Create initial revision on post creation to match WordPress admin behavior

features/post.feature

@@ -545,3 +545,26 @@ Feature: Manage WordPress posts
       """
       {"block_version":1}
       """
+
+  Scenario: Creating a post should create an initial revision
+    When I run `wp post create --post_title='Original Title' --post_content='Original content' --post_status=publish --porcelain`
+    Then STDOUT should be a number
+    And save STDOUT as {POST_ID}
+
+    When I run `wp post list --post_type=revision --post_parent={POST_ID} --format=count`
+    Then STDOUT should be:
+      """
+      1
+      """
+
+    When I run `wp post update {POST_ID} --post_title='Updated Title'`
+    Then STDOUT should contain:
+      """
+      Success: Updated post {POST_ID}.
+      """
+
+    When I run `wp post list --post_type=revision --post_parent={POST_ID} --format=count`
+    Then STDOUT should be:
+      """
+      2
+      """

src/Post_Command.php

@@ -212,7 +212,15 @@ public function create( $args, $assoc_args ) {
 			$args,
 			$assoc_args,
 			function ( $params ) {
-				return wp_insert_post( $params, true );
+				$post_id = wp_insert_post( $params, true );
+
+				if ( ! is_wp_error( $post_id ) ) {
+					// Create initial revision to match WordPress admin behavior.
+					// This ensures the original content can be restored if the post is later edited.
+					wp_save_post_revision( $post_id );
+				}
+
+				return $post_id;
 			}
 		);
 	}