diff --git a/pkg/agent/loop.go b/pkg/agent/loop.go
index 693f2227b..7c774ff17 100644
--- a/pkg/agent/loop.go
+++ b/pkg/agent/loop.go
@@ -52,6 +52,8 @@ type processOptions struct {
 	NoHistory       bool   // If true, don't load session history (for heartbeat)
 }
 
+const defaultResponse = "I've completed processing but have no response to give. Increase `max_tool_iterations` in config.json."
+
 func NewAgentLoop(cfg *config.Config, msgBus *bus.MessageBus, provider providers.LLMProvider) *AgentLoop {
 	registry := NewAgentRegistry(cfg, provider)
 
@@ -260,7 +262,7 @@ func (al *AgentLoop) ProcessHeartbeat(ctx context.Context, content, channel, cha
 		Channel:         channel,
 		ChatID:          chatID,
 		UserMessage:     content,
-		DefaultResponse: "I've completed processing but have no response to give.",
+		DefaultResponse: defaultResponse,
 		EnableSummary:   false,
 		SendResponse:    false,
 		NoHistory:       true, // Don't load session history for heartbeat
@@ -326,7 +328,7 @@ func (al *AgentLoop) processMessage(ctx context.Context, msg bus.InboundMessage)
 		Channel:         msg.Channel,
 		ChatID:          msg.ChatID,
 		UserMessage:     msg.Content,
-		DefaultResponse: "I've completed processing but have no response to give.",
+		DefaultResponse: defaultResponse,
 		EnableSummary:   true,
 		SendResponse:    false,
 	})
diff --git a/pkg/config/defaults.go b/pkg/config/defaults.go
index cf799140d..6805a8bc4 100644
--- a/pkg/config/defaults.go
+++ b/pkg/config/defaults.go
@@ -16,7 +16,7 @@ func DefaultConfig() *Config {
 				Model:               "glm-4.7",
 				MaxTokens:           8192,
 				Temperature:         nil, // nil means use provider default
-				MaxToolIterations:   20,
+				MaxToolIterations:   50,
 			},
 		},
 		Bindings: []AgentBinding{},