diff --git a/frontend/src/pages/ArticlesPage.css b/frontend/src/pages/ArticlesPage.css
index 62bdc78..2e9075b 100644
--- a/frontend/src/pages/ArticlesPage.css
+++ b/frontend/src/pages/ArticlesPage.css
@@ -414,3 +414,48 @@
 .article-danger p { margin: 0 0 10px; font-size: 0.86rem; line-height: 1.55; color: var(--text-muted); max-width: 62ch; }
 .article-danger-actions { display: flex; gap: 8px; flex-wrap: wrap; }
 .article-danger-open { color: var(--wrong-fg); }
+
+/* The identifiers, at the top of the editor. Both are looked for and neither
+   was anywhere on the page: the id had to be read out of the address bar and
+   the slug out of the form field below.
+
+   The third chip is the useful one — the cross-reference marker itself, id and
+   title already assembled, because that is what somebody wants these two
+   numbers *for*. */
+.article-ids { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
+.article-id {
+  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
+  padding: 4px 10px; border: 1px solid var(--border); border-radius: 999px;
+  background: var(--card-bg); font: inherit; font-size: 0.78rem; color: var(--text-muted);
+}
+.article-id:hover { border-color: var(--primary); color: var(--text); }
+.article-id span { font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; font-size: 0.66rem; }
+.article-id code {
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.76rem; color: var(--text);
+}
+.article-id.is-marker code { color: var(--primary); }
+.article-id.is-marker { max-width: 100%; overflow: hidden; }
+.article-id.is-marker code { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.article-id.is-copied { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 8%, transparent); }
+.article-id-said { font-size: 0.76rem; font-weight: 600; color: var(--primary); }
+
+@media (max-width: 560px) {
+  .article-id.is-marker { display: none; }   /* The marker is a desktop errand. */
+}
+
+/* Cross-references that point at nothing, said on save — the last moment the
+   person who wrote the link is still looking at it. The backend has computed
+   this since markers existed; nothing had ever shown it. */
+.article-broken {
+  display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px;
+  padding: 11px 14px; border-radius: 9px;
+  background: color-mix(in srgb, var(--wrong-fg) 7%, transparent);
+  border: 1px solid color-mix(in srgb, var(--wrong-fg) 24%, transparent);
+  font-size: 0.86rem;
+}
+.article-broken code {
+  display: inline-block; margin-right: 6px; padding: 1px 6px; border-radius: 5px;
+  background: var(--card-bg); font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+  font-size: 0.78rem;
+}
+.article-broken-hint { font-size: 0.8rem; color: var(--text-muted); }
diff --git a/frontend/src/pages/ArticlesPage.jsx b/frontend/src/pages/ArticlesPage.jsx
index 7f682ae..a1d6bbe 100644
--- a/frontend/src/pages/ArticlesPage.jsx
+++ b/frontend/src/pages/ArticlesPage.jsx
@@ -231,6 +231,12 @@ export function ArticlePage() {
   const [savedForm, setSavedForm] = useState(null)
   const [confirmDiscard, setConfirmDiscard] = useState(false)
   const [confirmDelete, setConfirmDelete] = useState(false)
+  //: Which identifier was last copied, so the button can say so. Cleared on a
+  //: timer rather than left standing: "Copied" next to a button nobody has
+  //: pressed for a minute is a lie about the clipboard.
+  const [copied, setCopied] = useState('')
+  //: Cross-references in this article that point at nothing, as of the last save.
+  const [broken, setBroken] = useState([])
   const [aiJob, setAiJob] = useState(null)
   const [aiMessage, setAiMessage] = useState('')
   const [showRefine, setShowRefine] = useState(false)
@@ -301,6 +307,12 @@ export function ArticlePage() {
   //: next time a field is added.
   const dirty = !!form && !!savedForm && JSON.stringify(form) !== JSON.stringify(savedForm)
 
+  const copyBit = (which, value) => {
+    navigator.clipboard?.writeText(value)
+    setCopied(which)
+    setTimeout(() => setCopied(''), 2000)
+  }
+
   const remove = async () => {
     setSaving(true); setError('')
     try {
@@ -330,6 +342,11 @@ export function ArticlePage() {
       const payload = { ...form }
       const res = await api.patch(`/articles/${id}`, payload)
       setArticle(res.data)
+      // The backend has checked every cross-reference in the body and says
+      // which point at nothing. It has said so since the markers existed and
+      // nothing has ever shown it — a dead link found a week later belongs to
+      // nobody, which was the whole reason for checking on save.
