v4: a moderator's or an admin's @everyone in the chat notifies every user — there was no way to reach everyone at once. The new chat:everyone permission, held by moderators and admins, lets a chat message saying @everyone notify every user but its author and those reading the chat, through notifyEveryone, after notifyMentions, so a user also named is told once, by name; the notification is a user_mentioned with everyone set, which the notifications page and the digest word as "mentioned everyone in the chat". chat_messages.mentions_everyone, sent as ChatMessage.mentionsEveryone, is set from the author's role each time the body is written, so a user's @everyone reaches no one, a moderator's edit of a user's message can't make it reach everyone, and a demoted author's next edit loses it. Only an edit that adds @everyone notifies, so fixing an announcement's typo reaches no one new. The client highlights and chimes by the flag, never by the text; Markdown shows @everyone as a mention only in a flagged message, and never links it to a profile. The chat composer offers @everyone first to those who may say it. No account may be named everyone, in any case: migration 0023 adds the column, flags the moderators' and admins' past @everyone messages, renames a user named everyone to everyone_N and drops an alias everyone. 265 backend tests and 681 frontend tests pass, and deno check, tsc, eslint, doc:lint and i18n:compile --strict are clean; checked in screenshots of the chat at 1280 and 390px, with a moderator's and a user's @everyone and the suggestions open.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/test/components/chat/ChatModal.test.tsx

@@ -421,6 +421,33 @@ describe("ChatModal: live", () => {
     );
   });
 
+  test("@everyone stands out only when the server flagged it", async () => {
+    const { socket } = await setup();
+    for (
+      const [id, body, mentionsEveryone] of [
+        ["e1", "@everyone typed by anyone", undefined],
+        ["e2", "@everyone from a moderator", true],
+      ] as const
+    ) {
+      socket.receive({
+        type: "chat_message",
+        message: wire(
+          makeChatMessage({
+            id,
+            body,
+            createdAt: new Date(),
+            mentionsEveryone,
+          }),
+        ),
+      });
+    }
+    const row = (text: RegExp) =>
+      screen.getByText(text).closest(".chat-message");
+    expect(row(/typed by anyone/)).not.toHaveClass("chat-message--mention");
+    expect(row(/from a moderator/)).toHaveClass("chat-message--mention");
+    expect(screen.getByText("@everyone")).toHaveClass("md-everyone");
+  });
+
   test("an emoji-only message is shown large", async () => {
     await setup([makeChatMessage({ body: "🎉🎉" })]);
     expect(document.querySelector(".chat-message-text--jumbo"))

src/test/components/editor/Markdown.test.tsx

@@ -33,6 +33,18 @@ describe("Markdown", () => {
     expect(currentPath()).toBe("/@ann");
   });
 
+  test("@everyone links nowhere, and shows as a mention only when flagged", () => {
+    md("hi @everyone");
+    expect(screen.queryByRole("link")).toBeNull();
+    expect(screen.getByText("hi @everyone")).toBeInTheDocument();
+    renderWithContexts(<Markdown everyone>{"yo @Everyone and @ann"}</Markdown>);
+    expect(screen.getByText("@Everyone")).toHaveClass("md-everyone");
+    expect(screen.getByRole("link", { name: "@ann" })).toHaveAttribute(
+      "href",
+      "/@ann",
+    );
+  });
+
   test("mentions in code and inside URLs are left alone", () => {
     md("`@ann` and https://mastodon.social/@bob");
     expect(screen.getByText("@ann").tagName).toBe("CODE");

src/test/hooks/editor/useMentionAutocomplete.test.tsx

@@ -29,9 +29,9 @@ describe("useMentionAutocomplete", () => {
     { id: "3", username: "albert", avatarMime: null },
   ];
 
-  function setup() {
+  function setup(everyone = false) {
     const replace = vi.fn();
-    const hook = renderHook(() => useMentionAutocomplete(replace));
+    const hook = renderHook(() => useMentionAutocomplete(replace, everyone));
     const type = async (value: string, cursor = value.length) => {
       act(() => hook.result.current.syncMention(value, cursor, true));
       await act(() => vi.advanceTimersByTimeAsync(200));
@@ -56,6 +56,21 @@ describe("useMentionAutocomplete", () => {
     );
   });
 
+  test("offers @everyone first, only when allowed", async () => {
+    route("GET /api/users", () => [users[0]]);
+    const allowed = setup(true);
+    await allowed.type("@E");
+    expect(allowed.hook.result.current.mentionResults.map((u) => u.username))
+      .toEqual(["everyone", "alice"]);
+    await allowed.type("@al");
+    expect(allowed.hook.result.current.mentionResults.map((u) => u.username))
+      .toEqual(["alice"]);
+    const denied = setup();
+    await denied.type("@e");
+    expect(denied.hook.result.current.mentionResults.map((u) => u.username))
+      .toEqual(["alice"]);
+  });
+
   test("debounces keystrokes into one lookup", async () => {
     route("GET /api/users", () => users);
     const { hook } = setup();

src/test/pages/Notifications.test.tsx

@@ -134,6 +134,17 @@ const n = {
       contextTitle: "",
     },
   }),
+  mentionEveryone: makeNotification({
+    type: "user_mentioned",
+    data: {
+      mentionerId: "m",
+      mentionerUsername: "mo",
+      contextType: "chat",
+      contextId: "y",
+      contextTitle: "",
+      everyone: true,
+    },
+  }),
   mentionPlaylist: makeNotification({
     type: "user_mentioned",
     data: {
@@ -170,8 +181,9 @@ describe("Notifications", () => {
       "/notifications?chat=x",
       "/@bob/playlists/faves",
     ]);
+    expect(await link(/mentioned everyone in/)).toBe("/notifications?chat=y");
     expect(screen.getByText("a comment")).toBeInTheDocument();
-    expect(screen.getByText("the chat")).toBeInTheDocument();
+    expect(screen.getAllByText("the chat")).toHaveLength(2);
     expect(screen.getByText("Faves")).toBeInTheDocument();
   });