diff --git a/plugins/claude-config-maintainer/hooks/enforce-rules.sh b/plugins/claude-config-maintainer/hooks/enforce-rules.sh
new file mode 100755
index 0000000..a451a1a
--- /dev/null
+++ b/plugins/claude-config-maintainer/hooks/enforce-rules.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+# claude-config-maintainer: enforce mandatory behavior rules
+# Checks if CLAUDE.md has the rules, adds them if missing
+
+PREFIX="[claude-config-maintainer]"
+
+# Find CLAUDE.md in current directory or parent
+CLAUDE_MD=""
+if [ -f "./CLAUDE.md" ]; then
+    CLAUDE_MD="./CLAUDE.md"
+elif [ -f "../CLAUDE.md" ]; then
+    CLAUDE_MD="../CLAUDE.md"
+fi
+
+# If no CLAUDE.md found, exit silently
+if [ -z "$CLAUDE_MD" ]; then
+    exit 0
+fi
+
+# Check if mandatory rules exist
+if grep -q "MANDATORY BEHAVIOR RULES" "$CLAUDE_MD" 2>/dev/null; then
+    # Rules exist, all good
+    exit 0
+fi
+
+# Rules missing - add them
+RULES='## ⛔ MANDATORY BEHAVIOR RULES - READ FIRST
+
+**These rules are NON-NEGOTIABLE. Violating them wastes the user'\''s time and money.**
+
+### 1. WHEN USER ASKS YOU TO CHECK SOMETHING - CHECK EVERYTHING
+- Search ALL locations, not just where you think it is
+- Check cache directories: `~/.claude/plugins/cache/`
+- Check installed: `~/.claude/plugins/marketplaces/`
+- Check source directories
+- **NEVER say "no" or "that'\''s not the issue" without exhaustive verification**
+
+### 2. WHEN USER SAYS SOMETHING IS WRONG - BELIEVE THEM
+- The user knows their system better than you
+- Investigate thoroughly before disagreeing
+- **Your confidence is often wrong. User'\''s instincts are often right.**
+
+### 3. NEVER SAY "DONE" WITHOUT VERIFICATION
+- Run the actual command/script to verify
+- Show the output to the user
+- **"Done" means VERIFIED WORKING, not "I made changes"**
+
+### 4. SHOW EXACTLY WHAT USER ASKS FOR
+- If user asks for messages, show the MESSAGES
+- If user asks for code, show the CODE
+- **Do not interpret or summarize unless asked**
+
+**FAILURE TO FOLLOW THESE RULES = WASTED USER TIME = UNACCEPTABLE**
+
+---
+
+'
+
+# Create temp file with rules + existing content
+{
+    head -1 "$CLAUDE_MD"
+    echo ""
+    echo "$RULES"
+    tail -n +2 "$CLAUDE_MD"
+} > "${CLAUDE_MD}.tmp"
+
+mv "${CLAUDE_MD}.tmp" "$CLAUDE_MD"
+echo "$PREFIX Added mandatory behavior rules to CLAUDE.md"
diff --git a/plugins/claude-config-maintainer/hooks/hooks.json b/plugins/claude-config-maintainer/hooks/hooks.json
new file mode 100644
index 0000000..d80c531
--- /dev/null
+++ b/plugins/claude-config-maintainer/hooks/hooks.json
@@ -0,0 +1,10 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "type": "command",
+        "command": "${CLAUDE_PLUGIN_ROOT}/hooks/enforce-rules.sh"
+      }
+    ]
+  }
+}