Fix infinite loop in message tool and fix compilation error on main branch.

pkg/agent/instance.go

@@ -102,13 +102,11 @@ func NewAgentInstance(
 		toolsRegistry.Register(tools.NewListDirTool(workspace, readRestrict, allowReadPaths))
 	}
 	if cfg.Tools.IsToolEnabled("exec") {
-		execTool, err := tools.NewExecToolWithDenyPaths(workspace, restrict, [][]*regexp.Regexp{allowReadPaths}, denyWritePaths, cfg)
+		execTool, err := tools.NewExecToolWithConfig(workspace, restrict, cfg, allowReadPaths)
 		if err != nil {
 			logger.ErrorCF("agent", "Failed to initialize exec tool; continuing without exec",
 				map[string]any{"error": err.Error()})
-			execTool = nil
-		}
-		if execTool != nil {
+		} else {
 			toolsRegistry.Register(execTool)
 		}
 	}

pkg/agent/loop_test.go

@@ -3693,8 +3693,8 @@ func TestProcessMessage_MessageToolPublishesOutboundWithTurnMetadata(t *testing.
 	if err != nil {
 		t.Fatalf("processMessage() error = %v", err)
 	}
-	if response == "" {
-		t.Fatal("expected processMessage() to return a final loop response")
+	if response != "" {
+		t.Fatalf("expected empty loop response when tool handles delivery, got %q", response)
 	}
 
 	select {

pkg/tools/integration/message.go

@@ -137,7 +137,8 @@ func (t *MessageTool) Execute(ctx context.Context, args map[string]any) *ToolRes
 
 	// Silent: user already received the message directly
 	return &ToolResult{
-		ForLLM: fmt.Sprintf("Message sent to %s:%s", channel, chatID),
-		Silent: true,
+		ForLLM:          fmt.Sprintf("Message sent to %s:%s", channel, chatID),
+		Silent:          true,
+		ResponseHandled: true,
 	}
 }