diff --git a/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/api.ts b/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/api.ts
index 732eb100..b3a1b3c1 100644
--- a/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/api.ts
+++ b/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/api.ts
@@ -27,9 +27,12 @@ function assertOk<T>(res: Response, data: ApiEnvelope<T>, fallback: string) {
     }
 }
 
-export async function apiFetchSessions(params?: { mode?: ChatMode; errorMessage?: string }) {
-    const type = params?.mode ?? 'global';
-    const res = await authFetch(`/api/chat/sessions?type=${encodeURIComponent(type)}`, {
+export async function apiFetchSessions(params: { mode?: ChatMode; connectionId: string; errorMessage?: string }) {
+    const type = params.mode ?? 'global';
+    const url = new URL('/api/chat/sessions', window.location.origin);
+    url.searchParams.set('type', type);
+    url.searchParams.set('connectionId', params.connectionId);
+    const res = await authFetch(url.toString(), {
         method: 'GET',
         cache: 'no-store',
     });
@@ -54,7 +57,7 @@ export async function apiFetchSessionDetail(sessionId: string, options?: { error
     return { detail, messages };
 }
 
-export async function apiCreateSession(params: { mode: ChatMode; errorMessage?: string; copilotNotSupportedMessage?: string }) {
+export async function apiCreateSession(params: { mode: ChatMode; connectionId: string; errorMessage?: string; copilotNotSupportedMessage?: string }) {
     if (params.mode === 'copilot') {
         throw new Error(params.copilotNotSupportedMessage ?? 'Copilot sessions cannot be created manually.');
     }
@@ -65,6 +68,7 @@ export async function apiCreateSession(params: { mode: ChatMode; errorMessage?:
         cache: 'no-store',
         body: JSON.stringify({
             type: 'global',
+            connectionId: params.connectionId,
         }),
     });
 
diff --git a/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/session-controller.ts b/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/session-controller.ts
index 4b6bd669..af73281b 100644
--- a/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/session-controller.ts
+++ b/apps/web/app/(app)/[organization]/[connectionId]/chatbot/core/session-controller.ts
@@ -5,6 +5,7 @@ import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { toast } from 'sonner';
 import type { UIMessage } from 'ai';
 import { useTranslations } from 'next-intl';
+import { useParams } from 'next/navigation';
 import posthog from 'posthog-js';
 
 import type { ChatSessionItem, ChatMode } from './types';
@@ -23,6 +24,8 @@ export function useChatSessions(params: { mode: ChatMode; copilotEnvelope?: Copi
     const { mode, copilotEnvelope } = params;
     const copilotTabId = copilotEnvelope?.meta?.tabId ?? null;
     const t = useTranslations('Chatbot');
+    const routeParams = useParams<{ connectionId: string }>();
+    const connectionId = routeParams.connectionId;
 
     const [sessions, setSessions] = useState<ChatSessionItem[]>([]);
     const [selectedSessionId, setSelectedSessionId] = useState<string | null>(null);
@@ -55,7 +58,7 @@ export function useChatSessions(params: { mode: ChatMode; copilotEnvelope?: Copi
 
             setLoadingSessions(true);
             try {
-                const list = await apiFetchSessions({ mode: 'global', errorMessage: t('Errors.FetchSessions') });
+                const list = await apiFetchSessions({ mode: 'global', connectionId, errorMessage: t('Errors.FetchSessions') });
                 setSessions(list);
 
                 const currentPreferred = preferredId ?? selectedSessionRef.current;
@@ -74,7 +77,7 @@ export function useChatSessions(params: { mode: ChatMode; copilotEnvelope?: Copi
                 setLoadingSessions(false);
             }
         },
-        [mode, t],
+        [mode, connectionId, t],
     );
 
