diff --git a/apps/admin/README.md b/apps/admin/README.md
index 7c8333ec..9de9102b 100644
--- a/apps/admin/README.md
+++ b/apps/admin/README.md
@@ -7,6 +7,16 @@ Traefik ingress also redirects HTTP to HTTPS.
 
 See [configuration, authentication, service boundaries and commands](../../docs/admin.md).
 
+## User details
+
+The user Details tab shows reader-profile fields and Dev Card styling only when
+the account has a configured username. Claimed profiles remain inspectable by
+admins when public visibility is disabled. Accounts without a username still
+show account information, reading activity, personalization, and preferences.
+
+Validate these states with `npm run admin:test` and, after `npm run admin:build`,
+`node apps/admin/tests/browser/user-must-reads.mjs`.
+
 ## Shared table columns
 
 `DataTableColumn` and resource `ColumnSpec` accept a `kind` that selects a shared
diff --git a/apps/admin/src/components/organisms/user-details.tsx b/apps/admin/src/components/organisms/user-details.tsx
index 5ddcc686..67a4c1aa 100644
--- a/apps/admin/src/components/organisms/user-details.tsx
+++ b/apps/admin/src/components/organisms/user-details.tsx
@@ -143,6 +143,7 @@ function UserDisclosure({ title, children }: { title: string; children: React.Re
 }
 
 export function UserDetailsOverview({ user }: { user: AdminUserDetail }) {
+  const hasUsername = Boolean(user.username?.trim());
   return (
     <div className="space-y-6">
       <div className="grid items-start gap-6 lg:grid-cols-2">
@@ -183,30 +184,32 @@ export function UserDetailsOverview({ user }: { user: AdminUserDetail }) {
             },
           ]}
         />
-        <UserProfileDetails user={user} />
-        <div className="min-w-0 space-y-6">
+        {hasUsername && <UserProfileDetails user={user} />}
+        <div className={hasUsername ? "min-w-0 space-y-6" : "contents"}>
           <UserFeedStatus user={user} />
           <UserActivitySummary user={user} />
         </div>
       </div>
-      <UserDisclosure title="Dev Card styling">
-        <InfoPanel
-          title="Dev Card"
-          fields={[
-            { label: "Theme", value: humanize(user.dev_card.theme ?? "classic") },
-            { label: "Accent", value: humanize(user.dev_card.accent ?? "default") },
-            { label: "Motion", value: humanize(user.dev_card.motion ?? "animated") },
-            {
-              label: "Technologies",
-              value: <DataValue value={user.dev_card_technologies.map((item) => item.name)} />,
-            },
-            {
-              label: "Featured stats",
-              value: <DataValue value={(user.dev_card.stats ?? []).map(humanize)} />,
-            },
-          ]}
-        />
-      </UserDisclosure>
+      {hasUsername && (
+        <UserDisclosure title="Dev Card styling">
+          <InfoPanel
+            title="Dev Card"
+            fields={[
+              { label: "Theme", value: humanize(user.dev_card.theme ?? "classic") },
+              { label: "Accent", value: humanize(user.dev_card.accent ?? "default") },
+              { label: "Motion", value: humanize(user.dev_card.motion ?? "animated") },
+              {
+                label: "Technologies",
+                value: <DataValue value={user.dev_card_technologies.map((item) => item.name)} />,
+              },
+              {
+                label: "Featured stats",
+                value: <DataValue value={(user.dev_card.stats ?? []).map(humanize)} />,
+              },
+            ]}
+          />
+        </UserDisclosure>
+      )}
       <UserDisclosure title="Reader preferences">
         <div className="grid items-start gap-4 lg:grid-cols-2">
           <InfoPanel
diff --git a/apps/admin/tests/browser/user-must-reads.mjs b/apps/admin/tests/browser/user-must-reads.mjs
