diff --git a/Scripts/lab/remote.sh b/Scripts/lab/remote.sh
index 4877e1b1b..49377d82d 100755
--- a/Scripts/lab/remote.sh
+++ b/Scripts/lab/remote.sh
@@ -1,6 +1,20 @@
 #!/bin/zsh
 set -euo pipefail
 
+# This script runs over a non-interactive SSH shell, which does not source the
+# login profile and therefore does not have Homebrew on PATH. That matters
+# because the repository configures core.hookspath, and those hooks call
+# git-lfs. A missing git-lfs makes the hook exit non-zero, and `set -e` then
+# aborts mid-command with no diagnostic: `create` died after staging its
+# archive, reporting only exit 2. Set the environment this script needs rather
+# than depending on how it was launched.
+for candidate in /opt/homebrew/bin /usr/local/bin; do
+  if [[ -d "$candidate" && ":$PATH:" != *":$candidate:"* ]]; then
+    PATH="$candidate:$PATH"
+  fi
+done
+export PATH
+
 PRODUCTION_ROOT="/Volumes/KeyPath Lab/CrabBox"
 OWNER="keypath-installer-lab-v1"
 NAMEPLATE_VERSION="0.2.5"
@@ -65,10 +79,19 @@ configure_tart_path() {
   export PATH="${usb_prefix}$LAB_ROOT/CompatTools/bin:$LAB_ROOT/SharedTools/bin:/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin"
 }
 
+# Desktop leases need the provisioned desktop base, which already carries the
+# console session, Python, and the approved Peekaboo Lab Host. Without this the
+# --desktop flag still produced a plain base, so desktop-bootstrap failed on a
+# missing Homebrew and semantic UI automation could never run. Managed lanes are
+# excluded: their base carries MDM enrollment that the desktop base does not, so
+# a managed desktop lease keeps the managed base and gains desktop capability
+# from the launcher instead.
 base_for() {
-  local macos=$1 lane=$2
+  local macos=$1 lane=$2 desktop=${3:-0}
   if [[ "$macos" == "15" ]]; then
     [[ "$lane" == "managed-functional" ]] && print keypath-macos-15-managed || print ghcr.io/cirruslabs/macos-sequoia-base:latest
+  elif [[ ("$macos" == "26" || "$macos" == "27") && "$desktop" == "1" && "$lane" != "managed-functional" ]]; then
+    print "keypath-macos-$macos-desktop"
   else
     [[ "$lane" == "managed-functional" ]] && print "keypath-macos-$macos-managed" || print "keypath-macos-$macos"
   fi
@@ -123,23 +146,36 @@ provider_capacity() {
   esac
 }
 
+# The path whose free space gates provisioning. This must be the filesystem the
+# provider actually writes clones to, which is not necessarily the boot disk:
+# Parallels stores clones under its configured VM folder, which on this host is
+# an external volume. Measuring the boot disk while clones land elsewhere let a
+# full clone pass admission and then exhaust the volume it was really using.
+disk_reserve_path() {
+  print -r -- "${KEYPATH_LAB_DISK_RESERVE_PATH:-/System/Volumes/Data}"
+}
+
 host_free_kib() {
   if [[ -n "${KEYPATH_LAB_TEST_FREE_KIB:-}" ]]; then
     print -r -- "$KEYPATH_LAB_TEST_FREE_KIB"
   else
-    df -Pk /System/Volumes/Data | awk 'NR == 2 {print $4}'
+    # Absolute paths: this guard must not depend on PATH being well-formed.
+    /bin/df -Pk "$(disk_reserve_path)" | /usr/bin/awk 'NR == 2 {print $4}'
   fi
 }
 
