diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/advanced_settings.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/advanced_settings.tsx
deleted file mode 100644
index 4474973b3ce62..0000000000000
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/advanced_settings.tsx
+++ /dev/null
@@ -1,193 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import React, { useCallback, useMemo, useState } from 'react';
-import {
-  EuiFormRow,
-  EuiTitle,
-  EuiText,
-  EuiTextColor,
-  EuiHorizontalRule,
-  EuiLoadingSpinner,
-  EuiSpacer,
-  EuiSwitch,
-  EuiToolTip,
-  EuiSwitchEvent,
-  EuiLink,
-} from '@elastic/eui';
-
-import { FormattedMessage } from '@kbn/i18n-react';
-import * as i18n from './translations';
-import { useKnowledgeBaseStatus } from '../../../knowledge_base/use_knowledge_base_status/use_knowledge_base_status';
-import { useAssistantContext } from '../../../assistant_context';
-import { useSetupKnowledgeBase } from '../../../knowledge_base/use_setup_knowledge_base/use_setup_knowledge_base';
-import { useDeleteKnowledgeBase } from '../../../knowledge_base/use_delete_knowledge_base/use_delete_knowledge_base';
-
-const ESQL_RESOURCE = 'esql';
-interface Props {
-  onAdvancedSettingsChange?: () => void;
-}
-
-/**
- * Advanced Settings -- enable and disable LangChain integration, Knowledge Base, and ESQL KB Documents
- */
-export const AdvancedSettings: React.FC<Props> = React.memo(({ onAdvancedSettingsChange }) => {
-  const { http, assistantLangChain } = useAssistantContext();
-  const {
-    data: kbStatus,
-    isLoading,
-    isFetching,
-  } = useKnowledgeBaseStatus({ http, resource: ESQL_RESOURCE });
-  const { mutate: setupKB, isLoading: isSettingUpKB } = useSetupKnowledgeBase({ http });
-  const { mutate: deleteKB, isLoading: isDeletingUpKB } = useDeleteKnowledgeBase({ http });
-
-  const [isLangChainEnabled, setIsLangChainEnabled] = useState(assistantLangChain);
-  const isKnowledgeBaseEnabled =
-    (kbStatus?.index_exists && kbStatus?.pipeline_exists && kbStatus?.elser_exists) ?? false;
-  const isESQLEnabled = kbStatus?.esql_exists ?? false;
-
-  const isLoadingKb = isLoading || isFetching || isSettingUpKB || isDeletingUpKB;
-  const isKnowledgeBaseAvailable = isLangChainEnabled && kbStatus?.elser_exists;
-  const isESQLAvailable = isLangChainEnabled && isKnowledgeBaseAvailable && isKnowledgeBaseEnabled;
-
-  const onEnableKnowledgeBaseChange = useCallback(
-    (event: EuiSwitchEvent) => {
-      if (event.target.checked) {
-        setupKB();
-      } else {
-        deleteKB();
-      }
-    },
-    [deleteKB, setupKB]
-  );
-
-  const onEnableESQLChange = useCallback(
-    (event: EuiSwitchEvent) => {
-      if (event.target.checked) {
-        setupKB(ESQL_RESOURCE);
-      } else {
-        deleteKB(ESQL_RESOURCE);
-      }
-    },
-    [deleteKB, setupKB]
-  );
-
-  const langchainSwitch = useMemo(() => {
-    return (
-      <EuiSwitch
-        checked={isLangChainEnabled}
-        compressed
-        disabled={true} // Advanced settings only shown if assistantLangChain=true, remove when storing to localstorage as ui feature toggle
-        label={i18n.LANNGCHAIN_LABEL}
-        onChange={() => setIsLangChainEnabled(!isLangChainEnabled)}
-        showLabel={false}
-      />
-    );
-  }, [isLangChainEnabled]);
-
-  const knowledgeBaseSwitch = useMemo(() => {
-    return isLoadingKb ? (
-      <EuiLoadingSpinner size="s" />
-    ) : (
-      <EuiToolTip
-        position={'right'}
-        content={!isKnowledgeBaseAvailable ? i18n.KNOWLEDGE_BASE_LABEL_TOOLTIP : undefined}
-      >
-        <EuiSwitch
-          showLabel={false}
-          label={i18n.KNOWLEDGE_BASE_LABEL}
-          checked={isKnowledgeBaseEnabled}
-          disabled={!isKnowledgeBaseAvailable}
-          onChange={onEnableKnowledgeBaseChange}
-          compressed
-        />
-      </EuiToolTip>
-    );
-  }, [isLoadingKb, isKnowledgeBaseAvailable, isKnowledgeBaseEnabled, onEnableKnowledgeBaseChange]);
-
-  const esqlSwitch = useMemo(() => {
-    return isLoadingKb ? (
-      <EuiLoadingSpinner size="s" />
-    ) : (
-      <EuiToolTip
-        position={'right'}
-        content={!isESQLAvailable ? i18n.ESQL_LABEL_TOOLTIP : undefined}
-      >
-        <EuiSwitch
-          showLabel={false}
-          label={i18n.ESQL_LABEL}
-          checked={isESQLEnabled}
-          disabled={!isESQLAvailable}
-          onChange={onEnableESQLChange}
-          compressed
-        />
-      </EuiToolTip>
