diff --git a/templates/knowledge/lesson.json b/templates/knowledge/lesson.json
index de7fa7d..fb01896 100644
--- a/templates/knowledge/lesson.json
+++ b/templates/knowledge/lesson.json
@@ -1,5 +1,5 @@
 {
-  "id": "TEMPLATE-knowledge-lesson",
+  "id": "template-knowledge-lesson",
   "title": "TEMPLATE — Replace with your lesson title",
   "description": "A ready-to-validate knowledge (non-language) lesson template. For non-language content the material and the explanation share ONE language, so source_language == target_language is allowed and the set folder carries a topic name. This example uses domain: psychology. See ../README.md and ../../docs/LESSON-FORMAT.md.",
   "target_language": "de",
diff --git a/templates/language/lesson.json b/templates/language/lesson.json
index 0cdf95e..d9a1d3c 100644
--- a/templates/language/lesson.json
+++ b/templates/language/lesson.json
@@ -1,5 +1,5 @@
 {
-  "id": "TEMPLATE-language-lesson",
+  "id": "template-language-lesson",
   "title": "TEMPLATE — Replace with your lesson title",
   "description": "A ready-to-validate language lesson template. Copy this file into your set's lessons/ folder, rename it (kebab-case, matching the id), and replace the placeholder content. See ../README.md and ../../docs/LESSON-FORMAT.md for field-by-field guidance.",
   "target_language": "es",
diff --git a/templates/programming/lesson.json b/templates/programming/lesson.json
index 089af95..1648d92 100644
--- a/templates/programming/lesson.json
+++ b/templates/programming/lesson.json
@@ -1,5 +1,5 @@
 {
-  "id": "TEMPLATE-programming-lesson",
+  "id": "template-programming-lesson",
   "title": "TEMPLATE — Replace with your lesson title",
   "description": "A ready-to-validate programming lesson template. Programming is a non-language domain (source_language == target_language). Code cards use the schema v1.3 fields code_snippet, code_language, expected_output and media_type: \"code\". See ../README.md and ../../docs/LESSON-FORMAT.md.",
   "target_language": "de",