diff --git a/task-sdk/src/airflow/sdk/api/client.py b/task-sdk/src/airflow/sdk/api/client.py
index d0362ce12aa61..afaece92fab76 100644
--- a/task-sdk/src/airflow/sdk/api/client.py
+++ b/task-sdk/src/airflow/sdk/api/client.py
@@ -1062,6 +1062,12 @@ def __init__(self, message: str, *, request: httpx.Request, response: httpx.Resp
 
     detail: list[RemoteValidationError] | str | dict[str, Any] | None
 
+    def __str__(self) -> str:
+        base = super().__str__()
+        if detail := getattr(self, "detail", None):
+            return f"{base}\nDetail: {detail}"
+        return base
+
     def __reduce__(self) -> tuple[Any, ...]:
         # Needed because https://github.com/encode/httpx/pull/3108 isn't merged yet.
         return Exception.__new__, (type(self),) + self.args, self.__dict__
diff --git a/task-sdk/tests/task_sdk/api/test_client.py b/task-sdk/tests/task_sdk/api/test_client.py
index 0df8839c55f30..4d6a27baa1b65 100644
--- a/task-sdk/tests/task_sdk/api/test_client.py
+++ b/task-sdk/tests/task_sdk/api/test_client.py
@@ -175,6 +175,45 @@ def test_server_response_error_pickling(self):
         assert unpickled.response.status_code == 404
         assert unpickled.request.url == "http://error"
 
+    def test_server_response_error_str_includes_detail(self):
+        """Test that ServerResponseError string representation includes error details."""
+        responses = [
+            httpx.Response(
+                409,
+                json={"detail": {"reason": "invalid_state", "message": "TI was not in the running state"}},
+            )
+        ]
+        client = make_client_w_responses(responses)
+
+        with pytest.raises(ServerResponseError) as exc_info:
+            client.get("http://error")
+
+        err = exc_info.value
+        error_str = str(err)
+        assert "Detail:" in error_str
+        assert "invalid_state" in error_str
+
+    def test_server_response_error_str_without_detail(self):
+        """Test that ServerResponseError string without detail doesn't include Detail section."""
+        # 422 with a string detail: the string becomes the message, detail attr is None
+        responses = [httpx.Response(422, json={"detail": "Simple error"})]
+        client = make_client_w_responses(responses)
+
+        with pytest.raises(ServerResponseError) as exc_info:
+            client.get("http://error")
+
+        err = exc_info.value
+        error_str = str(err)
+        assert "Simple error" in error_str
+        # detail is None when the detail string is used as the message itself
+        assert "Detail:" not in error_str
+
+    def test_server_response_error_str_missing_detail_attr(self):
+        err = ServerResponseError.__new__(ServerResponseError)
+        err.args = ("Server returned error",)
+
+        assert "Detail:" not in str(err)
+
     def test_retry_handling_unrecoverable_error(self):
         with time_machine.travel("2023-01-01T00:00:00Z", tick=False):
             responses: list[httpx.Response] = [