-    );
-  }, [isLoadingKb, isESQLAvailable, isESQLEnabled, onEnableESQLChange]);
-
-  return (
-    <>
-      <EuiTitle size={'s'}>
-        <h2>{i18n.SETTINGS_TITLE}</h2>
-      </EuiTitle>
-      <EuiSpacer size="xs" />
-
-      <EuiText size={'s'}>{i18n.SETTINGS_DESCRIPTION}</EuiText>
-
-      <EuiHorizontalRule margin={'s'} />
-
-      <EuiFormRow display="columnCompressedSwitch" label={i18n.LANNGCHAIN_LABEL}>
-        {langchainSwitch}
-      </EuiFormRow>
-      <EuiSpacer size="xs" />
-      <EuiTextColor color={'subdued'}>{i18n.LANNGCHAIN_DESCRIPTION}</EuiTextColor>
-      <EuiSpacer size="m" />
-
-      <EuiFormRow
-        display="columnCompressedSwitch"
-        label={i18n.KNOWLEDGE_BASE_LABEL}
-        isDisabled={!isKnowledgeBaseAvailable}
-      >
-        {knowledgeBaseSwitch}
-      </EuiFormRow>
-      <EuiSpacer size="xs" />
-      <EuiTextColor color={'subdued'}>
-        <FormattedMessage
-          defaultMessage="Initializes a local knowledge base for saving and retrieving relevant context for your conversations. Note: ELSER must be configured and started. {seeDocs}"
-          id="xpack.elasticAssistant.assistant.settings.advancedSettings.knowledgeBaseDescription"
-          values={{
-            seeDocs: (
-              <EuiLink
-                external
-                href={
-                  'https://www.elastic.co/guide/en/machine-learning/current/ml-nlp-elser.html#download-deploy-elser'
-                }
-                target="_blank"
-              >
-                {i18n.KNOWLEDGE_BASE_DESCRIPTION_ELSER_LEARN_MORE}
-              </EuiLink>
-            ),
-          }}
-        />
-      </EuiTextColor>
-      <EuiSpacer size="m" />
-
-      <EuiFormRow
-        isDisabled={!isESQLAvailable}
-        display="columnCompressedSwitch"
-        label={i18n.ESQL_LABEL}
-      >
-        {esqlSwitch}
-      </EuiFormRow>
-      <EuiSpacer size="xs" />
-      <EuiTextColor color={'subdued'}>{i18n.ESQL_DESCRIPTION}</EuiTextColor>
-      <EuiSpacer size="m" />
-    </>
-  );
-});
-
-AdvancedSettings.displayName = 'AdvancedSettings';
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/translations.ts b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/translations.ts
deleted file mode 100644
index ca849f0a6f7c5..0000000000000
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/advanced_settings/translations.ts
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { i18n } from '@kbn/i18n';
-
-export const SETTINGS_TITLE = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.settingsTitle',
-  {
-    defaultMessage: 'Advanced Settings',
-  }
-);
-export const SETTINGS_DESCRIPTION = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.settingsDescription',
-  {
-    defaultMessage: 'Additional knobs and dials for the Elastic AI Assistant.',
-  }
-);
-
-export const LANNGCHAIN_LABEL = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.langChainLabel',
-  {
-    defaultMessage: 'Experimental LangChain Integration',
-  }
-);
-
-export const LANNGCHAIN_DESCRIPTION = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.langChainDescription',
-  {
-    defaultMessage:
-      'Enables advanced features and workflows like the Knowledge Base, Functions, Memories, and advanced agent and chain configurations. ',
-  }
-);
-
-export const KNOWLEDGE_BASE_LABEL = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.knowledgeBaseLabel',
-  {
-    defaultMessage: 'Knowledge Base',
-  }
-);
-
-export const KNOWLEDGE_BASE_LABEL_TOOLTIP = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.knowledgeBaseLabelTooltip',
-  {
-    defaultMessage: 'Requires ELSER to be configured and started.',
-  }
-);
-
-export const KNOWLEDGE_BASE_DESCRIPTION_ELSER_LEARN_MORE = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.knowledgeBaseElserLearnMoreDescription',
-  {
-    defaultMessage: 'Learn more.',
-  }
-);
-
-export const ESQL_LABEL = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.esqlLabel',
-  {
-    defaultMessage: 'ES|QL Knowledge Base Documents',
-  }
-);
-
-export const ESQL_LABEL_TOOLTIP = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.esqlTooltip',
-  {
-    defaultMessage: 'Requires `Knowledge Base` to be enabled.',
-  }
-);
-
-export const ESQL_DESCRIPTION = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.advancedSettings.esqlDescription',
-  {
-    defaultMessage:
-      'Loads ES|QL documentation and language files into the Knowledge Base for use in generating ES|QL queries.',
