diff --git a/synapseclient/api/agent_services.py b/synapseclient/api/agent_services.py
index 821541a93..7d7d43838 100644
--- a/synapseclient/api/agent_services.py
+++ b/synapseclient/api/agent_services.py
@@ -9,6 +9,7 @@
 if TYPE_CHECKING:
     from synapseclient import Synapse
 
+from synapseclient.core.constants.concrete_types import AGENT_CHAT_REQUEST
 from synapseclient.core.exceptions import SynapseTimeoutError
 
 
@@ -19,6 +20,8 @@ async def register_agent(
 ) -> Dict[str, Any]:
     """
     Registers an agent with Synapse OR gets existing agent registration.
+    Sends a request matching
+    <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/AgentRegistrationRequest.html>
 
     Arguments:
         cloud_agent_id: The cloud provider ID of the agent to register.
@@ -36,10 +39,9 @@ async def register_agent(
 
     client = Synapse.get_client(synapse_client=synapse_client)
 
-    # Request matching <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/AgentRegistrationRequest.html>
     request = {
         "awsAgentId": cloud_agent_id,
-        "awsAliasId": cloud_alias_id if cloud_alias_id else None,
+        "awsAliasId": cloud_alias_id if cloud_alias_id else "TSTALIASID",
     }
     return await client.rest_put_async(
         uri="/agent/registration", body=json.dumps(request)
@@ -75,6 +77,8 @@ async def start_session(
 ) -> Dict[str, Any]:
     """
     Starts a new chat session with an agent.
+    Sends a request matching
+    <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/CreateAgentSessionRequest.html>
 
     Arguments:
         access_level: The access level of the agent.
@@ -87,7 +91,6 @@ async def start_session(
 
     client = Synapse.get_client(synapse_client=synapse_client)
 
-    # Request matching <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/CreateAgentSessionRequest.html>
     request = {
         "agentAccessLevel": access_level,
         "agentRegistrationId": agent_registration_id,
@@ -125,6 +128,8 @@ async def update_session(
 ) -> Dict[str, Any]:
     """
     Updates the access level for a chat session.
+    Sends a request matching
+    <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/UpdateAgentSessionRequest.html>
 
     Arguments:
         id: The ID of the session to update.
@@ -137,7 +142,6 @@ async def update_session(
 
     client = Synapse.get_client(synapse_client=synapse_client)
 
-    # Request matching <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/UpdateAgentSessionRequest.html>
     request = {
         "sessionId": id,
         "agentAccessLevel": access_level,
@@ -155,6 +159,8 @@ async def send_prompt(
 ) -> Dict[str, Any]:
     """
     Sends a prompt to an agent starting an asyncronous job.
+    Sends a request matching
+    <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/AgentChatRequest.html>
 
     Arguments:
         id: The ID of the session to send the prompt to.
@@ -172,9 +178,8 @@ async def send_prompt(
 
     client = Synapse.get_client(synapse_client=synapse_client)
 
-    # Request matching <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/AgentChatRequest.html>
     request = {
-        "concreteType": "org.sagebionetworks.repo.model.agent.AgentChatRequest",
+        "concreteType": AGENT_CHAT_REQUEST,
         "sessionId": id,
         "chatText": prompt,
         "enableTrace": enable_trace,
@@ -209,6 +214,8 @@ async def get_response(
     from synapseclient import Synapse
 
     client = Synapse.get_client(synapse_client=synapse_client)
+    # TODO: Create async compliant version of _waitForAsync and add this logic there
+    # synapseclient/core/async_utils.py
     start_time = asyncio.get_event_loop().time()
     TIMEOUT = 60
 
@@ -233,10 +240,14 @@ async def get_trace(
 ) -> Dict[str, Any]:
     """
     Gets the trace of a prompt.
+    Sends a request matching
+    <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/TraceEventsRequest.html>
 
     Arguments:
         prompt_id: The token of the prompt to get the trace for.
         newer_than: The timestamp to get trace results newer than. Defaults to None (all results).
+                    Timestamps should be in milliseconds since the epoch per the API documentation.
+                    https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/TraceEvent.html
         synapse_client: If not passed in and caching was not disabled by
                 `Synapse.allow_client_caching(False)` this will use the last created
                 instance from the Synapse class constructor.
@@ -249,7 +260,6 @@ async def get_trace(
 
     client = Synapse.get_client(synapse_client=synapse_client)
 
-    # Request matching <https://rest-docs.synapse.org/rest/org/sagebionetworks/repo/model/agent/TraceEventsRequest.html>
     request = {
         "jobId": prompt_id,
         "newerThanTimestamp": newer_than,
diff --git a/synapseclient/core/constants/concrete_types.py b/synapseclient/core/constants/concrete_types.py
index f8d4ee442..e2033c030 100644
--- a/synapseclient/core/constants/concrete_types.py
+++ b/synapseclient/core/constants/concrete_types.py
@@ -68,3 +68,6 @@
 # Activity/Provenance
 USED_URL = "org.sagebionetworks.repo.model.provenance.UsedURL"
 USED_ENTITY = "org.sagebionetworks.repo.model.provenance.UsedEntity"
+
+# Agent
+AGENT_CHAT_REQUEST = "org.sagebionetworks.repo.model.agent.AgentChatRequest"