diff --git a/packages/server/src/ws.ts b/packages/server/src/ws.ts
index 9ef0dcb..3c1a167 100644
--- a/packages/server/src/ws.ts
+++ b/packages/server/src/ws.ts
@@ -147,6 +147,7 @@ async function onHello(ctx: SocketCtx, msg: Extract<ClientMessage, { type: 'hell
     mode: game.mode,
     highlightingEnabled: game.highlightingEnabled,
     opponentConnected: !!game.players[color === 'w' ? 'b' : 'w']?.socket,
+    aiOpponent: game.aiOpponent,
   });
 
   // Notify peer that we're connected.
@@ -283,6 +284,7 @@ function sendUpdateTo(
     drawOffer,
     endReason: game.endReason,
     winner: game.winner ?? null,
+    aiOpponent: game.aiOpponent,
   });
 }
 
diff --git a/packages/server/test/integration/ai-game-casual.test.ts b/packages/server/test/integration/ai-game-casual.test.ts
index 4dab3a5..a7d7671 100644
--- a/packages/server/test/integration/ai-game-casual.test.ts
+++ b/packages/server/test/integration/ai-game-casual.test.ts
@@ -105,6 +105,9 @@ describe('AI game / Casual', () => {
     human.send({ type: 'hello', gameId, token: creatorToken });
     const joined = await human.waitFor((m) => m.type === 'joined');
     expect(joined.type === 'joined' && joined.you).toBe('b');
+    if (joined.type === 'joined') {
+      expect(joined.aiOpponent).toEqual({ color: 'w', brain: 'casual' });
+    }
 
     // Bot's opening move should arrive as an update (bot moves first as white).
     const botMoved = await human.waitFor((m) =>