diff --git a/README.md b/README.md
index b4075d2..5de7f4b 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
-# ffxiv-wiki-edb-id-script
+# ffxiv-wiki-scripts
 
-Wiki bot for https://ffxiv.consolegameswiki.com that attempts to fix items in [Category:Missing EDB ID](https://ffxiv.consolegameswiki.com/wiki/Category:Missing_EDB_ID) by looking them up in Eorzea Database and adding the appropriate `id-edb` infobox parameter.
+Wiki bot scripts for https://ffxiv.consolegameswiki.com.
+
+- `bin/add-edb-ids`: Attempts to fix items in [Category:Missing EDB ID](https://ffxiv.consolegameswiki.com/wiki/Category:Missing_EDB_ID) by looking them up in Eorzea Database and adding the appropriate `id-edb` infobox parameter.
+- `bin/add-gt-ids`: The same for [Category:Missing internal ID](https://ffxiv.consolegameswiki.com/wiki/Category:Missing_EDB_ID), looking up internal IDs via [XIVAPI](https://v2.xivapi.com) and populating the `id-gt` parameter.
 
 ## Usage
 
-You'll need a recent version of Node.js (22+). Install dependencies via `npm ci`, set the `MW_USERNAME` and `MW_PASSWORD` environment variables to your account username and [bot password](https://www.mediawiki.org/wiki/Manual:Bot_passwords) respectively, then run `bin/add-edb-ids`.
+You'll need a recent version of Node.js (22+). Install dependencies via `npm ci`, set the `MW_USERNAME` and `MW_PASSWORD` environment variables to your account username and [bot password](https://www.mediawiki.org/wiki/Manual:Bot_passwords) respectively, then run the scripts in the `bin` folder.
diff --git a/bin/add-gt-ids b/bin/add-gt-ids
new file mode 100755
index 0000000..0df8cf1
--- /dev/null
+++ b/bin/add-gt-ids
@@ -0,0 +1,89 @@
+#!/usr/bin/env node
+
+import {findItemGTID} from '../lib/api/xivapi.js';
+import {getMediawikiClient} from '../lib/config.js';
+import {diff} from '../lib/util/diff.js';
+import {
+	addParameterBesideExistingParameter,
+	setEmptyParameter,
+} from '../lib/util/template-parameters.js';
+
+/**
+ * Inserts the `id-gt` item infobox parameter into the given page contents.
+ * @param {string} pageContent
+ * @param {string} gtID
+ * @returns {string}
+ */
+function insertInfoboxGTBID (pageContent, gtID) {
+	if (pageContent.includes(`id-gt = ${gtID}`)) {
+		console.log('what????', pageContent);
+		throw new Error('Page seems to already contain its own GT ID??');
+	}
+
+	let result = setEmptyParameter(pageContent, 'id-gt', gtID)
+		?? addParameterBesideExistingParameter(pageContent, 'id-gt', gtID, 'after', 'id-edb')
+		?? addParameterBesideExistingParameter(pageContent, 'id-gt', gtID, 'after', 'release')
+		?? addParameterBesideExistingParameter(pageContent, 'id-gt', gtID, 'after', 'patch');
+
+	if (result == null) {
+		throw new Error('Dunno how to insert the parameter into this page');
+	}
+	return result;
+}
+
+const mw = await getMediawikiClient();
+
+// Get pages in the "Missing internal ID" category from the main article namespace
+const itemPagesWithoutGTIDs = await mw.listCategoryPages('Category:Missing internal ID', [0], +process.env.LIMIT || 500);
+console.log('Processing', itemPagesWithoutGTIDs.length, 'item pages from [[Category:Missing internal ID]]\n');
+
+for (const {title} of itemPagesWithoutGTIDs) {
+	console.log('Page:', title);
+	// look up on XIVAPI
+	let gtID;
+	try {
+		gtID = await findItemGTID(title);
+	} catch (error) {
+		console.log('Error looking up item ID:', error);
+	}
+	if (!gtID) {
+		console.log('No ID found for this item, skipping');
+		continue;
+	}
+	console.log('GT ID:', gtID, `(https://garlandtools.org/db/#item/${encodeURIComponent(gtID)})`);
+
+	let originalText;
+	try {
+		originalText = await mw.readPage(title);
+	} catch (error) {
+		console.log('Error reading page:', error);
+		continue;
+	}
+
+	// rewrite wiki page to include id-edb infobox parameter
+	let updatedText;
+	try {
+		updatedText = insertInfoboxGTBID(originalText, gtID);
+		diff(originalText, updatedText);
+	} catch (error) {
+		console.log('Error inserting parameter:', error);
+		console.group('Bad page content:');
+		console.log(originalText);
+		console.groupEnd();
+		console.log();
+		continue;
+	}
+
+	// write the new stuff back to the wiki
+	try {
+		await mw.editPage(title, updatedText, "Add GT item ID", true);
+	} catch (error) {
+		console.error(error);
+		console.error('writes should not fail, this seems bad, dying now');
+		process.exit(1);
+	}
+	console.log('Written.');
+	console.log();
+}
+
+console.log('done!');
diff --git a/lib/api/xivapi.js b/lib/api/xivapi.js
new file mode 100644
index 0000000..012794e
--- /dev/null
+++ b/lib/api/xivapi.js
@@ -0,0 +1,25 @@
+// Escapes any quotation marks in the given string with backslashes.
+const backslashEscapeQuotes = (str) => str
+	.replace(/\\/g, '\\\\') // replace all \ with \\
+	.replace(/"/g, '\\"'); // replace all " with \"
+
+/**
+ * Gets the internal ID of the named item from XIVAPI.
+ * @param {string} name
+ * @returns {Promise<number | null>}
+ */
+export async function findItemGTID (name) {
+	const query = `Name~"${backslashEscapeQuotes(name)}"`;
+	const apiURL = `https://v2.xivapi.com/api/search?${new URLSearchParams({
+		sheets: 'Item',
+		query,
+		fields: 'Name',
+	})}`;
+	const response = await fetch(apiURL);
+	const data = await response.json();
+	if (!response.ok) {
+		throw new Error(`XIVAPI request failed: ${data.code} ${data.message}`);
+	}
+	const item = data.results.find(item => item.fields.Name.toLowerCase() === name.toLowerCase());
+	return item?.row_id ?? null;
+}