diff --git a/.github/workflows/markdown-lint.yml b/.github/workflows/markdown-lint.yml
index 01c6f00..abf9afa 100644
--- a/.github/workflows/markdown-lint.yml
+++ b/.github/workflows/markdown-lint.yml
@@ -12,6 +12,7 @@ name: Markdown Validation
       - "notes/**/*.md"
       - "schemas/**/*.json"
       - "scripts/check_markdown.py"
+      - "scripts/check_placeholders.py"
       - "scripts/check_pattern_library.py"
       - "scripts/render_readme_snapshot.py"
       - "scripts/render_tags_doc.py"
@@ -33,6 +34,7 @@ name: Markdown Validation
       - "notes/**/*.md"
       - "schemas/**/*.json"
       - "scripts/check_markdown.py"
+      - "scripts/check_placeholders.py"
       - "scripts/check_pattern_library.py"
       - "scripts/render_readme_snapshot.py"
       - "scripts/render_tags_doc.py"
@@ -74,6 +76,9 @@ jobs:
       - name: Validate pattern library contract
         run: python scripts/check_pattern_library.py
 
+      - name: Validate canonical public placeholders
+        run: python scripts/check_placeholders.py
+
       - name: Run Markdown checks
         run: python scripts/check_markdown.py