diff --git a/@applications/api/src/modules/session/session.controller.ts b/@applications/api/src/modules/session/session.controller.ts
index 1733a47..14909a4 100644
--- a/@applications/api/src/modules/session/session.controller.ts
+++ b/@applications/api/src/modules/session/session.controller.ts
@@ -6,6 +6,7 @@ import {
   HttpCode,
   HttpStatus,
   Param,
+  Patch,
   Post,
   Query,
 } from '@nestjs/common';
@@ -15,6 +16,7 @@ import {
   CreateSessionResponseDto,
   SessionListItemDto,
   SessionMessageDto,
+  UpdateSessionTitleDto,
 } from './dto/session.dto';
 
 @Controller('session')
@@ -44,6 +46,16 @@ export class SessionController {
     return { session_id: session.id };
   }
 
+  @Patch(':id/title')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async updateTitle(
+    @Param('id') sessionId: string,
+    @Body() dto: UpdateSessionTitleDto,
+  ): Promise<void> {
+    await this.sessionService.getSession(sessionId); // validate exists
+    await this.sessionService.updateTitle(sessionId, dto.title, true);
+  }
+
   @Get(':id/history')
   async getHistory(@Param('id') sessionId: string): Promise<SessionMessageDto[]> {
     return this.sessionService.getHistory(sessionId);
diff --git a/@applications/api/src/modules/session/session.service.ts b/@applications/api/src/modules/session/session.service.ts
index a0ffe2b..a364073 100644
--- a/@applications/api/src/modules/session/session.service.ts
+++ b/@applications/api/src/modules/session/session.service.ts
@@ -93,6 +93,17 @@ export class SessionService {
     return this.messageRepo.save(message);
   }
 
+  async getMessageCount(sessionId: string): Promise<number> {
+    return this.messageRepo.count({ where: { sessionId } });
+  }
+
+  async updateTitle(sessionId: string, title: string, isManual: boolean): Promise<void> {
+    await this.sessionRepo.update(sessionId, {
+      title,
+      titleIsManual: isManual,
+    });
+  }
+
   async listSessions(options: {
     userId?: string | null;
     limit?: number;
@@ -149,6 +160,8 @@ export class SessionService {
       last_activity_at: s.lastActivityAt.toISOString(),
       message_count: countMap.get(s.id) ?? 0,
       preview: previewMap.get(s.id) ?? null,
+      title: s.title,
+      title_is_manual: s.titleIsManual,
     }));
   }
 }