diff --git a/changes/1393.feature.md b/changes/1393.feature.md
new file mode 100644
index 0000000000..4255243d5b
--- /dev/null
+++ b/changes/1393.feature.md
@@ -0,0 +1 @@
+Add `OptionalType` class as a new parameter type wrapper, allowing the client CLI to manage arguments of the `undefined` type.
diff --git a/changes/1393.fix.md b/changes/1393.fix.md
new file mode 100644
index 0000000000..c02810dba4
--- /dev/null
+++ b/changes/1393.fix.md
@@ -0,0 +1 @@
+Minor fixes to execute `backend.ai sesstpl create` and `backend.ai session create-from-template` commands
diff --git a/src/ai/backend/client/cli/params.py b/src/ai/backend/client/cli/params.py
index 7d80c2d43b..c9586596d3 100644
--- a/src/ai/backend/client/cli/params.py
+++ b/src/ai/backend/client/cli/params.py
@@ -5,6 +5,8 @@
 
 import click
 
+from ..types import undefined
+
 
 class ByteSizeParamType(click.ParamType):
     name = "byte"
@@ -166,3 +168,19 @@ def convert(self, arg, param, ctx):
                 return arg.split(",")
         except ValueError as e:
             self.fail(repr(e), param, ctx)
+
+
+class OptionalType(click.ParamType):
+    name = "Optional Type Wrapper"
+
+    def __init__(self, type_: type) -> None:
+        super().__init__()
+        self.type_ = type_
+
+    def convert(self, value: Any, param, ctx):
+        try:
+            if value is None or value is undefined:
+                return value
+            return self.type_(value)
+        except ValueError:
+            self.fail(f"{value!r} is not valid `{self.type_}` or `undefined`", param, ctx)
diff --git a/src/ai/backend/client/cli/session.py b/src/ai/backend/client/cli/session.py
index bbb5c24e68..1a190d314e 100644
--- a/src/ai/backend/client/cli/session.py
+++ b/src/ai/backend/client/cli/session.py
@@ -31,7 +31,7 @@
 from ..session import AsyncSession, Session
 from ..types import Undefined, undefined
 from . import events
-from .params import CommaSeparatedListType
+from .params import CommaSeparatedListType, OptionalType
 from .pretty import print_done, print_error, print_fail, print_info, print_wait, print_warn
 from .run import format_stats, prepare_env_arg, prepare_mount_arg, prepare_resource_arg
 from .ssh import container_ssh_ctx
@@ -391,6 +391,7 @@ def _create_from_template_cmd(docs: str = None):
         "--name",
         "--client-token",
         metavar="NAME",
+        type=OptionalType(str),
         default=undefined,
         help="Specify a human-readable session name. If not set, a random hex string is used.",
     )
@@ -399,6 +400,7 @@ def _create_from_template_cmd(docs: str = None):
         "--owner",
         "--owner-access-key",
         metavar="ACCESS_KEY",
+        type=OptionalType(str),
         default=undefined,
         help="Set the owner of the target session explicitly.",
     )
@@ -418,11 +420,18 @@ def _create_from_template_cmd(docs: str = None):
         default=None,
         help="Let session to be started at a specific or relative time.",
     )
-    @click.option("-i", "--image", default=undefined, help="Set compute_session image to run.")
+    @click.option(
+        "-i",
+        "--image",
+        type=OptionalType(str),
+        default=undefined,
+        help="Set compute_session image to run.",
+    )
     @click.option(
         "-c",
         "--startup-command",
         metavar="COMMAND",
+        type=OptionalType(str),
         default=undefined,
         help="Set the command to execute for batch-type sessions.",
     )
@@ -434,7 +443,7 @@ def _create_from_template_cmd(docs: str = None):
     @click.option(
         "--max-wait",
         metavar="SECONDS",
-        type=int,
+        type=OptionalType(int),
         default=undefined,
         help="The maximum duration to wait until the session starts.",
     )
@@ -469,7 +478,10 @@ def _create_from_template_cmd(docs: str = None):
     )
     # extra options
     @click.option(
-        "--tag", type=str, default=undefined, help="User-defined tag string to annotate sessions."
+        "--tag",
+        type=OptionalType(str),
+        default=undefined,
+        help="User-defined tag string to annotate sessions.",
     )
     # resource spec
     @click.option(
@@ -489,7 +501,7 @@ def _create_from_template_cmd(docs: str = None):
     @click.option(
         "--scaling-group",
         "--sgroup",
-        type=str,
+        type=OptionalType(str),
         default=undefined,
         help=(
             "The scaling group to execute session. If not specified, "
@@ -512,7 +524,7 @@ def _create_from_template_cmd(docs: str = None):
     @click.option(
         "--cluster-size",
         metavar="NUMBER",
-        type=int,
+        type=OptionalType(int),
         default=undefined,
         help="The size of cluster in number of containers.",
     )
@@ -538,7 +550,8 @@ def _create_from_template_cmd(docs: str = None):
         "-g",
         "--group",
         metavar="GROUP_NAME",
-        default=None,
+        type=OptionalType(str),
+        default=undefined,
         help=(
             "Group name where the session is spawned. "
             "User should be a member of the group to execute the code."
diff --git a/src/ai/backend/client/func/session.py b/src/ai/backend/client/func/session.py
index 5d688838b8..a242907978 100644
--- a/src/ai/backend/client/func/session.py
+++ b/src/ai/backend/client/func/session.py
@@ -358,6 +358,7 @@ async def create_from_template(
         enqueue_only: bool | Undefined = undefined,
         max_wait: int | Undefined = undefined,
         dependencies: Sequence[str] = None,  # cannot be stored in templates
+        callback_url: str | Undefined = undefined,
         no_reuse: bool | Undefined = undefined,
         image: str | Undefined = undefined,
         mounts: Union[List[str], Undefined] = undefined,
@@ -468,6 +469,8 @@ async def create_from_template(
             "bootstrap_script": bootstrap_script,
             "enqueueOnly": enqueue_only,
             "maxWaitSeconds": max_wait,
+            "dependencies": dependencies,
+            "callbackURL": callback_url,
             "reuseIfExists": not no_reuse,
             "startupCommand": startup_command,
             "owner_access_key": owner_access_key,
diff --git a/src/ai/backend/client/func/session_template.py b/src/ai/backend/client/func/session_template.py
index ff77e64764..397ceeca17 100644
--- a/src/ai/backend/client/func/session_template.py
+++ b/src/ai/backend/client/func/session_template.py
@@ -32,7 +32,8 @@ async def create(
         rqst.set_json(body)
         async with rqst.fetch() as resp:
             response = await resp.json()
-            return cls(response["id"], owner_access_key=owner_access_key)
+            template_id = ", ".join(data["id"] for data in response)
+            return cls(template_id, owner_access_key=owner_access_key)
 
