diff --git a/src/tagExists.mjs b/src/tagExists.mjs
new file mode 100644
index 0000000..ee09813
--- /dev/null
+++ b/src/tagExists.mjs
@@ -0,0 +1,33 @@
+import axios from "axios";
+
+const {
+	TAG_NAME,
+	FORGEJO_API_URL: API_URL,
+	FORGEJO_REPOSITORY: REPO,
+	FORGEJO_TOKEN: TOKEN,
+} = process.env;
+
+
+if (!TAG_NAME) {
+	console.log(`Tag name must not be blank`);
+	process.exit(1);
+};
+
+const requestURL = `${API_URL}/repos/${REPO}/tags/${TAG_NAME}`;
+
+const response = await axios.get(
+	requestURL,
+	{
+		headers: { Authorization: `token ${TOKEN}` },
+		validateStatus: () => true,
+	},
+);
+
+// We actually *want* an error when the tag exists, instead of when
+// it doesn't
+if (response.status === 200) {
+	console.log(`Tag with name "${TAG_NAME}" already exists`);
+	process.exit(1);
+};
+
+console.log(`Tag with name "${TAG_NAME}" not found, proceeding`);