diff --git a/src/delega/__init__.py b/src/delega/__init__.py
index a46b3c0..dc0f569 100644
--- a/src/delega/__init__.py
+++ b/src/delega/__init__.py
@@ -1,5 +1,6 @@
 """Delega Python SDK - Official client for the Delega API."""
 
+from ._version import __version__
 from .client import Delega
 from .exceptions import (
     DelegaAPIError,
@@ -11,8 +12,6 @@
 from .models import Agent, Comment, Project, Task
 from .webhooks import verify_webhook
 
-__version__ = "0.1.2"
-
 __all__ = [
     "Agent",
     "AsyncDelega",
diff --git a/src/delega/_http.py b/src/delega/_http.py
index ea52698..71ddfbd 100644
--- a/src/delega/_http.py
+++ b/src/delega/_http.py
@@ -8,6 +8,7 @@
 import urllib.request
 from typing import Any, Optional
 
+from ._version import USER_AGENT
 from .exceptions import (
     DelegaAPIError,
     DelegaAuthError,
@@ -64,6 +65,7 @@ def _headers(self) -> dict[str, str]:
             "X-Agent-Key": self._api_key,
             "Content-Type": "application/json",
             "Accept": "application/json",
+            "User-Agent": USER_AGENT,
         }
 
     def request(
diff --git a/src/delega/_version.py b/src/delega/_version.py
new file mode 100644
index 0000000..844697c
--- /dev/null
+++ b/src/delega/_version.py
@@ -0,0 +1,4 @@
+"""Package version metadata."""
+
+__version__ = "0.1.2"
+USER_AGENT = f"delega-python/{__version__}"
diff --git a/src/delega/async_client.py b/src/delega/async_client.py
index 28bd203..1c25b5a 100644
--- a/src/delega/async_client.py
+++ b/src/delega/async_client.py
@@ -14,6 +14,7 @@
     DelegaRateLimitError,
 )
 from .models import Agent, Comment, Project, Task
+from ._version import USER_AGENT
 
 _DEFAULT_BASE_URL = "https://api.delega.dev"
 
@@ -43,6 +44,7 @@ def __init__(self, base_url: str, api_key: str, timeout: int = 30) -> None:
                 "X-Agent-Key": api_key,
                 "Content-Type": "application/json",
                 "Accept": "application/json",
+                "User-Agent": USER_AGENT,
             },
             timeout=timeout,
         )
diff --git a/tests/test_client.py b/tests/test_client.py
index 3aa8531..c03696e 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -20,6 +20,7 @@
     Project,
     Task,
 )
+from delega._version import USER_AGENT
 
 
 def _mock_response(data: Any, status: int = 200) -> MagicMock:
@@ -388,6 +389,21 @@ def test_auth_header(self, mock_urlopen: MagicMock) -> None:
         request = mock_urlopen.call_args[0][0]
         self.assertEqual(request.get_header("X-agent-key"), "dlg_mykey123")
         self.assertEqual(request.get_header("Content-type"), "application/json")
+        self.assertEqual(request.get_header("User-agent"), USER_AGENT)
+
+    @patch("delega.async_client._require_httpx")
+    def test_async_client_sets_user_agent(self, mock_require_httpx: MagicMock) -> None:
+        fake_httpx = MagicMock()
+        fake_async_client = MagicMock()
+        fake_httpx.AsyncClient = fake_async_client
+        mock_require_httpx.return_value = fake_httpx
+
+        from delega.async_client import AsyncDelega
+
+        AsyncDelega(api_key="dlg_async")
+
+        _, kwargs = fake_async_client.call_args
+        self.assertEqual(kwargs["headers"]["User-Agent"], USER_AGENT)
 
 
 class TestModels(unittest.TestCase):