diff --git a/includes/Extensions/Batch16.php b/includes/Extensions/Batch16.php
new file mode 100644
index 0000000..59002a2
--- /dev/null
+++ b/includes/Extensions/Batch16.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * Batch 16 — WPML write/deep (Pro-equivalent, net-new).
+ *
+ * Writes that complement b4's read/audit WPML tools: set a post's language,
+ * create a translation copy into a target language, and connect two posts into
+ * one translation group. Uses the official WPML filter/action API.
+ * Guarded by ICL_SITEPRESS_VERSION — inert unless WPML is active.
+ * GPL-2.0-or-later. See NOTICE.md.
+ */
+
+namespace AskTamMCP\Extensions;
+
+defined('ABSPATH') || exit;
+
+class Batch16 {
+
+    public static function register($registry): void {
+        if (!defined('ICL_SITEPRESS_VERSION')) return;
+
+        $def = function (string $name, string $desc, array $props, array $required, string $scope, string $method) {
+            $schema = ['type' => 'object', 'properties' => $props];
+            if ($required) $schema['required'] = $required;
+            return ['name' => $name, 'description' => $desc, 'scope' => $scope,
+                    'handler' => 'AskTamMCP\\Extensions\\Batch16::' . $method, 'inputSchema' => $schema];
+        };
+
+        $registry->register($def('wpml_set_post_language', 'Set (or change) the WPML language of a post. Optionally join an existing translation group via trid and source language.',
+            ['post_id' => ['type' => 'integer'], 'language_code' => ['type' => 'string'],
+             'trid' => ['type' => 'integer'], 'source_language' => ['type' => 'string']],
+            ['post_id', 'language_code'], 'write', 'setLanguage'));
+
+        $registry->register($def('wpml_copy_to_language', 'Create a translation of a post into a target language (copies title/content/type/status) and links it to the source translation group. Returns the new post id.',
+            ['source_id' => ['type' => 'integer'], 'target_language' => ['type' => 'string'], 'status' => ['type' => 'string', 'enum' => ['publish', 'draft']]],
+            ['source_id', 'target_language'], 'write', 'copyToLanguage'));
+
+        $registry->register($def('wpml_connect_translation', 'Connect an existing post as the translation of a source post (joins the source trid) in the given language.',
+            ['source_id' => ['type' => 'integer'], 'translated_id' => ['type' => 'integer'], 'language_code' => ['type' => 'string']],
+            ['source_id', 'translated_id', 'language_code'], 'write', 'connect'));
+    }
+
+    private static function etype(int $postId): string {
+        return 'post_' . get_post_type($postId);
+    }
+
+    private static function trid(int $postId): ?int {
+        $trid = apply_filters('wpml_element_trid', null, $postId, self::etype($postId));
+        return $trid ? (int) $trid : null;
+    }
+
+    private static function langOf(int $postId): ?string {
+        $d = apply_filters('wpml_element_language_code', null, ['element_id' => $postId, 'element_type' => self::etype($postId)]);
+        return $d ?: null;
+    }
+
+    public static function setLanguage(array $args): array {
+        $id = (int) ($args['post_id'] ?? 0);
+        if (!get_post($id)) throw new \RuntimeException('Post not found: ' . $id);
+        $lang = (string) ($args['language_code'] ?? '');
+        if ($lang === '') throw new \RuntimeException('language_code required.');
+        $args_set = [
+            'element_id' => $id,
+            'element_type' => self::etype($id),
+            'trid' => isset($args['trid']) ? (int) $args['trid'] : self::trid($id),
+            'language_code' => $lang,
+            'source_language_code' => $args['source_language'] ?? null,
+        ];
+        do_action('wpml_set_element_language_details', $args_set);
+        return ['post_id' => $id, 'language_code' => self::langOf($id), 'trid' => self::trid($id)];
+    }
+
+    public static function copyToLanguage(array $args): array {
+        $src = (int) ($args['source_id'] ?? 0);
+        $p = get_post($src);
+        if (!$p) throw new \RuntimeException('Source post not found: ' . $src);
+        $target = (string) ($args['target_language'] ?? '');
+        if ($target === '') throw new \RuntimeException('target_language required.');
+        $status = ($args['status'] ?? 'draft') === 'publish' ? 'publish' : 'draft';
+
+        $newId = wp_insert_post([
+            'post_title'   => $p->post_title,
+            'post_content' => $p->post_content,
+            'post_excerpt' => $p->post_excerpt,
+            'post_type'    => $p->post_type,
+            'post_status'  => $status,
+        ], true);
+        if (is_wp_error($newId)) throw new \RuntimeException('Copy failed: ' . $newId->get_error_message());
+
+        $srcLang = self::langOf($src);
+        $trid = self::trid($src);
+        do_action('wpml_set_element_language_details', [
+            'element_id' => $newId,
+            'element_type' => 'post_' . $p->post_type,
+            'trid' => $trid,
+            'language_code' => $target,
+            'source_language_code' => $srcLang,
+        ]);
+        return ['source_id' => $src, 'new_id' => $newId, 'language_code' => self::langOf($newId), 'trid' => self::trid($newId), 'status' => $status];
+    }
+
+    public static function connect(array $args): array {
+        $src = (int) ($args['source_id'] ?? 0);
+        $tr  = (int) ($args['translated_id'] ?? 0);
+        if (!get_post($src) || !get_post($tr)) throw new \RuntimeException('Source or translated post not found.');
+        $lang = (string) ($args['language_code'] ?? '');
+        if ($lang === '') throw new \RuntimeException('language_code required.');
+        $trid = self::trid($src);
+        if (!$trid) throw new \RuntimeException('Source has no WPML trid; set its language first.');
+        do_action('wpml_set_element_language_details', [
+            'element_id' => $tr,
+            'element_type' => 'post_' . get_post_type($tr),
+            'trid' => $trid,
+            'language_code' => $lang,
+            'source_language_code' => self::langOf($src),
+        ]);
+        return ['source_id' => $src, 'translated_id' => $tr, 'trid' => $trid, 'language_code' => self::langOf($tr)];
+    }
+}