diff --git a/uninstall.sh b/uninstall.sh
new file mode 100755
index 0000000..ae8e4ad
--- /dev/null
+++ b/uninstall.sh
@@ -0,0 +1,113 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+RESET='\033[0m'
+
+PURGE=0
+
+for arg in "$@"; do
+  case "$arg" in
+    --purge)
+      PURGE=1
+      ;;
+    -h|--help)
+      printf 'Usage: %s [--purge]\n' "$0"
+      exit 0
+      ;;
+    *)
+      printf '%b[!]%b Unknown argument: %s\n' "$RED" "$RESET" "$arg" >&2
+      exit 1
+      ;;
+  esac
+done
+
+VENV_DIR=""
+if [ -n "${HERMES_VENV:-}" ] && [ -d "${HERMES_VENV:-}" ]; then
+  VENV_DIR="$HERMES_VENV"
+elif [ -d "$HOME/.hermes/hermes-agent/venv" ]; then
+  VENV_DIR="$HOME/.hermes/hermes-agent/venv"
+elif [ -d "$HOME/.hermes/hermes-agent/.venv" ]; then
+  VENV_DIR="$HOME/.hermes/hermes-agent/.venv"
+fi
+
+removed_hook=0
+restored_hook=0
+removed_patch=0
+
+if [ -z "$VENV_DIR" ]; then
+  printf '%b[—]%b No hermes venv found, skipping hook removal\n' "$YELLOW" "$RESET"
+else
+  PYTHON_BIN="$VENV_DIR/bin/python"
+  SITE_PACKAGES=""
+
+  if [ -x "$PYTHON_BIN" ]; then
+    SITE_PACKAGES="$($PYTHON_BIN -c 'import site; print(site.getsitepackages()[0])' 2>/dev/null || true)"
+  fi
+
+  if [ -z "$SITE_PACKAGES" ]; then
+    printf '%b[—]%b Could not detect site-packages, skipping hook removal\n' "$YELLOW" "$RESET"
+  else
+    SITE_CUSTOMIZE="$SITE_PACKAGES/sitecustomize.py"
+    BACKUP_FILE="$SITE_PACKAGES/sitecustomize.py.pre-hermes-claude-auth"
+
+    if [ ! -e "$SITE_CUSTOMIZE" ]; then
+      printf '%b[—]%b sitecustomize.py not found (already removed)\n' "$YELLOW" "$RESET"
+    elif grep -qF '# hermes-claude-auth managed' "$SITE_CUSTOMIZE"; then
+      if [ -e "$BACKUP_FILE" ]; then
+        mv "$BACKUP_FILE" "$SITE_CUSTOMIZE"
+        printf '%b[✓]%b Restored original sitecustomize.py from backup\n' "$GREEN" "$RESET"
+        restored_hook=1
+      else
+        rm -f "$SITE_CUSTOMIZE"
+        printf '%b[✓]%b Removed hook from %s/sitecustomize.py\n' "$GREEN" "$RESET" "$SITE_PACKAGES"
+        removed_hook=1
+      fi
+    else
+      printf '%b[—]%b sitecustomize.py not ours\n' "$YELLOW" "$RESET"
+    fi
+  fi
+fi
+
+if [ "$PURGE" -eq 1 ]; then
+  PATCH_DIR="$HOME/.hermes/patches"
+  PATCH_FILE="$PATCH_DIR/anthropic_billing_bypass.py"
+
+  if [ -e "$PATCH_FILE" ]; then
+    rm -f "$PATCH_FILE"
+    printf '%b[✓]%b Removed patch from ~/.hermes/patches/\n' "$GREEN" "$RESET"
+    removed_patch=1
+  fi
+
+  if [ -d "$PATCH_DIR" ]; then
+    empty=1
+    for entry in "$PATCH_DIR"/* "$PATCH_DIR"/.[!.]* "$PATCH_DIR"/..?*; do
+      [ -e "$entry" ] || continue
+      empty=0
+      break
+    done
+    if [ "$empty" -eq 1 ]; then
+      rmdir "$PATCH_DIR" 2>/dev/null || true
+    fi
+  fi
+fi
+
+if command -v systemctl >/dev/null 2>&1; then
+  if systemctl --user is-active --quiet hermes-gateway.service 2>/dev/null; then
+    systemctl --user restart hermes-gateway.service
+  fi
+fi
+
+printf '%bSummary:%b\n' "$GREEN" "$RESET"
+if [ "$restored_hook" -eq 1 ]; then
+  printf '  - Restored sitecustomize.py from backup\n'
+elif [ "$removed_hook" -eq 1 ]; then
+  printf '  - Removed sitecustomize.py hook\n'
+else
+  printf '  - No hook changes needed\n'
+fi
+if [ "$removed_patch" -eq 1 ]; then
+  printf '  - Removed patch file\n'
+fi