     const fetchSessionDetail = useCallback(async (sessionId: string) => {
@@ -178,7 +181,7 @@ export function useChatSessions(params: { mode: ChatMode; copilotEnvelope?: Copi
         if (creatingSession) return;
         setCreatingSession(true);
         try {
-            const created = await apiCreateSession({ mode: 'global', errorMessage: t('Errors.CreateSession') });
+            const created = await apiCreateSession({ mode: 'global', connectionId, errorMessage: t('Errors.CreateSession') });
             if (created?.id) {
                 posthog.capture('chat_session_created', { session_id: created.id });
             }
diff --git a/apps/web/app/api/chat/sessions/route.ts b/apps/web/app/api/chat/sessions/route.ts
index de6ba097..85fe51e3 100644
--- a/apps/web/app/api/chat/sessions/route.ts
+++ b/apps/web/app/api/chat/sessions/route.ts
@@ -36,6 +36,7 @@ export const GET = withUserAndOrganizationHandler(async ({ req, db, userId, orga
     const locale = await getApiLocale();
     const { searchParams } = new URL(req.url);
     const type = (searchParams.get('type') as ChatSessionType | null) ?? 'global';
+    const connectionId = searchParams.get('connectionId');
 
     if (type !== 'global' && type !== 'copilot') {
         return NextResponse.json(
@@ -47,6 +48,16 @@ export const GET = withUserAndOrganizationHandler(async ({ req, db, userId, orga
         );
     }
 
+    if (!connectionId) {
+        return NextResponse.json(
+            ResponseUtil.error({
+                code: ErrorCodes.INVALID_PARAMS,
+                message: translateApi('Api.Chat.Errors.ConnectionIdRequired', undefined, locale),
+            }),
+            { status: 400 },
+        );
+    }
+
     try {
         if (!db?.chat) throw new Error('Chat repository not available');
 
@@ -55,6 +66,7 @@ export const GET = withUserAndOrganizationHandler(async ({ req, db, userId, orga
             userId,
             type,
             includeArchived: false,
+            connectionId,
         });
 
         return NextResponse.json(
@@ -81,7 +93,7 @@ export const POST = withUserAndOrganizationHandler(async ({ req, db, userId, org
     const locale = await getApiLocale();
     console.log('POST /api/chat/sessions called', userId, organizationId);
 
-    let payload: { type?: string } | null = null;
+    let payload: { type?: string; connectionId?: string } | null = null;
     try {
         payload = await req.json();
     } catch {
@@ -89,6 +101,8 @@ export const POST = withUserAndOrganizationHandler(async ({ req, db, userId, org
     }
 
     const type = payload?.type ?? 'global';
+    const connectionId = payload?.connectionId ?? null;
+
     if (type !== 'global') {
         return NextResponse.json(
             ResponseUtil.error({
@@ -99,12 +113,23 @@ export const POST = withUserAndOrganizationHandler(async ({ req, db, userId, org
         );
     }
 
+    if (!connectionId) {
+        return NextResponse.json(
+            ResponseUtil.error({
+                code: ErrorCodes.INVALID_PARAMS,
+                message: translateApi('Api.Chat.Errors.ConnectionIdRequired', undefined, locale),
+            }),
+            { status: 400 },
+        );
+    }
+
     try {
         if (!db?.chat) throw new Error('Chat repository not available');
 
         const created = await db.chat.createGlobalSession({
             organizationId,
             userId,
+            connectionId,
             title: null,
             metadata: null,
         });
diff --git a/apps/web/lib/database/postgres/impl/chat/index.ts b/apps/web/lib/database/postgres/impl/chat/index.ts
index c68beb7f..1ad60e04 100644
--- a/apps/web/lib/database/postgres/impl/chat/index.ts
+++ b/apps/web/lib/database/postgres/impl/chat/index.ts
@@ -179,12 +179,13 @@ export class PostgresChatRepository implements ChatRepository {
     async listSessions(params: {
         organizationId: string;
         userId: string;
+        connectionId: string;
         includeArchived?: boolean;
         type?: ChatSessionType;
     }) {
         this.assertInited();
 
