diff --git a/server/api/agents/[agentSlug]/sessions/[id]/config.put.ts b/server/api/agents/[agentSlug]/sessions/[id]/config.put.ts
index 2b3f8c0..6dde35e 100644
--- a/server/api/agents/[agentSlug]/sessions/[id]/config.put.ts
+++ b/server/api/agents/[agentSlug]/sessions/[id]/config.put.ts
@@ -27,16 +27,28 @@ export default defineWrappedResponseHandler(async (event) => {
   }
 
   const body = await readBody(event);
-  const { modelId, enableThinking, enableTools } = body as {
+  const { modelId, enableThinking, enableTools, systemPrompt } = body as {
     modelId?: number;
     enableThinking?: number;
     enableTools?: number;
+    systemPrompt?: string | null;
   };
 
-  const updates: { modelId?: number | null; enableThinking?: number | null; enableTools?: number | null } = {};
+  const updates: {
+    modelId?: number | null;
+    enableThinking?: number | null;
+    enableTools?: number | null;
+    systemPrompt?: string | null;
+  } = {};
   if (modelId !== undefined) updates.modelId = modelId;
   if (enableThinking !== undefined) updates.enableThinking = enableThinking ? 1 : 0;
   if (enableTools !== undefined) updates.enableTools = enableTools ? 1 : 0;
+  if (systemPrompt !== undefined) {
+    if (systemPrompt !== null && typeof systemPrompt === "string" && systemPrompt.length > 5000) {
+      return R.error("系统提示词不能超过5000字符", null);
+    }
+    updates.systemPrompt = systemPrompt;
+  }
 
   if (Object.keys(updates).length === 0) {
     return R.error("无更新内容", null);
diff --git a/server/api/agents/[agentSlug]/sessions/index.post.ts b/server/api/agents/[agentSlug]/sessions/index.post.ts
index 893a517..660eed0 100644
--- a/server/api/agents/[agentSlug]/sessions/index.post.ts
+++ b/server/api/agents/[agentSlug]/sessions/index.post.ts
@@ -44,6 +44,12 @@ export default defineWrappedResponseHandler(async (event) => {
     modelId = agent.defaultModelId;
   }
 
+  const body = await readBody(event).catch(() => ({}));
+  const systemPrompt: string | null =
+    typeof body?.systemPrompt === "string" && body.systemPrompt.trim().length > 0
+      ? body.systemPrompt.slice(0, 5000)
+      : null;
+
   const session = await createSession({
     userId: identity.userId,
     tempToken,
@@ -51,6 +57,7 @@ export default defineWrappedResponseHandler(async (event) => {
     modelId,
     enableThinking: agent.enableThinking,
     enableTools: agent.enableTools,
+    systemPrompt,
     expiresAt,
   });