diff --git a/apps/web/src/test/integration/_helpers/auth.ts b/apps/web/src/test/integration/_helpers/auth.ts
index a03b597..b31fb0b 100644
--- a/apps/web/src/test/integration/_helpers/auth.ts
+++ b/apps/web/src/test/integration/_helpers/auth.ts
@@ -43,11 +43,21 @@ export function getTestAuthContext(): TestAuthContext {
 
 /**
  * Create a fetch function with session cookie authentication
+ *
+ * Note: better-auth uses different cookie names for HTTP vs HTTPS:
+ * - HTTP: better-auth.session_token
+ * - HTTPS: __Secure-better-auth.session_token
+ *
+ * We send both to ensure compatibility.
  */
 export function createSessionFetch(sessionToken: string): typeof fetch {
   return (input: RequestInfo | URL, init?: RequestInit) => {
     const headers = new Headers(init?.headers);
-    headers.set('Cookie', `better-auth.session_token=${sessionToken}`);
+    // Send both cookie formats to work with both HTTP and HTTPS
+    headers.set(
+      'Cookie',
+      `better-auth.session_token=${sessionToken}; __Secure-better-auth.session_token=${sessionToken}`
+    );
 
     return fetch(input, {
       ...init,
diff --git a/apps/web/src/test/integration/_helpers/factories/agent.factory.ts b/apps/web/src/test/integration/_helpers/factories/agent.factory.ts
index 4425c9d..b65c435 100644
--- a/apps/web/src/test/integration/_helpers/factories/agent.factory.ts
+++ b/apps/web/src/test/integration/_helpers/factories/agent.factory.ts
@@ -64,7 +64,10 @@ export function createAgentFactory(api: ApiClient, tracker: TestDataTracker) {
       });
 
       if (!result.ok) {
-        throw new Error(`Failed to create agent: ${(result as { error: string }).error}`);
+        const errorResult = result as { error: string; status: number };
+        throw new Error(
+          `Failed to create agent: ${errorResult.error} (status: ${errorResult.status})`
+        );
       }
 
       const agent = result.data.data;
diff --git a/apps/web/src/test/integration/_helpers/factories/collection.factory.ts b/apps/web/src/test/integration/_helpers/factories/collection.factory.ts
index 68029b8..6ae9c88 100644
--- a/apps/web/src/test/integration/_helpers/factories/collection.factory.ts
+++ b/apps/web/src/test/integration/_helpers/factories/collection.factory.ts
@@ -53,7 +53,10 @@ export function createCollectionFactory(api: ApiClient, tracker: TestDataTracker
       );
 
       if (!result.ok) {
-        throw new Error(`Failed to create collection: ${(result as { error: string }).error}`);
+        const errorResult = result as { error: string; status: number };
+        throw new Error(
+          `Failed to create collection: ${errorResult.error} (status: ${errorResult.status})`
+        );
       }
 
       const collection = result.data.data;