diff --git a/stacklet/client/platform/client.py b/stacklet/client/platform/client.py
index e651d2f..05d153c 100644
--- a/stacklet/client/platform/client.py
+++ b/stacklet/client/platform/client.py
@@ -11,7 +11,7 @@
 from .config import DEFAULT_CONFIG_FILE
 from .context import StackletContext
 from .executor import StackletGraphqlExecutor
-from .utils import _PAGINATION_OPTIONS
+from .utils import PAGINATION_OPTIONS
 
 
 def platform_client(pager=False, expr=False):
@@ -78,14 +78,14 @@ def _method(executor, function_name, snippet, pager, expr):
         doc.append("")
     if snippet.pagination:
         doc.append("pagination: ")
-        for p in _PAGINATION_OPTIONS:
+        for p in PAGINATION_OPTIONS:
             doc.append(f" - {p}")
         doc.append("")
     doc = "\n".join(doc)
 
     defaults = {}
     if snippet.pagination:
-        for k, v in _PAGINATION_OPTIONS.items():
+        for k, v in PAGINATION_OPTIONS.items():
             defaults[k] = v["default"]
     for k, v in snippet.optional.items():
         defaults[k] = None
diff --git a/stacklet/client/platform/commands/cube.py b/stacklet/client/platform/commands/cube.py
index a44b418..caf02ef 100644
--- a/stacklet/client/platform/commands/cube.py
+++ b/stacklet/client/platform/commands/cube.py
@@ -14,6 +14,7 @@
 
 from ..context import StackletContext
 from ..exceptions import MissingToken
+from ..utils import get_user_agent
 
 
 @click.group()
@@ -71,6 +72,7 @@ def _request(context: StackletContext, method: str, path: str, payload: Any = No
         headers={
             "Authorization": f"Bearer {token}",
             "Content-Type": "application/json",
+            "User-Agent": get_user_agent(),
         },
         json=payload,
     )
diff --git a/stacklet/client/platform/executor.py b/stacklet/client/platform/executor.py
index 90e8460..6f14008 100644
--- a/stacklet/client/platform/executor.py
+++ b/stacklet/client/platform/executor.py
@@ -9,7 +9,7 @@
 from .context import StackletContext
 from .exceptions import MissingToken
 from .registry import PluginRegistry
-from .utils import _PAGINATION_OPTIONS, wrap_command
+from .utils import PAGINATION_OPTIONS, get_user_agent, wrap_command
 
 
 class StackletGraphqlExecutor:
@@ -31,6 +31,7 @@ def __init__(self, context: StackletContext):
         self.session.headers.update(
             {
                 "Authorization": f"Bearer {token}",
+                "User-Agent": get_user_agent(),
             }
         )
 
@@ -54,7 +55,7 @@ def wrapper(func):
         func = wrap_command(func, snippet.required, required=True)
         func = wrap_command(func, snippet.optional)
         if snippet.pagination:
-            func = wrap_command(func, _PAGINATION_OPTIONS)
+            func = wrap_command(func, PAGINATION_OPTIONS)
         return func
 
     return wrapper
diff --git a/stacklet/client/platform/utils.py b/stacklet/client/platform/utils.py
index f9496f2..27e83b8 100644
--- a/stacklet/client/platform/utils.py
+++ b/stacklet/client/platform/utils.py
@@ -1,6 +1,7 @@
 # Copyright Stacklet, Inc.
 # SPDX-License-Identifier: Apache-2.0
 
+import importlib.metadata
 import logging
 from pathlib import Path
 
@@ -16,7 +17,7 @@ def expand_user_path(ctx, param, value):
     return value.expanduser()
 
 
-_PAGINATION_OPTIONS = {
+PAGINATION_OPTIONS = {
     "first": {
         "help": "For use with pagination. Return the first n results.",
         "default": 20,
@@ -78,3 +79,9 @@ def setup_logging(level):
     root_handler = logging.getLogger()
     if level:
         root_handler.setLevel(level=get_log_level(level))
+
+
+def get_user_agent():
+    package = "stacklet.client.platform"
+    version = importlib.metadata.version(package)
+    return f"{package}/{version}"