diff --git a/mirai-core-api/src/commonMain/kotlin/utils/ExternalResource.kt b/mirai-core-api/src/commonMain/kotlin/utils/ExternalResource.kt
index fc3c85cb0..ac7da6cbd 100644
--- a/mirai-core-api/src/commonMain/kotlin/utils/ExternalResource.kt
+++ b/mirai-core-api/src/commonMain/kotlin/utils/ExternalResource.kt
@@ -175,6 +175,7 @@ public expect interface ExternalResource : Closeable {
      *
      * @since 2.13
      */
+    @MiraiInternalApi
     public fun input(): Input
 
     @MiraiInternalApi
diff --git a/mirai-core-api/src/jvmBaseMain/kotlin/utils/ExternalResource.kt b/mirai-core-api/src/jvmBaseMain/kotlin/utils/ExternalResource.kt
index 3f82bdc19..7e2938358 100644
--- a/mirai-core-api/src/jvmBaseMain/kotlin/utils/ExternalResource.kt
+++ b/mirai-core-api/src/jvmBaseMain/kotlin/utils/ExternalResource.kt
@@ -187,13 +187,14 @@ public actual interface ExternalResource : Closeable {
 
     /**
      * 打开 [Input]. 在返回的 [Input] 被 [关闭][Input.close] 前无法再次打开流.
+     * 注意: 此 API 不稳定, 请使用 [inputStream] 代替.
      *
      * 关闭此流不会关闭 [ExternalResource].
      * @throws IllegalStateException 当上一个流未关闭又尝试打开新的流时抛出
      *
      * @since 2.13
      */
-    @MiraiExperimentalApi
+    @MiraiInternalApi
     public actual fun input(): Input
 
     @MiraiInternalApi
diff --git a/mirai-core-api/src/nativeMain/kotlin/utils/ExternalResource.kt b/mirai-core-api/src/nativeMain/kotlin/utils/ExternalResource.kt
index 5c35b0531..07be744f9 100644
--- a/mirai-core-api/src/nativeMain/kotlin/utils/ExternalResource.kt
+++ b/mirai-core-api/src/nativeMain/kotlin/utils/ExternalResource.kt
@@ -169,6 +169,7 @@ public actual interface ExternalResource : Closeable {
      *
      * @since 2.13
      */
+    @MiraiInternalApi
     public actual fun input(): Input
 
     @MiraiInternalApi