index 6b8f5ccc..21113c90 100644
--- a/apps/admin/tests/browser/user-must-reads.mjs
+++ b/apps/admin/tests/browser/user-must-reads.mjs
@@ -48,6 +48,7 @@ const user = {
   notification_preferences: { show_badge: true, sound: false },
 };
 let mode = "ready";
+let configuredUsername = user.username;
 let rejectOnce = false;
 const requests = [];
 const fixture = createServer((req, res) => {
@@ -67,7 +68,7 @@ const fixture = createServer((req, res) => {
   else if (path.endsWith("/settings"))
     body = { appearance: { theme: "light" }, defaults: { refresh_seconds: 0 } };
   else if (path.endsWith("/notifications/config")) body = { enabled: false };
-  else if (path === `/v1/admin/users/${userId}`) body = user;
+  else if (path === `/v1/admin/users/${userId}`) body = { ...user, username: configuredUsername };
   else if (path === `/v1/admin/users/${userId}/interests`)
     body = { items: [], total: 0, limit: 5, offset: 0 };
   else if (path === `/v1/admin/users/${userId}/must-reads`) {
@@ -194,6 +195,7 @@ try {
   }
   await page.goto(`${origin}/users/${userId}`);
   await page.getByText("Account", { exact: true }).waitFor();
+  await page.getByText("Reader profile", { exact: true }).waitFor();
   for (const title of ["Dev Card styling", "Reader preferences", "Technical identifiers"]) {
     const disclosure = page
       .locator("details")
@@ -217,6 +219,55 @@ try {
       await page.screenshot({ path: `${output}/details-${theme}-${width}.png`, fullPage: true });
     }
   }
+  configuredUsername = null;
+  await page.reload();
+  await page.getByText("Account", { exact: true }).waitFor();
+  for (const title of ["Reader profile", "Dev Card styling", "Dev Card"]) {
+    assert.equal(await page.getByText(title, { exact: true }).count(), 0);
+  }
+  for (const title of ["Reading activity", "Recommendation refresh", "Personalization"]) {
+    assert.equal(await page.getByText(title, { exact: true }).count(), 1);
+  }
+  for (const title of ["Reader preferences", "Technical identifiers"]) {
+    const disclosure = page
+      .locator("details")
+      .filter({ has: page.locator("summary", { hasText: title }) });
+    assert.equal(await disclosure.evaluate((node) => node.open), false);
+    await disclosure.locator("summary").focus();
+    await page.keyboard.press("Enter");
+    assert.equal(await disclosure.evaluate((node) => node.open), true);
+    await disclosure.locator("summary").click();
+  }
+  for (const theme of ["light", "dark"]) {
+    await page
+      .locator("html")
+      .evaluate((node, theme) => node.classList.toggle("dark", theme === "dark"), theme);
+    for (const width of [1440, 390]) {
+      await page.setViewportSize({ width, height: 1000 });
+      assert.equal(
+        await page.evaluate(() => document.documentElement.scrollWidth > innerWidth),
+        false,
+      );
+      if (width === 1440) {
+        const refreshPanel = await page
+          .getByText("Recommendation refresh", { exact: true })
+          .locator('xpath=ancestor::div[@data-slot="card"]')
+          .boundingBox();
+        const activityPanel = await page
+          .getByText("Personalization", { exact: true })
+          .locator('xpath=ancestor::div[@data-slot="card"]')
+          .boundingBox();
+        assert.ok(refreshPanel && activityPanel);
+        assert.ok(Math.abs(refreshPanel.y - activityPanel.y) < 1);
+        assert.ok(refreshPanel.x < activityPanel.x);
+      }
+      await page.screenshot({ path: `${output}/unclaimed-${theme}-${width}.png`, fullPage: true });
+    }
+  }
+  configuredUsername = user.username;
+  await page.reload();
+  await page.getByText("Reader profile", { exact: true }).waitFor();
+  assert.equal(await page.getByText("Dev Card styling", { exact: true }).count(), 1);
   await page.goto(`${origin}/users/${userId}/analysis`);
