diff --git a/openhands-sdk/openhands/sdk/conversation/base.py b/openhands-sdk/openhands/sdk/conversation/base.py
index 1a400356f6..154814df93 100644
--- a/openhands-sdk/openhands/sdk/conversation/base.py
+++ b/openhands-sdk/openhands/sdk/conversation/base.py
@@ -29,6 +29,14 @@
 from openhands.sdk.workspace.base import BaseWorkspace
 
 
+def _conversation_tag_attributes(
+    tags: Mapping[str, str] | None,
+) -> dict[str, str] | None:
+    if not tags:
+        return None
+    return {f"conversation.tags.{key}": value for key, value in tags.items()}
+
+
 if TYPE_CHECKING:
     from openhands.sdk.agent.base import AgentBase
     from openhands.sdk.conversation.state import ConversationExecutionStatus
@@ -134,6 +142,7 @@ def _start_observability_span(
         user_id: str | None = None,
         metadata: dict[str, TraceMetadataValue] | None = None,
         tags: list[str] | None = None,
+        conversation_tags: Mapping[str, str] | None = None,
     ) -> None:
         """Start a per-conversation observability root span.
 
@@ -142,6 +151,7 @@ def _start_observability_span(
             user_id: Optional user ID to associate with the trace
             metadata: Optional trace-level metadata to attach to observability backends
             tags: Optional span tags to attach to the conversation root span
+            conversation_tags: Optional conversation tags to add as root span attributes
         """
         if not should_enable_observability():
             return
@@ -154,6 +164,7 @@ def _start_observability_span(
             user_id=user_id,
             metadata=metadata,
             tags=tags,
+            attributes=_conversation_tag_attributes(conversation_tags),
         )
 
     def _end_observability_span(self) -> None:
diff --git a/openhands-sdk/openhands/sdk/conversation/impl/local_conversation.py b/openhands-sdk/openhands/sdk/conversation/impl/local_conversation.py
index 9c957aa026..580312a90d 100644
--- a/openhands-sdk/openhands/sdk/conversation/impl/local_conversation.py
+++ b/openhands-sdk/openhands/sdk/conversation/impl/local_conversation.py
@@ -386,6 +386,7 @@ def _default_callback(e):
             user_id=user_id,
             metadata=observability_metadata,
             tags=observability_tags,
+            conversation_tags=tags,
         )
         self.delete_on_close = delete_on_close
 
diff --git a/openhands-sdk/openhands/sdk/conversation/impl/remote_conversation.py b/openhands-sdk/openhands/sdk/conversation/impl/remote_conversation.py
index 9eb997936c..2c010d7dcb 100644
--- a/openhands-sdk/openhands/sdk/conversation/impl/remote_conversation.py
+++ b/openhands-sdk/openhands/sdk/conversation/impl/remote_conversation.py
@@ -805,6 +805,8 @@ def __init__(
                 else [],
                 "user_id": user_id,
             }
+            if user_id:
+                payload["user_id"] = user_id
             if stuck_detection_thresholds is not None:
                 # Convert to StuckDetectionThresholds if dict, then serialize
                 if isinstance(stuck_detection_thresholds, Mapping):
@@ -974,6 +976,7 @@ def run_complete_callback(event: Event) -> None:
             user_id=user_id,
             metadata=observability_metadata,
             tags=observability_tags,
+            conversation_tags=tags,
         )
         # All hooks (including SessionStart/SessionEnd) are executed server-side.
         # hook_config is sent in the creation payload.
diff --git a/openhands-sdk/openhands/sdk/observability/laminar.py b/openhands-sdk/openhands/sdk/observability/laminar.py
index 328e3f26dc..7f9ed4bfaa 100644
--- a/openhands-sdk/openhands/sdk/observability/laminar.py
+++ b/openhands-sdk/openhands/sdk/observability/laminar.py
@@ -4,7 +4,7 @@
 import functools
 import inspect
 import sys
-from collections.abc import Callable, Iterator
+from collections.abc import Callable, Iterator, Mapping
 from typing import TYPE_CHECKING, Any, Final, Literal, cast
 
 from openhands.sdk.logger import get_logger
@@ -255,6 +255,7 @@ def __init__(
         name: str,
         session_id: str | None = None,
         user_id: str | None = None,
+        attributes: Mapping[str, str] | None = None,
         metadata: dict[str, TraceMetadataValue] | None = None,
         tags: list[str] | None = None,
     ) -> None:
@@ -263,6 +264,10 @@ def __init__(
         # ``start_span`` returns a span without attaching it as the current
         # OTel context; we'll restore it on every entry point via ``use_span``.
         self.span = Laminar.start_span(name)
+        if attributes:
+            with contextlib.suppress(Exception):
+                for key, value in attributes.items():
+                    self.span.set_attribute(key, value)
         if session_id or user_id or metadata or tags:
             # These trace/span helpers require an active span; briefly enter
             # the span context to apply conversation-level observability data.
@@ -300,6 +305,7 @@ def start_root_span(
     name: str,
     session_id: str | None = None,
     user_id: str | None = None,
+    attributes: Mapping[str, str] | None = None,
     metadata: dict[str, TraceMetadataValue] | None = None,
     tags: list[str] | None = None,
 ) -> RootSpan | None:
@@ -314,6 +320,7 @@ def start_root_span(
             name,
             session_id=session_id,
             user_id=user_id,
+            attributes=attributes,
             metadata=metadata,
             tags=tags,
         )
diff --git a/tests/sdk/conversation/test_base_span_management.py b/tests/sdk/conversation/test_base_span_management.py
index 7cf66fd08f..229fa9c844 100644
--- a/tests/sdk/conversation/test_base_span_management.py
+++ b/tests/sdk/conversation/test_base_span_management.py
@@ -100,6 +100,7 @@ def test_base_conversation_span_management():
             user_id=None,
             metadata=None,
             tags=None,
+            attributes=None,
         )
         assert conversation._span_ended is False
         assert conversation._observability_root_span is fake_root
@@ -121,7 +122,8 @@ def test_base_conversation_span_management():
         assert conversation._span_ended is True
 