-  }
-);
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/assistant_settings.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/assistant_settings.tsx
index caf8fa77a9b61..5b357fb6594cc 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/assistant_settings.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/assistant_settings.tsx
@@ -30,7 +30,7 @@ import { useAssistantContext } from '../../assistant_context';
 import { AnonymizationSettings } from '../../data_anonymization/settings/anonymization_settings';
 import { QuickPromptSettings } from '../quick_prompts/quick_prompt_settings/quick_prompt_settings';
 import { SystemPromptSettings } from '../prompt_editor/system_prompt/system_prompt_modal/system_prompt_settings';
-import { AdvancedSettings } from './advanced_settings/advanced_settings';
+import { KnowledgeBaseSettings } from '../../knowledge_base/knowledge_base_settings/knowledge_base_settings';
 import { ConversationSettings } from '../conversations/conversation_settings/conversation_settings';
 import { TEST_IDS } from '../constants';
 import { useSettingsUpdater } from './use_settings_updater/use_settings_updater';
@@ -45,7 +45,7 @@ export const CONVERSATIONS_TAB = 'CONVERSATION_TAB' as const;
 export const QUICK_PROMPTS_TAB = 'QUICK_PROMPTS_TAB' as const;
 export const SYSTEM_PROMPTS_TAB = 'SYSTEM_PROMPTS_TAB' as const;
 export const ANONYMIZATION_TAB = 'ANONYMIZATION_TAB' as const;
-export const ADVANCED_TAB = 'ADVANCED_TAB' as const;
+export const KNOWLEDGE_BASE_TAB = 'KNOWLEDGE_BASE_TAB' as const;
 export const EVALUATION_TAB = 'EVALUATION_TAB' as const;
 
 export type SettingsTabs =
@@ -53,7 +53,7 @@ export type SettingsTabs =
   | typeof QUICK_PROMPTS_TAB
   | typeof SYSTEM_PROMPTS_TAB
   | typeof ANONYMIZATION_TAB
-  | typeof ADVANCED_TAB
+  | typeof KNOWLEDGE_BASE_TAB
   | typeof EVALUATION_TAB;
 interface Props {
   defaultConnectorId?: string;
@@ -68,7 +68,7 @@ interface Props {
 
 /**
  * Modal for overall Assistant Settings, including conversation settings, quick prompts, system prompts,
- * anonymization, functions (coming soon!), and advanced settings.
+ * anonymization, knowledge base, and evaluation via the `isModelEvaluationEnabled` feature flag.
  */
 export const AssistantSettings: React.FC<Props> = React.memo(
   ({
@@ -79,17 +79,19 @@ export const AssistantSettings: React.FC<Props> = React.memo(
     selectedConversation: defaultSelectedConversation,
     setSelectedConversationId,
   }) => {
-    const { assistantLangChain, http, selectedSettingsTab, setSelectedSettingsTab } =
+    const { modelEvaluatorEnabled, http, selectedSettingsTab, setSelectedSettingsTab } =
       useAssistantContext();
     const {
       conversationSettings,
       defaultAllow,
       defaultAllowReplacement,
+      knowledgeBase,
       quickPromptSettings,
       systemPromptSettings,
       setUpdatedConversationSettings,
       setUpdatedDefaultAllow,
       setUpdatedDefaultAllowReplacement,
+      setUpdatedKnowledgeBaseSettings,
       setUpdatedQuickPromptSettings,
       setUpdatedSystemPromptSettings,
       saveSettings,
@@ -236,17 +238,15 @@ export const AssistantSettings: React.FC<Props> = React.memo(
               >
                 <EuiIcon type="eyeClosed" size="l" />
               </EuiKeyPadMenuItem>
-              {assistantLangChain && (
-                <EuiKeyPadMenuItem
-                  id={ADVANCED_TAB}
-                  label={i18n.ADVANCED_MENU_ITEM}
-                  isSelected={selectedSettingsTab === ADVANCED_TAB}
-                  onClick={() => setSelectedSettingsTab(ADVANCED_TAB)}
-                >
-                  <EuiIcon type="advancedSettingsApp" size="l" />
-                </EuiKeyPadMenuItem>
-              )}
-              {assistantLangChain && (
+              <EuiKeyPadMenuItem
+                id={KNOWLEDGE_BASE_TAB}
+                label={i18n.KNOWLEDGE_BASE_MENU_ITEM}
+                isSelected={selectedSettingsTab === KNOWLEDGE_BASE_TAB}
+                onClick={() => setSelectedSettingsTab(KNOWLEDGE_BASE_TAB)}
+              >
+                <EuiIcon type="notebookApp" size="l" />
+              </EuiKeyPadMenuItem>
+              {modelEvaluatorEnabled && (
                 <EuiKeyPadMenuItem
                   id={EVALUATION_TAB}
                   label={i18n.EVALUATION_MENU_ITEM}
@@ -307,7 +307,12 @@ export const AssistantSettings: React.FC<Props> = React.memo(
                     setUpdatedDefaultAllowReplacement={setUpdatedDefaultAllowReplacement}
