPage } from '@/types'
 
 
-const WikiSearchPage: FC = () => {
+const WikiSearchPage: FC<{ resourceType?: WikiPage['resourceType'] }> = (
+    { resourceType = 'tag_description' },
+) => {
   const { message, label } = useUITranslation ('shared')
   const locale = useLocale ()
+  const heading =
+      resourceType === 'tag_group'
+      ? 'navigation:tagGroups' : 'navigation:tagDescriptions'
   const [title, setTitle] = useState ('')
   const [text, setText] = useState ('')
   const [submittedTitle, setSubmittedTitle] = useState ('')
   const { data: results = [], refetch } = useQuery ({
-      queryKey: wikiKeys.index ({ title: submittedTitle }, locale),
+      queryKey: wikiKeys.index ({ title: submittedTitle, resourceType }, locale),
-      queryFn: () => apiGet<WikiPage[]> ('/wiki', {
+      queryFn: () => fetchWikiPages ({ title: submittedTitle, resourceType }, locale) })
-	  locale, params: { title: submittedTitle } }) })
 
   const handleSearch = (ev: FormEvent) => {
     ev.preventDefault ()
@@ -42,10 +46,10 @@ const WikiSearchPage: FC = () => {
 
   return (
       <MainArea>
-	<PageHead title={message ('navigation:wiki')}/>
+	<PageHead title={message (heading)}/>
 
 	<div className="max-w-xl">
-	  <PageTitle>{label ('navigation:wiki')}</PageTitle>
+	  <PageTitle>{label (heading)}</PageTitle>
 	  <form onSubmit={handleSearch} className="space-y-2">
 	    {/* タイトル */}
 	    <FormField label={label ('labels.title')}>