diff --git a/backend/internal/handler/gateway_handler.go b/backend/internal/handler/gateway_handler.go
index 65836a7e..35de1bff 100644
--- a/backend/internal/handler/gateway_handler.go
+++ b/backend/internal/handler/gateway_handler.go
@@ -325,6 +325,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 			selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionKey, reqModel, fs.FailedAccountIDs, "", int64(0)) // Gemini 不使用会话限制
 			if err != nil {
 				if len(fs.FailedAccountIDs) == 0 {
+					markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 					reqLog.Warn("gateway.select_account_no_available",
 						zap.String("model", reqModel),
 						zap.Int64p("group_id", apiKey.GroupID),
@@ -374,6 +375,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 			accountReleaseFunc := selection.ReleaseFunc
 			if !selection.Acquired {
 				if selection.WaitPlan == nil {
+					markOpsRoutingCapacityLimited(c)
 					reqLog.Warn("gateway.select_account_no_slot_no_wait_plan",
 						zap.Int64("account_id", account.ID),
 						zap.String("model", reqModel),
@@ -566,6 +568,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 			selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), currentAPIKey.GroupID, sessionKey, reqModel, fs.FailedAccountIDs, parsedReq.MetadataUserID, subject.UserID)
 			if err != nil {
 				if len(fs.FailedAccountIDs) == 0 {
+					markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 					reqLog.Warn("gateway.select_account_no_available",
 						zap.String("model", reqModel),
 						zap.Int64p("group_id", currentAPIKey.GroupID),
@@ -626,6 +629,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 			accountReleaseFunc := selection.ReleaseFunc
 			if !selection.Acquired {
 				if selection.WaitPlan == nil {
+					markOpsRoutingCapacityLimited(c)
 					reqLog.Warn("gateway.select_account_no_slot_no_wait_plan",
 						zap.Int64("account_id", account.ID),
 						zap.String("model", reqModel),
@@ -1542,6 +1546,7 @@ func (h *GatewayHandler) CountTokens(c *gin.Context) {
 	account, err := h.gatewayService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, parsedReq.Model)
 	if err != nil {
 		reqLog.Warn("gateway.count_tokens_select_account_failed", zap.Error(err))
+		markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 		h.errorResponse(c, http.StatusServiceUnavailable, "api_error", "Service temporarily unavailable")
 		return
 	}
diff --git a/backend/internal/handler/gateway_handler_chat_completions.go b/backend/internal/handler/gateway_handler_chat_completions.go
index c6b73190..00c8ac37 100644
--- a/backend/internal/handler/gateway_handler_chat_completions.go
+++ b/backend/internal/handler/gateway_handler_chat_completions.go
@@ -169,6 +169,7 @@ func (h *GatewayHandler) ChatCompletions(c *gin.Context) {
 		selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionHash, reqModel, fs.FailedAccountIDs, "", int64(0))
 		if err != nil {
 			if len(fs.FailedAccountIDs) == 0 {
+				markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 				h.chatCompletionsErrorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error())
 				return
 			}
@@ -194,6 +195,7 @@ func (h *GatewayHandler) ChatCompletions(c *gin.Context) {
 		accountReleaseFunc := selection.ReleaseFunc
 		if !selection.Acquired {
 			if selection.WaitPlan == nil {
+				markOpsRoutingCapacityLimited(c)
 				h.chatCompletionsErrorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts")
 				return
 			}
diff --git a/backend/internal/handler/gateway_handler_responses.go b/backend/internal/handler/gateway_handler_responses.go
index a97f572d..b8a2af8e 100644
--- a/backend/internal/handler/gateway_handler_responses.go
+++ b/backend/internal/handler/gateway_handler_responses.go
@@ -174,6 +174,7 @@ func (h *GatewayHandler) Responses(c *gin.Context) {
 		selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionHash, reqModel, fs.FailedAccountIDs, "", int64(0))
 		if err != nil {
 			if len(fs.FailedAccountIDs) == 0 {
+				markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 				h.responsesErrorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error())
 				return
 			}
@@ -199,6 +200,7 @@ func (h *GatewayHandler) Responses(c *gin.Context) {
 		accountReleaseFunc := selection.ReleaseFunc
 		if !selection.Acquired {
 			if selection.WaitPlan == nil {
+				markOpsRoutingCapacityLimited(c)
 				h.responsesErrorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts")
 				return
 			}
diff --git a/backend/internal/handler/gemini_v1beta_handler.go b/backend/internal/handler/gemini_v1beta_handler.go
index 90ebe9ec..3395eeec 100644
--- a/backend/internal/handler/gemini_v1beta_handler.go
+++ b/backend/internal/handler/gemini_v1beta_handler.go
@@ -61,6 +61,7 @@ func (h *GatewayHandler) GeminiV1BetaListModels(c *gin.Context) {
 			c.JSON(http.StatusOK, gemini.FallbackModelsList())
 			return
 		}
+		markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 		googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
 		return
 	}
@@ -113,6 +114,7 @@ func (h *GatewayHandler) GeminiV1BetaGetModel(c *gin.Context) {
 			c.JSON(http.StatusOK, gemini.FallbackModel(modelName))
 			return
 		}
+		markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 		googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
 		return
 	}
@@ -372,6 +374,7 @@ func (h *GatewayHandler) GeminiV1BetaModels(c *gin.Context) {
 		selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionKey, modelName, fs.FailedAccountIDs, "", int64(0)) // Gemini 不使用会话限制
 		if err != nil {
 			if len(fs.FailedAccountIDs) == 0 {
+				markOpsRoutingCapacityLimitedIfNoAvailable(c, err)
 				googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
 				return
 			}
@@ -419,6 +422,7 @@ func (h *GatewayHandler) GeminiV1BetaModels(c *gin.Context) {
 		accountReleaseFunc := selection.ReleaseFunc
 		if !selection.Acquired {
 			if selection.WaitPlan == nil {
+				markOpsRoutingCapacityLimited(c)
 				googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts")
 				return
 			}