Context Window Warning (#152)

* context window warning & compact command

* auto compact

* fix permissions

* update readme

* fix 3.5 context window

* small update

* remove unused interface

* remove unused msg

scripts/check_hidden_chars.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Script to check for hidden/invisible characters in Go files
+# This helps detect potential prompt injection attempts
+
+echo "Checking Go files for hidden characters..."
+
+# Find all Go files in the repository
+go_files=$(find . -name "*.go" -type f)
+
+# Counter for files with hidden characters
+files_with_hidden=0
+
+for file in $go_files; do
+  # Check for specific Unicode hidden characters that could be used for prompt injection
+  # This excludes normal whitespace like tabs and newlines
+  # Looking for:
+  # - Zero-width spaces (U+200B)
+  # - Zero-width non-joiners (U+200C)
+  # - Zero-width joiners (U+200D)
+  # - Left-to-right/right-to-left marks (U+200E, U+200F)
+  # - Bidirectional overrides (U+202A-U+202E)
+  # - Byte order mark (U+FEFF)
+  if hexdump -C "$file" | grep -E 'e2 80 8b|e2 80 8c|e2 80 8d|e2 80 8e|e2 80 8f|e2 80 aa|e2 80 ab|e2 80 ac|e2 80 ad|e2 80 ae|ef bb bf' > /dev/null 2>&1; then
+    echo "Hidden characters found in: $file"
+    
+    # Show the file with potential issues
+    echo "  Hexdump showing suspicious characters:"
+    hexdump -C "$file" | grep -E 'e2 80 8b|e2 80 8c|e2 80 8d|e2 80 8e|e2 80 8f|e2 80 aa|e2 80 ab|e2 80 ac|e2 80 ad|e2 80 ae|ef bb bf' | head -10
+    
+    files_with_hidden=$((files_with_hidden + 1))
+  fi
+done
+
+if [ $files_with_hidden -eq 0 ]; then
+  echo "No hidden characters found in any Go files."
+else
+  echo "Found hidden characters in $files_with_hidden Go file(s)."
+fi
+
+exit $files_with_hidden  # Exit with number of affected files as status code