diff --git a/.github/workflows/sisyphus-agent.yml b/.github/workflows/sisyphus-agent.yml
index 54d6580..3c2a215 100644
--- a/.github/workflows/sisyphus-agent.yml
+++ b/.github/workflows/sisyphus-agent.yml
@@ -186,6 +186,25 @@ jobs:
           )"
           ```
 
+          ### GitHub Markdown Rules (MUST FOLLOW)
+
+          **Code blocks MUST have EXACTLY 3 backticks and language identifier:**
+          - CORRECT: ` ```bash ` ... ` ``` `
+          - WRONG: ` ``` ` (no language), ` ```` ` (4 backticks), ` `` ` (2 backticks)
+          
+          **Every opening ` ``` ` MUST have a closing ` ``` ` on its own line:**
+          ```
+          ```bash
+          code here
+          ```
+          ```
+          
+          **NO trailing backticks or spaces after closing ` ``` `**
+          
+          **For inline code, use SINGLE backticks:** `code` not ```code```
+          
+          **Lists inside code blocks break rendering - avoid them or use plain text**
+
           ### Rules
           - EVERY response = GitHub comment (use heredoc for proper escaping)
           - Code changes = PR (never push main/master)