+      setBroken(res.data?.broken_links || [])
       if (publish !== null) {
         await api.post(`/articles/${id}/publish`, { published: publish })
         setArticle(prev => ({ ...prev, status: publish ? 'published' : 'draft' }))
@@ -397,10 +414,23 @@ export function ArticlePage() {
   // Moderator business, and rare: kept above the reading rather than folded
   // into it, with the page's gutters back so an alert is not flush to the
   // window edge.
-  const hasNotices = !!error || (showRefine && user?.is_moderator)
+  const hasNotices = !!error || broken.length > 0 || (showRefine && user?.is_moderator)
   const notices = (
     <>
       {error && <div className="form-error" role="alert">{error}</div>}
+      {broken.length > 0 && (
+        <div className="article-broken" role="alert">
+          <strong>
+            {broken.length} cross-reference{broken.length === 1 ? '' : 's'} in this article
+            point{broken.length === 1 ? 's' : ''} at nothing:
+          </strong>
+          <span>{broken.map(marker => <code key={marker}>{marker}</code>)}</span>
+          <span className="article-broken-hint">
+            Saved anyway — a link to an article that does not exist yet is a note to
+            write it. It will start working the moment that article does.
+          </span>
+        </div>
+      )}
       {showRefine && user?.is_moderator && (
         <div className="card" style={{ marginBottom: 12 }}>
           <h4>AI refine</h4>
@@ -426,6 +456,27 @@ export function ArticlePage() {
               ← Back to the article
             </button>
             <h1>{article.title} <DraftBadge status={article.status} /></h1>
+            {/* The two identifiers, at the top where they are looked for, and
+                the marker that uses them. The id is what a cross-reference
+                should carry — a slug can be renamed, an id cannot — so the
+                third button hands over the whole thing, ready to paste into
+                another article. */}
+            <div className="article-ids">
+              <button type="button" className={`article-id${copied === 'id' ? ' is-copied' : ''}`}
+                title="Copy this article's id" onClick={() => copyBit('id', String(article.id))}>
+                <span>ID</span><code>{article.id}</code>
+              </button>
+              <button type="button" className={`article-id${copied === 'slug' ? ' is-copied' : ''}`}
+                title="Copy this article's slug" onClick={() => copyBit('slug', article.slug)}>
+                <span>Slug</span><code>{article.slug}</code>
+              </button>
+              <button type="button" className={`article-id is-marker${copied === 'marker' ? ' is-copied' : ''}`}
+                title="Copy a link to this article, ready to paste into another one"
+                onClick={() => copyBit('marker', `[[${article.id}|${article.title}]]`)}>
+                <code>[[{article.id}|{article.title}]]</code>
+              </button>
+              {copied && <span className="article-id-said" role="status">Copied</span>}
+            </div>
           </div>
           <div className="article-header-actions">
             {/* A way out that is not Save. There was none: the only controls
diff --git a/frontend/src/pages/ArticlesPage.test.jsx b/frontend/src/pages/ArticlesPage.test.jsx
index 437ea10..c34d8c7 100644
--- a/frontend/src/pages/ArticlesPage.test.jsx
+++ b/frontend/src/pages/ArticlesPage.test.jsx
@@ -256,6 +256,23 @@ describe('topic reading', () => {
   // three. The contents are filtered by the same choice as the body, so the
   // rail can never offer a heading the article is no longer showing — which is
   // the failure worth guarding, not the switch itself.
+  it('says which cross-references point at nothing, on save', async () => {
+    api.get.mockImplementation(url => (url === '/articles/1'
+      ? Promise.resolve({ data: article })
+      : Promise.resolve({ data: [] })))
+    api.patch.mockResolvedValue({ data: { ...article, broken_links: ['[[999|…]]', '[[no-such-topic]]'] } })
+    render(<MemoryRouter initialEntries={['/articles/1?edit=1']}><Routes><Route path="/articles/:id" element={<ArticlePage />} /></Routes></MemoryRouter>)
+
+    await userEvent.click(await screen.findByRole('button', { name: 'Save' }))
+    const notice = await screen.findByRole('alert')
+    expect(notice).toHaveTextContent('2 cross-references in this article point at nothing')
+    expect(within(notice).getByText('[[999|…]]')).toBeInTheDocument()
+    expect(within(notice).getByText('[[no-such-topic]]')).toBeInTheDocument()
+    // Said, not refused: a link to an article nobody has written yet is a note
+    // to write it.
+    expect(notice).toHaveTextContent('Saved anyway')
+  })
+
   it('keeps the contents rail in step with the depth being read', async () => {
     const layered = { ...article, sections: [
       { id: 'a'.repeat(32), slug: 'key', title: 'Key points', content: 'Key body', variant: 'short' },