diff --git a/lib/llm.py b/lib/llm.py
index 12d16f0..0d10f42 100644
--- a/lib/llm.py
+++ b/lib/llm.py
@@ -92,7 +92,7 @@ VERDICT RULES — read carefully:
 
 {style_guide}
 
-If requesting changes, tag the specific issues:
+If requesting changes, tag the specific issues using ONLY these tags (do not invent new tags):
 <!-- ISSUES: tag1, tag2 -->
 
 Valid tags: broken_wiki_links, frontmatter_schema, title_overclaims, confidence_miscalibration, date_errors, factual_discrepancy, near_duplicate, scope_error
@@ -120,9 +120,11 @@ Review this PR. For EACH criterion below, write one sentence stating what you fo
 
 {style_guide}
 
-If requesting changes, tag the issues:
+If requesting changes, tag the specific issues using ONLY these tags (do not invent new tags):
 <!-- ISSUES: tag1, tag2 -->
 
+Valid tags: broken_wiki_links, frontmatter_schema, title_overclaims, confidence_miscalibration, date_errors, factual_discrepancy, near_duplicate, scope_error
+
 End your review with exactly one of:
 <!-- VERDICT:LEO:APPROVE -->
 <!-- VERDICT:LEO:REQUEST_CHANGES -->
@@ -150,9 +152,11 @@ Review this PR with MAXIMUM scrutiny. This PR may trigger belief cascades. Check
 
 {style_guide}
 
-If requesting changes, tag the issues:
+If requesting changes, tag the specific issues using ONLY these tags (do not invent new tags):
 <!-- ISSUES: tag1, tag2 -->
 
+Valid tags: broken_wiki_links, frontmatter_schema, title_overclaims, confidence_miscalibration, date_errors, factual_discrepancy, near_duplicate, scope_error
+
 End your review with exactly one of:
 <!-- VERDICT:LEO:APPROVE -->
 <!-- VERDICT:LEO:REQUEST_CHANGES -->