diff --git a/Packs/Slack/Integrations/SlackV3/SlackV3.py b/Packs/Slack/Integrations/SlackV3/SlackV3.py
index 3873ab2c7d28..1bd4a6f36865 100644
--- a/Packs/Slack/Integrations/SlackV3/SlackV3.py
+++ b/Packs/Slack/Integrations/SlackV3/SlackV3.py
@@ -3491,7 +3491,11 @@ def resolve_conversation_id_from_name(channel_name):
         channel_id = conversation_info.get("id")
 
     if not channel_id:
-        raise DemistoException(f"Channel '{channel_name}' does not exist.")
+        raise CortexResourceNotFoundError(
+            resource_type="Slack channel",
+            identifier=channel_name,
+            override_message=f"Channel '{channel_name}' does not exist.",
+        )
 
     return channel_id
 
@@ -3513,7 +3517,11 @@ def conversation_history() -> None:
     thread_id = args.get("thread_id")
 
     if not conversation_id and not conversation_name:
-        raise ValueError("Either conversation_id or conversation_name must be provided.")
+        raise CortexMissingArgError(
+            ["conversation_id", "conversation_name"],
+            require_one=True,
+            override_message="Either conversation_id or conversation_name must be provided.",
+        )
 
     if not conversation_id:
         conversation_id = resolve_conversation_id_from_name(conversation_name)
@@ -3530,11 +3538,11 @@ def conversation_history() -> None:
     if page_token:
         body["cursor"] = page_token
 
-    raw_response = send_slack_request_sync(CLIENT, "conversations.history", http_verb="GET", body=body)
-
-    if not raw_response.get("ok"):
-        raise DemistoException(
-            f'An error occurred while listing conversation history: {raw_response.get("error")}', res=raw_response
+    try:
+        raw_response = send_slack_request_sync(CLIENT, "conversations.history", http_verb="GET", body=body)
+    except SlackApiError as e:
+        raise CortexExternalApiError(
+            override_message=f"An error occurred while listing conversation history: {e.response.get('error')}"
         )
 
     messages: Any = raw_response.get("messages", [])
@@ -3545,8 +3553,8 @@ def conversation_history() -> None:
     if isinstance(messages, dict):
         messages = [messages]
     if not isinstance(messages, list):
-        raise DemistoException(
-            f'An error occurred while listing conversation history: {raw_response.get("error")}', res=raw_response
+        raise CortexExternalApiError(
+            override_message=f"An error occurred while listing conversation history: {raw_response.get('error')}"
         )
 
     context: List[Dict[str, Any]] = []
diff --git a/Packs/Slack/Integrations/SlackV3/SlackV3_test.py b/Packs/Slack/Integrations/SlackV3/SlackV3_test.py
index 9ca4c006e965..ddaca74f1342 100644
--- a/Packs/Slack/Integrations/SlackV3/SlackV3_test.py
+++ b/Packs/Slack/Integrations/SlackV3/SlackV3_test.py
@@ -6,6 +6,7 @@
 from pytest_mock.plugin import MockerFixture
 import slack_sdk
 from CommonServerPython import *
+from CommonServerPython import CortexMissingArgError, CortexResourceNotFoundError
 from slack_sdk.errors import SlackApiError
 from slack_sdk.web.async_slack_response import AsyncSlackResponse
 from slack_sdk.web.slack_response import SlackResponse
@@ -5459,14 +5460,14 @@ def test_conversation_history_no_channel_provided_error(mocker):
 
     Given: A conversation_history command is configured and no channel parameters are provided
     When: The conversation_history command is called with args missing both conversation_id and conversation_name
-    Then: The command raises ValueError with appropriate error message
+    Then: The command raises CortexMissingArgError with appropriate error message
     """
 
     args = {"limit": "10"}
 
     mocker.patch.object(demisto, "args", return_value=args)
 
-    with pytest.raises(ValueError, match="Either conversation_id or conversation_name must be provided."):
+    with pytest.raises(CortexMissingArgError, match="Either conversation_id or conversation_name must be provided."):
         conversation_history()
 
 
@@ -5508,12 +5509,12 @@ def test_resolve_conversation_id_from_name_no_channel_found(mocker):
 
     Given: The resolve_conversation_id_from_name function is called with a channel name that doesn't exist.
     When: No private conversation or channel exists for the specified name and channel id is not provided.
-    Then: The function raises ValueError with appropriate error message indicating the channel was not found.
+    Then: The function raises CortexResourceNotFoundError with appropriate error message indicating the channel was not found.
     """
     mocker.patch("SlackV3.get_direct_message_channel_id_by_username", return_value=None)
     mocker.patch("SlackV3.get_conversation_by_name", return_value={})
 
-    with pytest.raises(DemistoException, match="Channel 'nonexistent' does not exist."):
+    with pytest.raises(CortexResourceNotFoundError, match="Channel 'nonexistent' does not exist."):
         resolve_conversation_id_from_name("nonexistent")
 
 
diff --git a/Packs/Slack/ReleaseNotes/3_8_18.md b/Packs/Slack/ReleaseNotes/3_8_18.md
new file mode 100644
index 000000000000..9d43d4f61756
--- /dev/null
+++ b/Packs/Slack/ReleaseNotes/3_8_18.md
@@ -0,0 +1,9 @@
+
+#### Integrations
+
+##### Slack v3
+
+- Documentation and metadata improvements.
+<!-- 
+- Improved implementation by migrating error messages across the ***slack-get-conversation-history*** command to the CortexError format to provide structured, machine-readable error metadata for Agentix callers.
+-->
diff --git a/Packs/Slack/pack_metadata.json b/Packs/Slack/pack_metadata.json
index 6985a91869cb..4f129eac03c6 100644
--- a/Packs/Slack/pack_metadata.json
+++ b/Packs/Slack/pack_metadata.json
@@ -2,7 +2,7 @@
     "name": "Slack",
     "description": "Interact with Slack API - collect logs, send messages and notifications to your Slack team.",
     "support": "xsoar",
-    "currentVersion": "3.8.17",
+    "currentVersion": "3.8.18",
     "author": "Cortex XSOAR",
     "url": "https://www.paloaltonetworks.com/cortex",
     "email": "",