     @api_function
     @classmethod
diff --git a/src/ai/backend/manager/api/session.py b/src/ai/backend/manager/api/session.py
index 636128dc27..adcc2bb97b 100644
--- a/src/ai/backend/manager/api/session.py
+++ b/src/ai/backend/manager/api/session.py
@@ -298,8 +298,8 @@ async def query_userinfo(
         return await _query_userinfo(
             conn,
             request["user"]["uuid"],
-            request["user"]["role"],
             request["keypair"]["access_key"],
+            request["user"]["role"],
             request["user"]["domain_name"],
             request["keypair"]["resource_policy"],
             params["domain"] or request["user"]["domain_name"],
@@ -384,10 +384,10 @@ async def _create(request: web.Request, params: dict[str, Any]) -> web.Response:
             tx.AliasedKey(["name", "session_name", "clientSessionToken"], default=undefined)
             >> "session_name": UndefChecker | t.Regexp(r"^(?=.{4,64}$)\w[\w.-]*\w$", re.ASCII),
             tx.AliasedKey(["image", "lang"], default=undefined): UndefChecker | t.Null | t.String,
-            tx.AliasedKey(["arch", "architecture"], default=DEFAULT_IMAGE_ARCH)
-            >> "architecture": t.String,
-            tx.AliasedKey(["type", "sessionType"], default="interactive")
-            >> "session_type": tx.Enum(SessionTypes),
+            tx.AliasedKey(["arch", "architecture"], default=undefined)
+            >> "architecture": t.String | UndefChecker,
+            tx.AliasedKey(["type", "sessionType"], default=undefined)
+            >> "session_type": tx.Enum(SessionTypes) | UndefChecker,
             tx.AliasedKey(["group", "groupName", "group_name"], default=undefined): (
                 UndefChecker | t.Null | t.String
             ),
@@ -470,7 +470,7 @@ async def create_from_template(request: web.Request, params: dict[str, Any]) ->
 
     param_from_template = {
         "image": template["spec"]["kernel"]["image"],
-        "architecture": template["spec"]["kernel"].get("architecture", DEFAULT_IMAGE_ARCH),
+        "architecture": template["spec"]["kernel"]["architecture"],
     }
     if "domain_name" in template_info:
         param_from_template["domain"] = template_info["domain_name"]
diff --git a/src/ai/backend/manager/api/session_template.py b/src/ai/backend/manager/api/session_template.py
index 527fb47dfe..9294c49f69 100644
--- a/src/ai/backend/manager/api/session_template.py
+++ b/src/ai/backend/manager/api/session_template.py
@@ -50,6 +50,7 @@ async def create(request: web.Request, params: Any) -> web.Response:
         owner_access_key if owner_access_key != requester_access_key else "*",
     )
     root_ctx: RootContext = request.app["_root.context"]
+    resp = []
     async with root_ctx.db.begin() as conn:
         user_uuid, group_id, _ = await query_userinfo(request, params, conn)
         log.debug("Params: {0}", params)
@@ -57,10 +58,10 @@ async def create(request: web.Request, params: Any) -> web.Response:
             body = json.loads(params["payload"])
         except json.JSONDecodeError:
             try:
-                body = yaml.safe_load(params["payload"])
+                body = yaml.safe_load_all(params["payload"])
             except (yaml.YAMLError, yaml.MarkedYAMLError):
                 raise InvalidAPIParameters("Malformed payload")
-        for st in body["session_templates"]:
+        for st in body:
             template_data = check_task_template(st["template"])
             template_id = uuid.uuid4().hex
             name = st["name"] if "name" in st else template_data["metadata"]["name"]
@@ -81,10 +82,12 @@ async def create(request: web.Request, params: Any) -> web.Response:
                 }
             )
             result = await conn.execute(query)
-            resp = {
-                "id": template_id,
-                "user": user_uuid if isinstance(user_uuid, str) else user_uuid.hex,
-            }
+            resp.append(
+                {
+                    "id": template_id,
+                    "user": user_uuid if isinstance(user_uuid, str) else user_uuid.hex,
+                }
+            )
             assert result.rowcount == 1
     return web.json_response(resp)