                   />
                 )}
-                {selectedSettingsTab === ADVANCED_TAB && <AdvancedSettings />}
+                {selectedSettingsTab === KNOWLEDGE_BASE_TAB && (
+                  <KnowledgeBaseSettings
+                    knowledgeBase={knowledgeBase}
+                    setUpdatedKnowledgeBaseSettings={setUpdatedKnowledgeBaseSettings}
+                  />
+                )}
                 {selectedSettingsTab === EVALUATION_TAB && <EvaluationSettings />}
               </EuiSplitPanel.Inner>
               <EuiSplitPanel.Inner
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/translations.ts b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/translations.ts
index 6db8155c0d10c..7842d900265a6 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/translations.ts
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/translations.ts
@@ -49,10 +49,10 @@ export const ANONYMIZATION_MENU_ITEM = i18n.translate(
   }
 );
 
-export const ADVANCED_MENU_ITEM = i18n.translate(
-  'xpack.elasticAssistant.assistant.settings.settingsAdvancedMenuItemTitle',
+export const KNOWLEDGE_BASE_MENU_ITEM = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.settingsKnowledgeBaseMenuItemTitle',
   {
-    defaultMessage: 'Advanced',
+    defaultMessage: 'Knowledge Base',
   }
 );
 
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/use_settings_updater/use_settings_updater.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/use_settings_updater/use_settings_updater.tsx
index e40ae00b69720..0dfd6ebe2904c 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/use_settings_updater/use_settings_updater.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant/settings/use_settings_updater/use_settings_updater.tsx
@@ -8,11 +8,13 @@
 import React, { useCallback, useState } from 'react';
 import { Prompt, QuickPrompt } from '../../../..';
 import { UseAssistantContext, useAssistantContext } from '../../../assistant_context';
+import type { KnowledgeBaseConfig } from '../../types';
 
 interface UseSettingsUpdater {
   conversationSettings: UseAssistantContext['conversations'];
   defaultAllow: string[];
   defaultAllowReplacement: string[];
+  knowledgeBase: KnowledgeBaseConfig;
   quickPromptSettings: QuickPrompt[];
   resetSettings: () => void;
   systemPromptSettings: Prompt[];
@@ -21,6 +23,7 @@ interface UseSettingsUpdater {
   setUpdatedConversationSettings: React.Dispatch<
     React.SetStateAction<UseAssistantContext['conversations']>
   >;
+  setUpdatedKnowledgeBaseSettings: React.Dispatch<React.SetStateAction<KnowledgeBaseConfig>>;
   setUpdatedQuickPromptSettings: React.Dispatch<React.SetStateAction<QuickPrompt[]>>;
   setUpdatedSystemPromptSettings: React.Dispatch<React.SetStateAction<Prompt[]>>;
   saveSettings: () => void;
@@ -34,11 +37,13 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
     conversations,
     defaultAllow,
     defaultAllowReplacement,
+    knowledgeBase,
     setAllQuickPrompts,
     setAllSystemPrompts,
     setConversations,
     setDefaultAllow,
     setDefaultAllowReplacement,
+    setKnowledgeBase,
   } = useAssistantContext();
 
   /**
@@ -57,6 +62,9 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
   const [updatedDefaultAllow, setUpdatedDefaultAllow] = useState<string[]>(defaultAllow);
   const [updatedDefaultAllowReplacement, setUpdatedDefaultAllowReplacement] =
     useState<string[]>(defaultAllowReplacement);
+  // Knowledge Base
+  const [updatedKnowledgeBaseSettings, setUpdatedKnowledgeBaseSettings] =
+    useState<KnowledgeBaseConfig>(knowledgeBase);
 
   /**
    * Reset all pending settings
@@ -64,10 +72,18 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
   const resetSettings = useCallback((): void => {
     setUpdatedConversationSettings(conversations);
     setUpdatedQuickPromptSettings(allQuickPrompts);
+    setUpdatedKnowledgeBaseSettings(knowledgeBase);
     setUpdatedSystemPromptSettings(allSystemPrompts);
     setUpdatedDefaultAllow(defaultAllow);
     setUpdatedDefaultAllowReplacement(defaultAllowReplacement);
-  }, [allQuickPrompts, allSystemPrompts, conversations, defaultAllow, defaultAllowReplacement]);
+  }, [
+    allQuickPrompts,
+    allSystemPrompts,
+    conversations,
+    defaultAllow,
+    defaultAllowReplacement,
+    knowledgeBase,
+  ]);
 
   /**
    * Save all pending settings
@@ -76,6 +92,7 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
     setAllQuickPrompts(updatedQuickPromptSettings);