   mode = "empty";
   await page.reload();
@@ -240,7 +291,7 @@ try {
   );
   assert.deepEqual(errors, []);
   console.log(
-    "Admin Must Reads: saved picks, reasons, timezone, read progress, empty states, retry, and responsive themes passed.",
+    "Admin users: claimed/unclaimed profile visibility, keyboard disclosures, responsive themes, and Must Reads passed.",
   );
 } catch (error) {
   console.error(logs);
diff --git a/apps/admin/tests/users.test.tsx b/apps/admin/tests/users.test.tsx
index 966986e5..67ef0d25 100644
--- a/apps/admin/tests/users.test.tsx
+++ b/apps/admin/tests/users.test.tsx
@@ -1,10 +1,15 @@
 // @vitest-environment jsdom
 import { afterEach, beforeEach, expect, it, vi } from "vitest";
-import { act, cleanup, fireEvent, screen, waitFor, within } from "@testing-library/react";
+import { act, cleanup, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import { renderAdmin } from "./render-admin";
 import { ResourceList } from "@/components/organisms/resource-list";
 import { ResourceDetail } from "@/components/organisms/resource-detail";
-import { UserRecords, UserAnalysis, UserAnalysisAction } from "@/components/organisms/user-details";
+import {
+  UserRecords,
+  UserAnalysis,
+  UserAnalysisAction,
+  UserDetailsOverview,
+} from "@/components/organisms/user-details";
 import { getRecord, listRecords, listUserRecords } from "@/lib/resource-api";
 import { adminRouteTitle } from "@/lib/page-titles";
 import type { AdminUserDetail } from "@/lib/api/generated/models";
@@ -135,6 +140,46 @@ it("shows account information and links to existing-style detail sections", asyn
   expect(screen.queryByRole("link", { name: "Logs" })).toBeNull();
   expect(screen.queryByRole("link", { name: "Open in graph" })).toBeNull();
 });
+
+it.each([null, undefined, "", "   "])(
+  "omits profile and Dev Card details when the username is %j",
+  async (username) => {
+    vi.mocked(getRecord).mockResolvedValue({ ...user, username });
+    renderAdmin(<ResourceDetail resource="users" id="user-1" />);
+    await screen.findByText("Account");
+    expect(screen.queryByText("Reader profile")).toBeNull();
+    expect(screen.queryByText("Dev Card styling")).toBeNull();
+    expect(screen.queryByText("Dev Card")).toBeNull();
+    expect(screen.queryByRole("link", { name: "Website" })).toBeNull();
+    expect(screen.queryByText("London")).toBeNull();
+    for (const title of [
+      "Reading activity",
+      "Recommendation refresh",
+      "Personalization",
+      "Reader preferences",
+      "Technical identifiers",
+    ]) {
+      expect(screen.getByText(title)).toBeTruthy();
+    }
+    expect(screen.getByText("Longest streak")).toBeTruthy();
+    expect(screen.getByRole("link", { name: "Reading days" })).toBeTruthy();
+  },
+);
+
+it("shows claimed profile details for private profiles and updates when the username changes", () => {
+  const view = render(<UserDetailsOverview user={{ ...user, profile_public: false }} />);
+  expect(screen.getByText("Reader profile")).toBeTruthy();
+  expect(screen.getByText("Hidden")).toBeTruthy();
+  expect(screen.getByText("Dev Card styling")).toBeTruthy();
+  view.rerender(<UserDetailsOverview user={{ ...user, username: null }} />);
+  expect(screen.queryByText("Reader profile")).toBeNull();
+  expect(screen.queryByText("Dev Card styling")).toBeNull();
+  view.rerender(<UserDetailsOverview user={user} />);
+  expect(screen.getByText("Reader profile")).toBeTruthy();
+  expect(screen.getByText("Dev Card styling")).toBeTruthy();
+  expect(screen.getByRole("link", { name: "Website" })).toBeTruthy();
+});
+
 it("labels stale prepared results and fetches only the selected user section", async () => {
   renderAdmin(
     <UserRecords user={{ ...user, feed_status: "refreshing" }} section="recommendations" />,