diff --git a/legacyver/legacypacket/command_output.go b/legacyver/legacypacket/command_output.go
index fdf30bf..6e78e7a 100644
--- a/legacyver/legacypacket/command_output.go
+++ b/legacyver/legacypacket/command_output.go
@@ -26,7 +26,7 @@ type CommandOutput struct {
 	SuccessCount uint32
 	// OutputMessages is a list of all output messages that should be sent to the player. Whether they are
 	// shown or not, depends on the type of the messages.
-	OutputMessages []protocol.CommandOutputMessage
+	OutputMessages []proto.CommandOutputMessage
 	// DataSet ... TODO: Find out what this is for.
 	DataSet protocol.Optional[string]
 }
diff --git a/legacyver/proto/command.go b/legacyver/proto/command.go
index 9eb9439..274867c 100644
--- a/legacyver/proto/command.go
+++ b/legacyver/proto/command.go
@@ -264,3 +264,34 @@ func CommandOriginData(r protocol.IO, x *protocol.CommandOrigin) {
 		r.Varint64(&x.PlayerUniqueID)
 	}
 }
+
+// CommandOutputMessage represents a message sent by a command that holds the output of one of the commands
+// executed.
+type CommandOutputMessage struct {
+	// Success indicates if the output message was one of a successful command execution. If set to true, the
+	// output message is by default coloured white, whereas if set to false, the message is by default
+	// coloured red.
+	Success bool
+	// Message is the message that is sent to the client in the chat window. It may either be simply a
+	// message or a translated built-in string like 'commands.tp.success.coordinates', combined with specific
+	// parameters below.
+	Message string
+	// Parameters is a list of parameters that serve to supply the message sent with additional information,
+	// such as the position that a player was teleported to or the effect that was applied to an entity.
+	// These parameters only apply for the Minecraft built-in command output.
+	Parameters []string
+}
+
+// Marshal encodes/decodes a CommandOutputMessage.
+func (x *CommandOutputMessage) Marshal(r protocol.IO) {
+	if IsProtoLT(r, ID898) {
+		r.Bool(&x.Success)
+	}
+	r.String(&x.Message)
+	if IsProtoGTE(r, ID898) {
+		r.Bool(&x.Success)
+	}
+
+	r.Bool(&x.Success)
+	protocol.FuncSlice(r, &x.Parameters, r.String)
+}