-        const conds = [eq(chatSessions.organizationId, params.organizationId), eq(chatSessions.userId, params.userId)];
+        const conds = [eq(chatSessions.organizationId, params.organizationId), eq(chatSessions.userId, params.userId), eq(chatSessions.connectionId, params.connectionId)];
         if (!params.includeArchived) conds.push(isNull(chatSessions.archivedAt));
         if (params.type) conds.push(eq(chatSessions.type, params.type));
 
diff --git a/apps/web/public/locales/en.json b/apps/web/public/locales/en.json
index 47f14696..e83d187d 100644
--- a/apps/web/public/locales/en.json
+++ b/apps/web/public/locales/en.json
@@ -1736,6 +1736,7 @@
                 "MissingTabId": "Missing tabId",
                 "FetchCopilotSessionFailed": "Failed to fetch Copilot session",
                 "InvalidSessionType": "Invalid session type",
+                "ConnectionIdRequired": "Connection ID is required",
                 "ListSessionsFailed": "Failed to fetch sessions",
                 "CopilotCreationNotAllowed": "Copilot sessions cannot be created via this endpoint",
                 "CreateSessionFailed": "Failed to create session"
diff --git a/apps/web/public/locales/es.json b/apps/web/public/locales/es.json
index dae47047..2b5fd0ea 100644
--- a/apps/web/public/locales/es.json
+++ b/apps/web/public/locales/es.json
@@ -1724,6 +1724,7 @@
                 "MissingTabId": "Falta tabId",
                 "FetchCopilotSessionFailed": "No se pudo obtener la sesión de Copilot",
                 "InvalidSessionType": "Tipo de sesión no válido",
+                "ConnectionIdRequired": "Se requiere el ID de conexión",
                 "ListSessionsFailed": "No se pudieron obtener las sesiones",
                 "CopilotCreationNotAllowed": "Las sesiones de Copilot no se pueden crear desde este endpoint",
                 "CreateSessionFailed": "No se pudo crear la sesión"
diff --git a/apps/web/public/locales/ja.json b/apps/web/public/locales/ja.json
index 398d47a7..d589340f 100644
--- a/apps/web/public/locales/ja.json
+++ b/apps/web/public/locales/ja.json
@@ -1724,6 +1724,7 @@
                 "MissingTabId": "tabId がありません",
                 "FetchCopilotSessionFailed": "Copilot セッションの取得に失敗しました",
                 "InvalidSessionType": "無効なセッション種別です",
+                "ConnectionIdRequired": "接続IDが必要です",
                 "ListSessionsFailed": "セッションの取得に失敗しました",
                 "CopilotCreationNotAllowed": "このエンドポイントでは Copilot セッションを作成できません",
                 "CreateSessionFailed": "セッションの作成に失敗しました"
diff --git a/apps/web/public/locales/zh.json b/apps/web/public/locales/zh.json
index fa435af1..3c5c40d7 100644
--- a/apps/web/public/locales/zh.json
+++ b/apps/web/public/locales/zh.json
@@ -1738,6 +1738,7 @@
                 "MissingTabId": "缺少 tabId",
                 "FetchCopilotSessionFailed": "获取 Copilot 会话失败",
                 "InvalidSessionType": "非法的 session type",
+                "ConnectionIdRequired": "缺少 Connection ID 参数",
                 "ListSessionsFailed": "获取会话列表失败",
                 "CopilotCreationNotAllowed": "Copilot 会话不能通过该接口创建",
                 "CreateSessionFailed": "创建会话失败"
diff --git a/apps/web/types/chat.ts b/apps/web/types/chat.ts
index 1c34099a..ba5919db 100644
--- a/apps/web/types/chat.ts
+++ b/apps/web/types/chat.ts
@@ -178,7 +178,7 @@ export interface ChatRepository {
 
     createGlobalSession(input: ChatSessionCreateGlobal): Promise<ChatSessionRecord>;
 
-    listSessions(params: { organizationId: string; userId: string; includeArchived?: boolean; type?: ChatSessionType }): Promise<ChatSessionRecord[]>;
+    listSessions(params: { organizationId: string; userId: string; connectionId: string; includeArchived?: boolean; type?: ChatSessionType }): Promise<ChatSessionRecord[]>;
 
     readSession(params: { organizationId: string; sessionId: string; userId: string }): Promise<ChatSessionRecord | null>;