     setAllSystemPrompts(updatedSystemPromptSettings);
     setConversations(updatedConversationSettings);
+    setKnowledgeBase(updatedKnowledgeBaseSettings);
     setDefaultAllow(updatedDefaultAllow);
     setDefaultAllowReplacement(updatedDefaultAllowReplacement);
   }, [
@@ -84,9 +101,11 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
     setConversations,
     setDefaultAllow,
     setDefaultAllowReplacement,
+    setKnowledgeBase,
     updatedConversationSettings,
     updatedDefaultAllow,
     updatedDefaultAllowReplacement,
+    updatedKnowledgeBaseSettings,
     updatedQuickPromptSettings,
     updatedSystemPromptSettings,
   ]);
@@ -95,6 +114,7 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
     conversationSettings: updatedConversationSettings,
     defaultAllow: updatedDefaultAllow,
     defaultAllowReplacement: updatedDefaultAllowReplacement,
+    knowledgeBase: updatedKnowledgeBaseSettings,
     quickPromptSettings: updatedQuickPromptSettings,
     resetSettings,
     systemPromptSettings: updatedSystemPromptSettings,
@@ -102,6 +122,7 @@ export const useSettingsUpdater = (): UseSettingsUpdater => {
     setUpdatedDefaultAllow,
     setUpdatedDefaultAllowReplacement,
     setUpdatedConversationSettings,
+    setUpdatedKnowledgeBaseSettings,
     setUpdatedQuickPromptSettings,
     setUpdatedSystemPromptSettings,
   };
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/types.ts b/x-pack/packages/kbn-elastic-assistant/impl/assistant/types.ts
index dd5d184abfd20..e9ffd8f8014e8 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/types.ts
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant/types.ts
@@ -15,3 +15,7 @@ export interface Prompt {
   isDefault?: boolean; // TODO: Should be renamed to isImmutable as this flag is used to prevent users from deleting prompts
   isNewConversationDefault?: boolean;
 }
+
+export interface KnowledgeBaseConfig {
+  assistantLangChain: boolean;
+}
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant/use_send_messages/index.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant/use_send_messages/index.tsx
index 38dc60c5fc9e7..f9f63aa8ef8ac 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant/use_send_messages/index.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant/use_send_messages/index.tsx
@@ -29,7 +29,7 @@ interface UseSendMessages {
 }
 
 export const useSendMessages = (): UseSendMessages => {
-  const { assistantLangChain } = useAssistantContext();
+  const { knowledgeBase } = useAssistantContext();
   const [isLoading, setIsLoading] = useState(false);
 
   const sendMessages = useCallback(
@@ -37,7 +37,7 @@ export const useSendMessages = (): UseSendMessages => {
       setIsLoading(true);
       try {
         return await fetchConnectorExecuteAction({
-          assistantLangChain,
+          assistantLangChain: knowledgeBase.assistantLangChain,
           http,
           messages,
           apiConfig,
@@ -46,7 +46,7 @@ export const useSendMessages = (): UseSendMessages => {
         setIsLoading(false);
       }
     },
-    [assistantLangChain]
+    [knowledgeBase.assistantLangChain]
   );
 
   return { isLoading, sendMessages };
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/constants.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/constants.tsx
index cad3783c4669b..fbf1f68e05e0d 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/constants.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/constants.tsx
@@ -5,7 +5,14 @@
  * 2.0.
  */
 
+import { KnowledgeBaseConfig } from '../assistant/types';
+
 export const DEFAULT_ASSISTANT_NAMESPACE = 'elasticAssistantDefault';
 export const QUICK_PROMPT_LOCAL_STORAGE_KEY = 'quickPrompts';
 export const SYSTEM_PROMPT_LOCAL_STORAGE_KEY = 'systemPrompts';
 export const LAST_CONVERSATION_ID_LOCAL_STORAGE_KEY = 'lastConversationId';
+export const KNOWLEDGE_BASE_LOCAL_STORAGE_KEY = 'knowledgeBase';
+
+export const DEFAULT_KNOWLEDGE_BASE_SETTINGS: KnowledgeBaseConfig = {
+  assistantLangChain: false,
+};
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.test.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.test.tsx
index 89d3e4c6e8878..7e50643ae7595 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.test.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.test.tsx
@@ -28,7 +28,6 @@ const ContextWrapper: React.FC = ({ children }) => (
   <AssistantProvider
     actionTypeRegistry={actionTypeRegistry}
     assistantAvailability={mockAssistantAvailability}
