diff --git a/backend/internal/pkg/antigravity/client.go b/backend/internal/pkg/antigravity/client.go
index 9e65fd72..4f14b0e6 100644
--- a/backend/internal/pkg/antigravity/client.go
+++ b/backend/internal/pkg/antigravity/client.go
@@ -38,16 +38,25 @@ type LoadCodeAssistRequest struct {
 
 // TierInfo 账户类型信息
 type TierInfo struct {
-	ID          string `json:"id"`          // standard-tier, free-tier, g1-pro-tier, g1-ultra-tier
+	ID          string `json:"id"`          // free-tier, g1-pro-tier, g1-ultra-tier
 	Name        string `json:"name"`        // 显示名称
 	Description string `json:"description"` // 描述
 }
 
+// IneligibleTier 不符合条件的层级信息
+type IneligibleTier struct {
+	Tier *TierInfo `json:"tier,omitempty"`
+	// ReasonCode 不符合条件的原因代码，如 INELIGIBLE_ACCOUNT
+	ReasonCode    string `json:"reasonCode,omitempty"`
+	ReasonMessage string `json:"reasonMessage,omitempty"`
+}
+
 // LoadCodeAssistResponse loadCodeAssist 响应
 type LoadCodeAssistResponse struct {
-	CloudAICompanionProject string    `json:"cloudaicompanionProject"`
-	CurrentTier             *TierInfo `json:"currentTier,omitempty"`
-	PaidTier                *TierInfo `json:"paidTier,omitempty"`
+	CloudAICompanionProject string            `json:"cloudaicompanionProject"`
+	CurrentTier             *TierInfo         `json:"currentTier,omitempty"`
+	PaidTier                *TierInfo         `json:"paidTier,omitempty"`
+	IneligibleTiers         []*IneligibleTier `json:"ineligibleTiers,omitempty"`
 }
 
 // GetTier 获取账户类型
diff --git a/backend/internal/service/antigravity_quota_refresher.go b/backend/internal/service/antigravity_quota_refresher.go
index af98438c..bf3e9dde 100644
--- a/backend/internal/service/antigravity_quota_refresher.go
+++ b/backend/internal/service/antigravity_quota_refresher.go
@@ -187,6 +187,17 @@ func (r *AntigravityQuotaRefresher) updateAccountTier(account *Account, loadResp
 	if tier != "" {
 		account.Extra["tier"] = tier
 	}
+
+	// 保存不符合条件的原因（如 INELIGIBLE_ACCOUNT）
+	if len(loadResp.IneligibleTiers) > 0 && loadResp.IneligibleTiers[0] != nil {
+		ineligible := loadResp.IneligibleTiers[0]
+		if ineligible.ReasonCode != "" {
+			account.Extra["ineligible_reason_code"] = ineligible.ReasonCode
+		}
+		if ineligible.ReasonMessage != "" {
+			account.Extra["ineligible_reason_message"] = ineligible.ReasonMessage
+		}
+	}
 }
 
 // updateAccountQuota 更新账户的配额信息