diff --git a/plugins/monk/scripts/uninstall-monk-agent.sh b/plugins/monk/scripts/uninstall-monk-agent.sh
index 5fcab01..5d8cec6 100755
--- a/plugins/monk/scripts/uninstall-monk-agent.sh
+++ b/plugins/monk/scripts/uninstall-monk-agent.sh
@@ -194,9 +194,10 @@ remove_antigravity_mcp() {
     fi
   elif command -v python3 >/dev/null 2>&1; then
     python3 -c "
-import json
+import json, sys
+mcp_cfg = sys.argv[1]
 try:
-    with open('$mcp_cfg') as f:
+    with open(mcp_cfg) as f:
         cfg = json.load(f)
 except (OSError, ValueError):
     raise SystemExit(0)
@@ -205,10 +206,10 @@ if isinstance(servers, dict) and 'monk' in servers:
     del servers['monk']
     if not servers:
         cfg.pop('mcpServers', None)
-    with open('$mcp_cfg', 'w') as f:
+    with open(mcp_cfg, 'w') as f:
         json.dump(cfg, f, indent=2)
         f.write('\n')
-" 2>/dev/null || true
+" "$mcp_cfg" 2>/dev/null || true
   fi
 }
 
diff --git a/scripts/uninstall-monk-agent.sh b/scripts/uninstall-monk-agent.sh
index 5fcab01..5d8cec6 100755
--- a/scripts/uninstall-monk-agent.sh
+++ b/scripts/uninstall-monk-agent.sh
@@ -194,9 +194,10 @@ remove_antigravity_mcp() {
     fi
   elif command -v python3 >/dev/null 2>&1; then
     python3 -c "
-import json
+import json, sys
+mcp_cfg = sys.argv[1]
 try:
-    with open('$mcp_cfg') as f:
+    with open(mcp_cfg) as f:
         cfg = json.load(f)
 except (OSError, ValueError):
     raise SystemExit(0)
@@ -205,10 +206,10 @@ if isinstance(servers, dict) and 'monk' in servers:
     del servers['monk']
     if not servers:
         cfg.pop('mcpServers', None)
-    with open('$mcp_cfg', 'w') as f:
+    with open(mcp_cfg, 'w') as f:
         json.dump(cfg, f, indent=2)
         f.write('\n')
-" 2>/dev/null || true
+" "$mcp_cfg" 2>/dev/null || true
   fi
 }
 
diff --git a/tests/uninstall-monk-agent-antigravity-python-path.sh b/tests/uninstall-monk-agent-antigravity-python-path.sh
new file mode 100755
index 0000000..9dacb82
--- /dev/null
+++ b/tests/uninstall-monk-agent-antigravity-python-path.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env sh
+# Regression coverage for the Antigravity MCP cleanup's python3 fallback.
+# An apostrophe in HOME must be treated as data rather than interpolated into
+# generated Python source. PATH is isolated to exclude jq and force the
+# fallback under test.
+set -eu
+
+repo_root="${MONK_TEST_REPO_ROOT:-$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)}"
+fixture_src="$repo_root/tests/fixtures/start-monk-agent"
+work_dir="$(mktemp -d)"
+trap 'rm -rf "$work_dir"' EXIT HUP INT TERM
+
+if ! command -v python3 >/dev/null 2>&1; then
+  echo "python3 not available; skipping Antigravity uninstall regression" >&2
+  exit 0
+fi
+
+fake_bin="$work_dir/bin"
+mkdir -p "$fake_bin"
+for command_name in cat dirname id kill mktemp mv python3 ps rm sh tr; do
+  command_path="$(command -v "$command_name" || true)"
+  case "$command_path" in
+    /*)
+      printf '#!/usr/bin/sh\nexec "%s" "$@"\n' "$command_path" >"$fake_bin/$command_name"
+      chmod +x "$fake_bin/$command_name"
+      ;;
+  esac
+done
+printf '#!/usr/bin/sh\nexec "%s" "$@"\n' "$fixture_src/uname" >"$fake_bin/uname"
+chmod +x "$fake_bin/uname"
+
+home_root="$work_dir"
+case "$(uname -s 2>/dev/null || printf unknown)" in
+  MINGW*|MSYS*|CYGWIN*) home_root="$(cygpath -m "$work_dir")" ;;
+esac
+home="$home_root/home/O'Connor"
+config="$home/.gemini/config/mcp_config.json"
+mkdir -p "$(dirname "$config")"
+printf '%s\n' '{"mcpServers":{"monk":{"serverUrl":"http://127.0.0.1:7419/mcp"},"preserved":{"serverUrl":"http://127.0.0.1:9999/mcp"}},"preserved":{"value":"still here"}}' >"$config"
+
+HOME="$home" \
+PATH="$fake_bin" \
+MONK_AGENT_HOME="$home/.monk" \
+MONK_AGENT_INSTALL_DIR="$home/.monk/bin" \
+  /usr/bin/sh "$repo_root/scripts/uninstall-monk-agent.sh" --yes
+
+python3 -c '
+import json, sys
+
+with open(sys.argv[1], encoding="utf-8") as handle:
+    config = json.load(handle)
+
+assert "monk" not in config.get("mcpServers", {})
+assert config["mcpServers"]["preserved"] == {"serverUrl": "http://127.0.0.1:9999/mcp"}
+assert config["preserved"] == {"value": "still here"}
+' "$config"
+
+echo "Antigravity uninstall Python fallback handles apostrophes in the config path."