-    assistantLangChain={false}
     augmentMessageCodeBlocks={jest.fn()}
     baseAllow={[]}
     baseAllowReplacement={[]}
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.tsx b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.tsx
index 229ec915ef9bb..f296246736a78 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/assistant_context/index.tsx
@@ -24,10 +24,12 @@ import { DEFAULT_ASSISTANT_TITLE } from '../assistant/translations';
 import { CodeBlockDetails } from '../assistant/use_conversation/helpers';
 import { PromptContextTemplate } from '../assistant/prompt_context/types';
 import { QuickPrompt } from '../assistant/quick_prompts/types';
-import { Prompt } from '../assistant/types';
+import type { KnowledgeBaseConfig, Prompt } from '../assistant/types';
 import { BASE_SYSTEM_PROMPTS } from '../content/prompts/system';
 import {
   DEFAULT_ASSISTANT_NAMESPACE,
+  DEFAULT_KNOWLEDGE_BASE_SETTINGS,
+  KNOWLEDGE_BASE_LOCAL_STORAGE_KEY,
   LAST_CONVERSATION_ID_LOCAL_STORAGE_KEY,
   QUICK_PROMPT_LOCAL_STORAGE_KEY,
   SYSTEM_PROMPT_LOCAL_STORAGE_KEY,
@@ -49,7 +51,6 @@ type ShowAssistantOverlay = ({
 export interface AssistantProviderProps {
   actionTypeRegistry: ActionTypeRegistryContract;
   assistantAvailability: AssistantAvailability;
-  assistantLangChain: boolean;
   assistantTelemetry?: AssistantTelemetry;
   augmentMessageCodeBlocks: (currentConversation: Conversation) => CodeBlockDetails[][];
   baseAllow: string[];
@@ -73,6 +74,7 @@ export interface AssistantProviderProps {
   }) => EuiCommentProps[];
   http: HttpSetup;
   getInitialConversations: () => Record<string, Conversation>;
+  modelEvaluatorEnabled?: boolean;
   nameSpace?: string;
   setConversations: React.Dispatch<React.SetStateAction<Record<string, Conversation>>>;
   setDefaultAllow: React.Dispatch<React.SetStateAction<string[]>>;
@@ -87,7 +89,6 @@ export interface UseAssistantContext {
   augmentMessageCodeBlocks: (currentConversation: Conversation) => CodeBlockDetails[][];
   allQuickPrompts: QuickPrompt[];
   allSystemPrompts: Prompt[];
-  assistantLangChain: boolean;
   baseAllow: string[];
   baseAllowReplacement: string[];
   docLinks: Omit<DocLinksStart, 'links'>;
@@ -110,8 +111,10 @@ export interface UseAssistantContext {
     showAnonymizedValues: boolean;
   }) => EuiCommentProps[];
   http: HttpSetup;
+  knowledgeBase: KnowledgeBaseConfig;
   localStorageLastConversationId: string | undefined;
   promptContexts: Record<string, PromptContext>;
+  modelEvaluatorEnabled: boolean;
   nameSpace: string;
   registerPromptContext: RegisterPromptContext;
   selectedSettingsTab: SettingsTabs;
@@ -120,6 +123,7 @@ export interface UseAssistantContext {
   setConversations: React.Dispatch<React.SetStateAction<Record<string, Conversation>>>;
   setDefaultAllow: React.Dispatch<React.SetStateAction<string[]>>;
   setDefaultAllowReplacement: React.Dispatch<React.SetStateAction<string[]>>;
+  setKnowledgeBase: React.Dispatch<React.SetStateAction<KnowledgeBaseConfig | undefined>>;
   setLastConversationId: React.Dispatch<React.SetStateAction<string | undefined>>;
   setSelectedSettingsTab: React.Dispatch<React.SetStateAction<SettingsTabs>>;
   setShowAssistantOverlay: (showAssistantOverlay: ShowAssistantOverlay) => void;
@@ -133,7 +137,6 @@ const AssistantContext = React.createContext<UseAssistantContext | undefined>(un
 export const AssistantProvider: React.FC<AssistantProviderProps> = ({
   actionTypeRegistry,
   assistantAvailability,
-  assistantLangChain,
   assistantTelemetry,
   augmentMessageCodeBlocks,
   baseAllow,
@@ -149,6 +152,7 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
   getComments,
   http,
   getInitialConversations,
+  modelEvaluatorEnabled = false,
   nameSpace = DEFAULT_ASSISTANT_NAMESPACE,
   setConversations,
   setDefaultAllow,
@@ -174,6 +178,14 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
   const [localStorageLastConversationId, setLocalStorageLastConversationId] =
     useLocalStorage<string>(`${nameSpace}.${LAST_CONVERSATION_ID_LOCAL_STORAGE_KEY}`);
 
+  /**
+   * Local storage for knowledge base configuration, prefixed by assistant nameSpace
+   */
+  const [localStorageKnowledgeBase, setLocalStorageKnowledgeBase] = useLocalStorage(
+    `${nameSpace}.${KNOWLEDGE_BASE_LOCAL_STORAGE_KEY}`,
+    DEFAULT_KNOWLEDGE_BASE_SETTINGS
+  );
+
   /**
    * Prompt contexts are used to provide components a way to register and make their data available to the assistant.
