diff --git a/envsetup.sh b/envsetup.sh
index 21b5aa7..c4c4972 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -265,13 +265,6 @@
         export ANDROID_EMULATOR_PREBUILTS
     fi
 
-    # Append asuite prebuilts path to ANDROID_BUILD_PATHS.
-    local os_arch=$(get_build_var HOST_PREBUILT_TAG)
-    local ACLOUD_PATH="$T/prebuilts/asuite/acloud/$os_arch:"
-    local AIDEGEN_PATH="$T/prebuilts/asuite/aidegen/$os_arch:"
-    local ATEST_PATH="$T/prebuilts/asuite/atest/$os_arch:"
-    export ANDROID_BUILD_PATHS=$ANDROID_BUILD_PATHS$ACLOUD_PATH$AIDEGEN_PATH$ATEST_PATH
-
     export PATH=$ANDROID_BUILD_PATHS$PATH
 
     # out with the duplicate old
@@ -360,7 +353,7 @@
     local completion_files=(
       system/core/adb/adb.bash
       system/core/fastboot/fastboot.bash
-      tools/asuite/asuite.sh
+      tools/tradefederation/core/atest/atest_completion.sh
     )
     # Completion can be disabled selectively to allow users to use non-standard completion.
     # e.g.
@@ -1664,6 +1657,23 @@
     "$ANDROID_PRODUCT_OUT/provision-device" "$@"
 }
 
+function atest()
+{
+    # Let's use the built version over the prebuilt, then source code.
+    local os_arch=$(get_build_var HOST_PREBUILT_TAG)
+    local built_atest=${ANDROID_HOST_OUT}/bin/atest
+    local prebuilt_atest="$(gettop)"/prebuilts/asuite/atest/$os_arch/atest
+    if [[ -x $built_atest ]]; then
+        $built_atest "$@"
+    elif [[ -x $prebuilt_atest ]]; then
+        $prebuilt_atest "$@"
+    else
+        # TODO: once prebuilt atest released, remove the source code section
+        # and change the location of atest_completion.sh in addcompletions().
+        "$(gettop)"/tools/tradefederation/core/atest/atest.py "$@"
+    fi
+}
+
 # Zsh needs bashcompinit called to support bash-style completion.
 function enable_zsh_completion() {
     # Don't override user's options if bash-style completion is already enabled.
@@ -1688,6 +1698,40 @@
     esac
 }
 
+function acloud()
+{
+    # Let's use the built version over the prebuilt.
+    local built_acloud=${ANDROID_HOST_OUT}/bin/acloud
+    if [ -f $built_acloud ]; then
+        $built_acloud "$@"
+        return $?
+    fi
+
+    local host_os_arch=$(get_build_var HOST_PREBUILT_TAG)
+    case $host_os_arch in
+        linux-x86) "$(gettop)"/prebuilts/asuite/acloud/linux-x86/acloud "$@"
+        ;;
+        darwin-x86) "$(gettop)"/prebuilts/asuite/acloud/darwin-x86/acloud "$@"
+        ;;
+    *)
+        echo "acloud is not supported on your host arch: $host_os_arch"
+        ;;
+    esac
+}
+
+function aidegen()
+{
+    # Always use the prebuilt version.
+    local host_os_arch=$(get_build_var HOST_PREBUILT_TAG)
+    case $host_os_arch in
+        linux-x86) "$(gettop)"/prebuilts/asuite/aidegen/linux-x86/aidegen "$@"
+        ;;
+    *)
+        echo "aidegen is not supported on your host arch: $host_os_arch"
+        ;;
+    esac
+}
+
 # Execute the contents of any vendorsetup.sh files we can find.
 function source_vendorsetup() {
     for dir in device vendor product; do