 
-def test_base_conversation_passes_observability_metadata():
+def test_base_conversation_passes_observability_metadata_and_tag_attributes():
+    """Conversation metadata, span tags, and conversation tags reach the root span."""
     conversation = MockConversation()
 
     with (
@@ -134,18 +136,27 @@ def test_base_conversation_passes_observability_metadata():
         metadata: dict[str, TraceMetadataValue] = {
             "repo_name": "OpenHands/software-agent-sdk"
         }
-        tags = ["repo:OpenHands/software-agent-sdk"]
+        span_tags = ["repo:OpenHands/software-agent-sdk"]
+        conversation_tags = {"automationid": "auto-1", "automationrunid": "run-1"}
 
         conversation._start_observability_span(
-            "test-session-id", metadata=metadata, tags=tags
+            "test-session-id",
+            user_id="user-42",
+            metadata=metadata,
+            tags=span_tags,
+            conversation_tags=conversation_tags,
         )
 
         mock_start_span.assert_called_once_with(
             "conversation",
             session_id="test-session-id",
-            user_id=None,
+            user_id="user-42",
             metadata=metadata,
-            tags=tags,
+            tags=span_tags,
+            attributes={
+                "conversation.tags.automationid": "auto-1",
+                "conversation.tags.automationrunid": "run-1",
+            },
         )
 
 
diff --git a/tests/sdk/conversation/test_conversation_factory.py b/tests/sdk/conversation/test_conversation_factory.py
index 244c0d112e..9473394059 100644
--- a/tests/sdk/conversation/test_conversation_factory.py
+++ b/tests/sdk/conversation/test_conversation_factory.py
@@ -102,6 +102,26 @@ def test_conversation_factory_forwards_remote_parameters(
     assert conversation.max_iteration_per_run == 200
 
 
+@patch("openhands.sdk.conversation.impl.remote_conversation.WebSocketCallbackClient")
+def test_conversation_factory_forwards_remote_user_id_to_create_payload(
+    mock_ws_client, agent, remote_workspace
+):
+    """RemoteConversation must send user_id to the agent-server create request."""
+    conversation = Conversation(
+        agent=agent,
+        workspace=remote_workspace,
+        tags={"automationid": "auto-1"},
+        user_id="user-42",
+    )
+
+    assert isinstance(conversation, RemoteConversation)
+    create_call = remote_workspace._client.request.call_args_list[0]
+    assert create_call.args[:2] == ("POST", "/api/conversations")
+    payload = create_call.kwargs["json"]
+    assert payload["user_id"] == "user-42"
+    assert payload["tags"] == {"automationid": "auto-1"}
+
+
 def test_conversation_factory_string_workspace_creates_local(agent):
     """Test that string workspace creates LocalConversation."""
     conversation = Conversation(agent=agent, workspace="")
diff --git a/tests/sdk/observability/test_laminar.py b/tests/sdk/observability/test_laminar.py
index 9b3d5385b2..a452411c8e 100644
--- a/tests/sdk/observability/test_laminar.py
+++ b/tests/sdk/observability/test_laminar.py
@@ -438,6 +438,30 @@ def fake_use_span(span, *args, **kwargs):
         os.environ.pop("LMNR_PROJECT_API_KEY", None)
 
 
+def test_root_span_sets_attributes():
+    """RootSpan must attach provided attributes to the underlying span."""
+    os.environ["LMNR_PROJECT_API_KEY"] = "test-key"
+    try:
+        from lmnr import Laminar
+
+        from openhands.sdk.observability import laminar as lam
+
+        mock_span = MagicMock(name="span")
+
+        with patch.object(Laminar, "start_span", return_value=mock_span):
+            lam._observability_enabled = True
+            root = lam.RootSpan(
+                "conversation",
+                attributes={"conversation.tags.automationid": "auto-1"},
+            )
+            assert root.span is mock_span
+            mock_span.set_attribute.assert_called_once_with(
+                "conversation.tags.automationid", "auto-1"
+            )
+    finally:
+        os.environ.pop("LMNR_PROJECT_API_KEY", None)
+
+
 def test_two_concurrent_conversations_do_not_collide():
     """Each conversation must own its own root span (no global stack).