    */
@@ -254,7 +266,6 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
     () => ({
       actionTypeRegistry,
       assistantAvailability,
-      assistantLangChain,
       assistantTelemetry,
       augmentMessageCodeBlocks,
       allQuickPrompts: localStorageQuickPrompts ?? [],
@@ -272,6 +283,8 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
       docLinks,
       getComments,
       http,
+      knowledgeBase: localStorageKnowledgeBase ?? DEFAULT_KNOWLEDGE_BASE_SETTINGS,
+      modelEvaluatorEnabled,
       promptContexts,
       nameSpace,
       registerPromptContext,
@@ -281,6 +294,7 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
       setConversations: onConversationsUpdated,
       setDefaultAllow,
       setDefaultAllowReplacement,
+      setKnowledgeBase: setLocalStorageKnowledgeBase,
       setSelectedSettingsTab,
       setShowAssistantOverlay,
       showAssistantOverlay,
@@ -292,7 +306,6 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
     [
       actionTypeRegistry,
       assistantAvailability,
-      assistantLangChain,
       assistantTelemetry,
       augmentMessageCodeBlocks,
       baseAllow,
@@ -308,9 +321,11 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
       docLinks,
       getComments,
       http,
+      localStorageKnowledgeBase,
       localStorageLastConversationId,
       localStorageQuickPrompts,
       localStorageSystemPrompts,
+      modelEvaluatorEnabled,
       nameSpace,
       onConversationsUpdated,
       promptContexts,
@@ -318,6 +333,7 @@ export const AssistantProvider: React.FC<AssistantProviderProps> = ({
       selectedSettingsTab,
       setDefaultAllow,
       setDefaultAllowReplacement,
+      setLocalStorageKnowledgeBase,
       setLocalStorageLastConversationId,
       setLocalStorageQuickPrompts,
       setLocalStorageSystemPrompts,
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/knowledge_base_settings.tsx b/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/knowledge_base_settings.tsx
new file mode 100644
index 0000000000000..2c667a5739ef6
--- /dev/null
+++ b/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/knowledge_base_settings.tsx
@@ -0,0 +1,294 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, { useCallback, useMemo } from 'react';
+import {
+  EuiFormRow,
+  EuiTitle,
+  EuiText,
+  EuiHorizontalRule,
+  EuiLoadingSpinner,
+  EuiSpacer,
+  EuiSwitchEvent,
+  EuiLink,
+  EuiBetaBadge,
+  EuiFlexGroup,
+  EuiFlexItem,
+  EuiHealth,
+  EuiButtonEmpty,
+  EuiSwitch,
+} from '@elastic/eui';
+
+import { FormattedMessage } from '@kbn/i18n-react';
+import { css } from '@emotion/react';
+import * as i18n from './translations';
+import { useAssistantContext } from '../../assistant_context';
+import { useDeleteKnowledgeBase } from '../use_delete_knowledge_base/use_delete_knowledge_base';
+import { useKnowledgeBaseStatus } from '../use_knowledge_base_status/use_knowledge_base_status';
+import { useSetupKnowledgeBase } from '../use_setup_knowledge_base/use_setup_knowledge_base';
+
+import type { KnowledgeBaseConfig } from '../../assistant/types';
+
+const ESQL_RESOURCE = 'esql';
+const KNOWLEDGE_BASE_INDEX_PATTERN = '.kibana-elastic-ai-assistant-kb';
+
+interface Props {
+  knowledgeBase: KnowledgeBaseConfig;
+  setUpdatedKnowledgeBaseSettings: React.Dispatch<React.SetStateAction<KnowledgeBaseConfig>>;
+}
+
+/**
+ * Knowledge Base Settings -- enable and disable LangChain integration, Knowledge Base, and ESQL KB Documents
+ */
+export const KnowledgeBaseSettings: React.FC<Props> = React.memo(
+  ({ knowledgeBase, setUpdatedKnowledgeBaseSettings }) => {
+    const { http } = useAssistantContext();
+    const {
+      data: kbStatus,
+      isLoading,
+      isFetching,
+    } = useKnowledgeBaseStatus({ http, resource: ESQL_RESOURCE });
+    const { mutate: setupKB, isLoading: isSettingUpKB } = useSetupKnowledgeBase({ http });
+    const { mutate: deleteKB, isLoading: isDeletingUpKB } = useDeleteKnowledgeBase({ http });
+
+    // Resource enabled state
+    const isKnowledgeBaseEnabled =
+      (kbStatus?.index_exists && kbStatus?.pipeline_exists && kbStatus?.elser_exists) ?? false;
+    const isESQLEnabled = kbStatus?.esql_exists ?? false;
+
+    // Resource availability state
+    const isLoadingKb = isLoading || isFetching || isSettingUpKB || isDeletingUpKB;
+    const isKnowledgeBaseAvailable = knowledgeBase.assistantLangChain && kbStatus?.elser_exists;
+    const isESQLAvailable =
+      knowledgeBase.assistantLangChain && isKnowledgeBaseAvailable && isKnowledgeBaseEnabled;
