diff --git a/app/composables/useAgentSessions.ts b/app/composables/useAgentSessions.ts
index 388084d..596bcd0 100644
--- a/app/composables/useAgentSessions.ts
+++ b/app/composables/useAgentSessions.ts
@@ -9,6 +9,7 @@ export interface AgentSessionItem {
   modelId: number | null;
   enableThinking: number;
   enableTools: number;
+  systemPrompt: string | null;
   lastActiveAt: string;
   expiresAt: string | null;
   deletedAt: string | null;
@@ -110,7 +111,7 @@ export function useAgentSessions(agentSlug: string) {
 
   async function updateSessionConfig(
     id: string,
-    config: { modelId?: number | null; enableThinking?: boolean; enableTools?: boolean },
+    config: { modelId?: number | null; enableThinking?: boolean; enableTools?: boolean; systemPrompt?: string | null },
   ) {
     try {
       await $fetch(`/api/agents/${agentSlug}/sessions/${id}/config`, {
@@ -122,6 +123,7 @@ export function useAgentSessions(agentSlug: string) {
         if (config.modelId !== undefined) s.modelId = config.modelId;
         if (config.enableThinking !== undefined) s.enableThinking = config.enableThinking ? 1 : 0;
         if (config.enableTools !== undefined) s.enableTools = config.enableTools ? 1 : 0;
+        if (config.systemPrompt !== undefined) s.systemPrompt = config.systemPrompt;
       }
     } catch {
     }