 assert_internal_disk_reserve() {
-  local minimum_gib=${KEYPATH_LAB_MIN_FREE_DISK_GIB:-100} free_kib minimum_kib
+  local minimum_gib=${KEYPATH_LAB_MIN_FREE_DISK_GIB:-100} free_kib minimum_kib path
   [[ "$minimum_gib" == <-> && "$minimum_gib" -gt 0 ]] || die "invalid disk reserve: $minimum_gib GiB"
+  path=$(disk_reserve_path)
   free_kib=$(host_free_kib)
-  [[ "$free_kib" == <-> ]] || die "could not determine internal free space"
+  [[ "$free_kib" == <-> ]] || die "could not determine free space for $path"
   minimum_kib=$((minimum_gib * 1024 * 1024))
-  print -u2 "disk_reserve\tfree_gib=$((free_kib / 1024 / 1024))\tminimum_gib=$minimum_gib"
+  # Report the measured path so a guard pointed at the wrong filesystem is
+  # visible in the log rather than silently passing.
+  print -u2 "disk_reserve\tfree_gib=$((free_kib / 1024 / 1024))\tminimum_gib=$minimum_gib\tpath=$path"
   if (( free_kib < minimum_kib )); then
-    print -u2 "disk_reserve_busy\tfree_gib=$((free_kib / 1024 / 1024))\tminimum_gib=$minimum_gib"
+    print -u2 "disk_reserve_busy\tfree_gib=$((free_kib / 1024 / 1024))\tminimum_gib=$minimum_gib\tpath=$path"
     return 75
   fi
 }
@@ -483,13 +519,13 @@ warmup_desktop() {
     if [[ "${USER:-}" == "clawd" ]]; then export TART_HOME="$LAB_ROOT/TartHome-clawd"; else export TART_HOME="$LAB_ROOT/TartHome"; fi
     configure_tart_path
     "$CRABBOX" warmup --provider tart --target macos --desktop \
-      --tart-image "$(base_for "$macos" "$lane")" \
+      --tart-image "$(base_for "$macos" "$lane" 1)" \
       --tart-user admin --tart-cpu 4 --tart-memory 8192 --tart-random-serial --ssh-port 22 \
       --slug "$slug" --ttl 2h
   else
     export PATH="$LAB_ROOT/SharedTools/bin:/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin"
     "$CRABBOX" warmup --provider parallels --target macos --desktop \
-      --parallels-template "$(base_for "$macos" "$lane")" --parallels-user keypathqa \
+      --parallels-template "$(base_for "$macos" "$lane" 1)" --parallels-user keypathqa \
       --parallels-work-root /Users/keypathqa/crabbox --ssh-port 22 \
       --slug "$slug" --ttl 2h
   fi
@@ -628,7 +664,7 @@ write_provisional_lease_manifest() {
     print "slug\t$slug"
     print "macos\t$macos"
     print "test_lane\t$lane"
-    print "base_name\t$(base_for "$macos" "$lane")"
+    print "base_name\t$(base_for "$macos" "$lane" "$desktop")"
     print "managed_identity_scope\t$identity_scope"
     print "provider\t$provider"
     print "archive_key\t$archive_key"
@@ -731,7 +767,7 @@ create_lease() {
     print "slug\t$slug"
     print "macos\t$macos"
     print "test_lane\t$lane"
-    print "base_name\t$(base_for "$macos" "$lane")"
+    print "base_name\t$(base_for "$macos" "$lane" "$desktop")"
     print "managed_identity_scope\t$identity_scope"
     print "provider\t$provider"
     print "archive_key\t$archive_key"
diff --git a/Scripts/lab/tests/keypath-lab-tests.sh b/Scripts/lab/tests/keypath-lab-tests.sh
index 9c630a063..5a63501f7 100755
--- a/Scripts/lab/tests/keypath-lab-tests.sh
+++ b/Scripts/lab/tests/keypath-lab-tests.sh
@@ -426,6 +426,7 @@ managed_manifest="$ROOT/KeyPathInstallerLab/leases/cbx_test26/manifest.tsv"
 grep -q $'managed_policy_result\t0' "$managed_manifest"
 grep -q $'managed_identity_scope\tshared:26262626-2626-2626-2626-262626262626' "$managed_manifest"
 grep -q $'managed-policy-rehydration' "$ROOT/KeyPathInstallerLab/leases/cbx_test26/commands.tsv"
+grep -q $'base_name\tkeypath-macos-26-managed' "$managed_manifest"
 set +e
 managed_busy_output=$(run_remote create 26 managed-functional "$archive_key" "$commit" "$checksum" KeyPath.zip 2h 0 2>&1)
 managed_busy_exit=$?
@@ -565,6 +566,12 @@ grep -q 'stop-27 cbx_test27' "$CALLS"
 
