diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
index 17b992d79..73970d2d6 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt
@@ -211,6 +211,7 @@ public suspend fun Command.execute(
 ): CommandExecuteResult {
     // TODO: 2020/10/18  net.mamoe.mirai.console.command.CommandManager.execute
     val chain = buildMessageChain {
+        append(CommandManager.commandPrefix)
         append(this@execute.primaryName)
         append(' ')
         append(arguments)
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/descriptor/TypeVariant.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/descriptor/TypeVariant.kt
index 81a47fc65..86761807d 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/descriptor/TypeVariant.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/descriptor/TypeVariant.kt
@@ -12,7 +12,10 @@ package net.mamoe.mirai.console.command.descriptor
 import net.mamoe.mirai.console.command.parse.CommandCall
 import net.mamoe.mirai.console.command.parse.CommandCallParser
 import net.mamoe.mirai.console.command.parse.RawCommandArgument
+import net.mamoe.mirai.message.data.MessageChain
 import net.mamoe.mirai.message.data.MessageContent
+import net.mamoe.mirai.message.data.asMessageChain
+import net.mamoe.mirai.message.data.content
 import kotlin.reflect.KType
 import kotlin.reflect.typeOf
 
@@ -45,6 +48,20 @@ public interface TypeVariant<out OutType> {
 @ExperimentalCommandDescriptors
 public object MessageContentTypeVariant : TypeVariant<MessageContent> {
     @OptIn(ExperimentalStdlibApi::class)
-    override val outType: KType = typeOf<String>()
+    override val outType: KType = typeOf<MessageContent>()
     override fun mapValue(valueParameter: MessageContent): MessageContent = valueParameter
 }
+
+@ExperimentalCommandDescriptors
+public object MessageChainTypeVariant : TypeVariant<MessageChain> {
+    @OptIn(ExperimentalStdlibApi::class)
+    override val outType: KType = typeOf<MessageChain>()
+    override fun mapValue(valueParameter: MessageContent): MessageChain = valueParameter.asMessageChain()
+}
+
+@ExperimentalCommandDescriptors
+public object ContentStringTypeVariant : TypeVariant<String> {
+    @OptIn(ExperimentalStdlibApi::class)
+    override val outType: KType = typeOf<String>()
+    override fun mapValue(valueParameter: MessageContent): String = valueParameter.content
+}
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/CommandValueArgument.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/CommandValueArgument.kt
index f9dfe4588..3f1f0e1a7 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/CommandValueArgument.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/CommandValueArgument.kt
@@ -9,10 +9,8 @@
 
 package net.mamoe.mirai.console.command.parse
 
-import net.mamoe.mirai.console.command.descriptor.ExperimentalCommandDescriptors
-import net.mamoe.mirai.console.command.descriptor.MessageContentTypeVariant
-import net.mamoe.mirai.console.command.descriptor.NoValueArgumentMappingException
-import net.mamoe.mirai.console.command.descriptor.TypeVariant
+import net.mamoe.mirai.console.command.descriptor.*
+import net.mamoe.mirai.console.util.ConsoleExperimentalApi
 import net.mamoe.mirai.message.data.MessageContent
 import kotlin.reflect.KType
 import kotlin.reflect.full.isSubtypeOf
@@ -31,7 +29,7 @@ public typealias RawCommandArgument = MessageContent
 public interface CommandArgument
 
 /**
- * @see InvariantCommandValueArgument
+ * @see DefaultCommandValueArgument
  */
 @ExperimentalCommandDescriptors
 public interface CommandValueArgument : CommandArgument {
@@ -43,13 +41,18 @@ public interface CommandValueArgument : CommandArgument {
 /**
  * The [CommandValueArgument] that doesn't vary in type (remaining [MessageContent]).
  */
+@ConsoleExperimentalApi
 @ExperimentalCommandDescriptors
-public data class InvariantCommandValueArgument(
+public data class DefaultCommandValueArgument(
     public override val value: RawCommandArgument,
 ) : CommandValueArgument {
     @OptIn(ExperimentalStdlibApi::class)
     override val type: KType = typeOf<MessageContent>()
-    override val typeVariants: List<TypeVariant<*>> = listOf(MessageContentTypeVariant)
+    override val typeVariants: List<TypeVariant<*>> = listOf(
+        MessageContentTypeVariant,
+        MessageChainTypeVariant,
+        ContentStringTypeVariant,
+    )
 }
 
 @ExperimentalCommandDescriptors
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/SpaceSeparatedCommandCallParser.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/SpaceSeparatedCommandCallParser.kt
index d5812ff66..8cb917344 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/SpaceSeparatedCommandCallParser.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/parse/SpaceSeparatedCommandCallParser.kt
@@ -18,7 +18,7 @@ public object SpaceSeparatedCommandCallParser : CommandCallParser {
         return CommandCallImpl(
             caller = caller,
             calleeName = flatten.first().content,
-            valueArguments = flatten.drop(1).map(::InvariantCommandValueArgument)
+            valueArguments = flatten.drop(1).map(::DefaultCommandValueArgument)
         )
     }