diff --git a/06-hooks/format-code.sh b/06-hooks/format-code.sh
index 090d8d6..e59a132 100644
--- a/06-hooks/format-code.sh
+++ b/06-hooks/format-code.sh
@@ -1,44 +1,47 @@
 #!/bin/bash
 # Auto-format code before writing
 # Hook: PreToolUse:Write
+#
+# Reads the target file path from stdin JSON and runs the appropriate formatter.
+# Outputs updatedInput to pass the formatted content back.
+#
+# Compatible with: macOS, Linux, Windows (Git Bash)
 
-FILE=$1
+# Read JSON input from stdin (Claude Code hook protocol)
+INPUT=$(cat)
 
-if [ -z "$FILE" ]; then
-  echo "Usage: $0 <file_path>"
-  exit 1
+# Extract file_path using sed (compatible with all platforms)
+FILE_PATH=$(echo "$INPUT" | sed -n 's/.*"file_path"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -1)
+
+if [ -z "$FILE_PATH" ] || [ ! -f "$FILE_PATH" ]; then
+  exit 0
 fi
 
 # Detect file type and format accordingly
-case "$FILE" in
+case "$FILE_PATH" in
   *.js|*.jsx|*.ts|*.tsx)
     if command -v prettier &> /dev/null; then
-      echo "Formatting JavaScript/TypeScript file: $FILE"
-      prettier --write "$FILE"
+      prettier --write "$FILE_PATH" 2>/dev/null
     fi
     ;;
   *.py)
     if command -v black &> /dev/null; then
-      echo "Formatting Python file: $FILE"
-      black "$FILE"
+      black "$FILE_PATH" 2>/dev/null
     fi
     ;;
   *.go)
     if command -v gofmt &> /dev/null; then
-      echo "Formatting Go file: $FILE"
-      gofmt -w "$FILE"
+      gofmt -w "$FILE_PATH" 2>/dev/null
     fi
     ;;
   *.rs)
     if command -v rustfmt &> /dev/null; then
-      echo "Formatting Rust file: $FILE"
-      rustfmt "$FILE"
+      rustfmt "$FILE_PATH" 2>/dev/null
     fi
     ;;
   *.java)
     if command -v google-java-format &> /dev/null; then
-      echo "Formatting Java file: $FILE"
-      google-java-format -i "$FILE"
+      google-java-format -i "$FILE_PATH" 2>/dev/null
     fi
     ;;
 esac
diff --git a/06-hooks/log-bash.sh b/06-hooks/log-bash.sh
index 59b9efe..a6871f6 100644
--- a/06-hooks/log-bash.sh
+++ b/06-hooks/log-bash.sh
@@ -1,8 +1,21 @@
 #!/bin/bash
 # Log all bash commands
 # Hook: PostToolUse:Bash
+#
+# Reads the executed command from stdin JSON and logs it to a file.
+#
+# Compatible with: macOS, Linux, Windows (Git Bash)
+
+# Read JSON input from stdin (Claude Code hook protocol)
+INPUT=$(cat)
+
+# Extract the bash command from tool_input
+COMMAND=$(echo "$INPUT" | sed -n 's/.*"command"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -1)
+
+if [ -z "$COMMAND" ]; then
+  exit 0
+fi
 
-COMMAND="$1"
 TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
 LOGFILE="$HOME/.claude/bash-commands.log"
 
@@ -12,7 +25,4 @@ mkdir -p "$(dirname "$LOGFILE")"
 # Log the command
 echo "[$TIMESTAMP] $COMMAND" >> "$LOGFILE"
 
-# Optional: Log to system log as well
-# logger -t "claude-bash" "$COMMAND"
-
 exit 0
diff --git a/06-hooks/security-scan.sh b/06-hooks/security-scan.sh
index 58ff56c..d2b7e45 100644
--- a/06-hooks/security-scan.sh
+++ b/06-hooks/security-scan.sh
@@ -1,61 +1,67 @@
 #!/bin/bash
 # Security scan on file write
 # Hook: PostToolUse:Write
+#
+# Scans files for hardcoded secrets, API keys, and credentials.
+# Outputs a non-blocking warning via additionalContext when issues are found.
+#
+# Compatible with: macOS, Linux, Windows (Git Bash)
 
-FILE=$1
+# Read JSON input from stdin (Claude Code hook protocol)
+INPUT=$(cat)
 
-if [ -z "$FILE" ]; then
-  echo "Usage: $0 <file_path>"
+# Extract file_path using sed (compatible with all platforms including Windows Git Bash)
+# Avoids grep -P (not available on Windows Git Bash) and python3 dependency
+FILE_PATH=$(echo "$INPUT" | sed -n 's/.*"file_path"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -1)
+
+if [ -z "$FILE_PATH" ] || [ ! -f "$FILE_PATH" ]; then
   exit 0
 fi
 
-echo "🔒 Running security scan on: $FILE"
+# Skip binary files, vendor dirs, and build artifacts
+case "$FILE_PATH" in
+  *.png|*.jpg|*.jpeg|*.gif|*.svg|*.ico|*.woff|*.woff2|*.ttf|*.eot) exit 0 ;;
+  */node_modules/*|*/.git/*|*/dist/*|*/build/*) exit 0 ;;
+esac
 
-ISSUES_FOUND=0
+ISSUES=""
 