 desktop27_create=$(run_remote create 27 unmanaged-ui "$archive_key" "$commit" "$checksum" KeyPath.zip 2h 1)
 assert_contains "$desktop27_create" $'lease_id\tcbx_desktop27'
+# A desktop lease must land on the provisioned desktop base. Asserting only the
+# lease id let the base silently regress to the plain template, which has no
+# Homebrew, no console session, and no approved Peekaboo Lab Host. The recorded
+# base_name is the assertable signal here: in test mode warmup_desktop calls the
+# stub launcher without --parallels-template, so the calls log cannot show it.
+grep -q $'base_name\tkeypath-macos-27-desktop' "$ROOT/KeyPathInstallerLab/leases/cbx_desktop27/manifest.tsv"
 test_known_hosts="$TMP/known hosts/known_hosts"
 mkdir -p "$(dirname "$test_known_hosts")"
 touch "$test_known_hosts"
@@ -672,6 +679,7 @@ run_remote destroy cbx_desktop27 >/dev/null
 
 desktop26_create=$(run_remote create 26 unmanaged-ui "$archive_key" "$commit" "$checksum" KeyPath.zip 2h 1)
 assert_contains "$desktop26_create" $'lease_id\tcbx_desktop26'
+grep -q $'base_name\tkeypath-macos-26-desktop' "$ROOT/KeyPathInstallerLab/leases/cbx_desktop26/manifest.tsv"
 rfb_probe26=$(KEYPATH_LAB_TEST_SSH_KEY="$TMP/test-ssh-key" KEYPATH_LAB_TEST_CURSOR_BEFORE='10 10' KEYPATH_LAB_TEST_CURSOR_AFTER='170 130' KEYPATH_LAB_RFB_POINTER_SETTLE_SECONDS=0 run_remote rfb-pointer-probe cbx_desktop26 170 130)
 assert_contains "$rfb_probe26" $'rfb_pointer_probe\tpassed'
 assert_contains "$rfb_probe26" $'cursor_before\t10 10'
@@ -693,6 +701,16 @@ assert_contains "$invalid_resource_output" 'invalid Parallels resource id'
 [[ $(grep -c '^prlctl capture ' "$CALLS") -eq $prlctl_calls_before ]]
 run_remote destroy cbx_desktop26 >/dev/null
 
+# A managed lease that also asks for a desktop must keep the managed base: only
+# that base carries MDM enrollment. Desktop capability comes from the launcher,
+# not from swapping to the unenrolled desktop base.
+managed_desktop_create=$(run_remote create 26 managed-functional "$archive_key" "$commit" "$checksum" KeyPath.zip 2h 1)
+assert_contains "$managed_desktop_create" $'lease_id\tcbx_desktop26'
+managed_desktop_manifest="$ROOT/KeyPathInstallerLab/leases/cbx_desktop26/manifest.tsv"
+grep -q $'base_name\tkeypath-macos-26-managed' "$managed_desktop_manifest"
+grep -q $'desktop_enabled\ttrue' "$managed_desktop_manifest"
+run_remote destroy cbx_desktop26 >/dev/null
+
 desktop_create=$(run_remote create 15 unmanaged-ui "$archive_key" "$commit" "$checksum" KeyPath.zip 2h 1)
 assert_contains "$desktop_create" $'lease_id\tcbx_desktop15'
 grep -q $'status\tprovisioning' "$ROOT/KeyPathInstallerLab/leases/cbx_stale/manifest.tsv"