 # Check for hardcoded passwords
-if grep -qE "(password|passwd|pwd)\s*=\s*['\"][^'\"]+['\"]" "$FILE"; then
-  echo "⚠️  WARNING: Potential hardcoded password detected in $FILE"
-  ISSUES_FOUND=1
+# Handles both JSON format ("password": "value") and code format (password = 'value')
+if grep -qiE '"password"[[:space:]]*:[[:space:]]*"[^"]+"' "$FILE_PATH" 2>/dev/null; then
+  ISSUES="${ISSUES}- WARNING: Potential hardcoded password detected\n"
+elif grep -qiE '(password|passwd|pwd)\s*=\s*'"'"'[^'"'"']+'"'"'' "$FILE_PATH" 2>/dev/null; then
+  ISSUES="${ISSUES}- WARNING: Potential hardcoded password detected\n"
 fi
 
 # Check for hardcoded API keys
-if grep -qE "(api[_-]?key|apikey|access[_-]?token)\s*=\s*['\"][^'\"]+['\"]" "$FILE"; then
-  echo "⚠️  WARNING: Potential hardcoded API key detected in $FILE"
-  ISSUES_FOUND=1
-fi
-
-# Check for hardcoded secrets
-if grep -qE "(secret|token)\s*=\s*['\"][^'\"]+['\"]" "$FILE"; then
-  echo "⚠️  WARNING: Potential hardcoded secret detected in $FILE"
-  ISSUES_FOUND=1
+if grep -qiE '"(api[_-]?key|apikey|access[_-]?token)"[[:space:]]*:[[:space:]]*"[^"]+"' "$FILE_PATH" 2>/dev/null; then
+  ISSUES="${ISSUES}- WARNING: Potential hardcoded API key detected\n"
 fi
 
 # Check for private keys
-if grep -q "BEGIN.*PRIVATE KEY" "$FILE"; then
-  echo "⚠️  WARNING: Private key detected in $FILE"
-  ISSUES_FOUND=1
+if grep -q "BEGIN.*PRIVATE KEY" "$FILE_PATH" 2>/dev/null; then
+  ISSUES="${ISSUES}- WARNING: Private key detected\n"
 fi
 
 # Check for AWS keys
-if grep -qE "AKIA[0-9A-Z]{16}" "$FILE"; then
-  echo "⚠️  WARNING: AWS access key detected in $FILE"
-  ISSUES_FOUND=1
+if grep -qE "AKIA[0-9A-Z]{16}" "$FILE_PATH" 2>/dev/null; then
+  ISSUES="${ISSUES}- WARNING: AWS access key detected\n"
 fi
 
 # Scan with semgrep if available
 if command -v semgrep &> /dev/null; then
-  semgrep --config=auto "$FILE" --quiet 2>/dev/null
+  semgrep --config=auto "$FILE_PATH" --quiet 2>/dev/null
 fi
 
 # Scan with trufflehog if available
 if command -v trufflehog &> /dev/null; then
-  trufflehog filesystem "$FILE" --only-verified --quiet 2>/dev/null
+  trufflehog filesystem "$FILE_PATH" --only-verified --quiet 2>/dev/null
 fi
 
-if [ $ISSUES_FOUND -eq 0 ]; then
-  echo "✅ No security issues found"
+# If issues found, output as additionalContext (non-blocking warning)
+if [ -n "$ISSUES" ]; then
+  printf '{"additionalContext": "Security scan found issues in %s:\n%sPlease review and use environment variables instead."}' "$FILE_PATH" "$ISSUES"
 fi
 
-# Don't block the operation, just warn
 exit 0
diff --git a/06-hooks/validate-prompt.sh b/06-hooks/validate-prompt.sh
index 312bcd1..882f74e 100644
--- a/06-hooks/validate-prompt.sh
+++ b/06-hooks/validate-prompt.sh
@@ -1,11 +1,21 @@
 #!/bin/bash
 # Validate user prompts
 # Hook: UserPromptSubmit
+#
+# Reads the user prompt from stdin JSON and blocks dangerous operations.
+#
+# Compatible with: macOS, Linux, Windows (Git Bash)
 
-# Read prompt from stdin
-PROMPT=$(cat)
+# Read JSON input from stdin (Claude Code hook protocol)
+INPUT=$(cat)
 
-echo "🔍 Validating prompt..."
+# Extract the prompt text from JSON input
+# Claude Code sends: {"session_id": "...", "prompt": "user's message here"}
+PROMPT=$(echo "$INPUT" | sed -n 's/.*"prompt"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -1)
+
+if [ -z "$PROMPT" ]; then
+  exit 0
+fi
 
 # Check for dangerous operations
 DANGEROUS_PATTERNS=(
@@ -18,26 +28,24 @@ DANGEROUS_PATTERNS=(
 
 for pattern in "${DANGEROUS_PATTERNS[@]}"; do
   if echo "$PROMPT" | grep -qi "$pattern"; then
-    echo "❌ Blocked: Dangerous operation detected: $pattern"
-    exit 1
+    printf '{"decision": "block", "reason": "Dangerous operation detected: %s"}' "$pattern"
+    exit 0
   fi
 done
 
 # Check for production deployments
 if echo "$PROMPT" | grep -qiE "(deploy|push).*production"; then
   if [ ! -f ".deployment-approved" ]; then
-    echo "❌ Blocked: Production deployment requires approval"
-    echo "Create .deployment-approved file to proceed"
-    exit 1
+    echo '{"decision": "block", "reason": "Production deployment requires approval. Create .deployment-approved file to proceed."}'
+    exit 0
   fi
 fi
 
 # Check for required context in certain operations
 if echo "$PROMPT" | grep -qi "refactor"; then
-  if [ ! -f "tests/" ] && [ ! -f "test/" ]; then
-    echo "⚠️  Warning: Refactoring without tests may be risky"
+  if [ ! -d "tests" ] && [ ! -d "test" ]; then
+    printf '{"additionalContext": "Warning: Refactoring without tests may be risky. Consider writing tests first."}'
   fi
 fi
 
-echo "✅ Prompt validation passed"
 exit 0