+
+    // Calculated health state for EuiHealth component
+    const elserHealth = kbStatus?.elser_exists ? 'success' : 'subdued';
+    const knowledgeBaseHealth = isKnowledgeBaseEnabled ? 'success' : 'subdued';
+    const esqlHealth = isESQLEnabled ? 'success' : 'subdued';
+
+    //////////////////////////////////////////////////////////////////////////////////////////
+    // Main `Knowledge Base` switch, which toggles the `assistantLangChain` UI feature toggle
+    // setting that is saved to localstorage
+    const onEnableAssistantLangChainChange = useCallback(
+      (event: EuiSwitchEvent) => {
+        setUpdatedKnowledgeBaseSettings({
+          ...knowledgeBase,
+          assistantLangChain: event.target.checked,
+        });
+
+        // If enabling and ELSER exists, try to set up automatically
+        if (event.target.checked && kbStatus?.elser_exists) {
+          setupKB(ESQL_RESOURCE);
+        }
+      },
+      [kbStatus?.elser_exists, knowledgeBase, setUpdatedKnowledgeBaseSettings, setupKB]
+    );
+
+    const assistantLangChainSwitch = useMemo(() => {
+      return isLoadingKb ? (
+        <EuiLoadingSpinner size="s" />
+      ) : (
+        <EuiSwitch
+          showLabel={false}
+          checked={knowledgeBase.assistantLangChain}
+          onChange={onEnableAssistantLangChainChange}
+          label={i18n.KNOWLEDGE_BASE_LABEL}
+          compressed
+        />
+      );
+    }, [isLoadingKb, knowledgeBase.assistantLangChain, onEnableAssistantLangChainChange]);
+
+    //////////////////////////////////////////////////////////////////////////////////////////
+    // Knowledge Base Resource
+    const onEnableKB = useCallback(
+      (enabled: boolean) => {
+        if (enabled) {
+          setupKB();
+        } else {
+          deleteKB();
+        }
+      },
+      [deleteKB, setupKB]
+    );
+
+    const knowledgeBaseActionButton = useMemo(() => {
+      return isLoadingKb || !isKnowledgeBaseAvailable ? (
+        <></>
+      ) : (
+        <EuiButtonEmpty
+          color={isKnowledgeBaseEnabled ? 'danger' : 'primary'}
+          flush="left"
+          onClick={() => onEnableKB(!isKnowledgeBaseEnabled)}
+          size="xs"
+        >
+          {isKnowledgeBaseEnabled
+            ? i18n.KNOWLEDGE_BASE_DELETE_BUTTON
+            : i18n.KNOWLEDGE_BASE_INIT_BUTTON}
+        </EuiButtonEmpty>
+      );
+    }, [isKnowledgeBaseAvailable, isKnowledgeBaseEnabled, isLoadingKb, onEnableKB]);
+
+    const knowledgeBaseDescription = useMemo(() => {
+      return isKnowledgeBaseEnabled ? (
+        <>
+          {i18n.KNOWLEDGE_BASE_DESCRIPTION_INSTALLED(KNOWLEDGE_BASE_INDEX_PATTERN)}{' '}
+          {knowledgeBaseActionButton}
+        </>
+      ) : (
+        <>
+          {i18n.KNOWLEDGE_BASE_DESCRIPTION} {knowledgeBaseActionButton}
+        </>
+      );
+    }, [isKnowledgeBaseEnabled, knowledgeBaseActionButton]);
+
+    //////////////////////////////////////////////////////////////////////////////////////////
+    // ESQL Resource
+    const onEnableESQL = useCallback(
+      (enabled: boolean) => {
+        if (enabled) {
+          setupKB(ESQL_RESOURCE);
+        } else {
+          deleteKB(ESQL_RESOURCE);
+        }
+      },
+      [deleteKB, setupKB]
+    );
+
+    const esqlActionButton = useMemo(() => {
+      return isLoadingKb || !isESQLAvailable ? (
+        <></>
+      ) : (
+        <EuiButtonEmpty
+          color={isESQLEnabled ? 'danger' : 'primary'}
+          flush="left"
+          onClick={() => onEnableESQL(!isESQLEnabled)}
+          size="xs"
+        >
+          {isESQLEnabled ? i18n.KNOWLEDGE_BASE_DELETE_BUTTON : i18n.KNOWLEDGE_BASE_INIT_BUTTON}
+        </EuiButtonEmpty>
+      );
+    }, [isLoadingKb, isESQLAvailable, isESQLEnabled, onEnableESQL]);
+
+    const esqlDescription = useMemo(() => {
+      return isESQLEnabled ? (
+        <>
+          {i18n.ESQL_DESCRIPTION_INSTALLED} {esqlActionButton}
+        </>
+      ) : (
+        <>
+          {i18n.ESQL_DESCRIPTION} {esqlActionButton}
+        </>
+      );
+    }, [esqlActionButton, isESQLEnabled]);
+
+    return (
+      <>
+        <EuiTitle size={'s'}>
+          <h2>
+            {i18n.SETTINGS_TITLE}{' '}
+            <EuiBetaBadge iconType={'beaker'} label={i18n.SETTINGS_BADGE} size="s" color="hollow" />
+          </h2>
+        </EuiTitle>
+        <EuiSpacer size="xs" />
+        <EuiText size={'s'}>{i18n.SETTINGS_DESCRIPTION}</EuiText>
+        <EuiHorizontalRule margin={'s'} />
+
+        <EuiFormRow
+          display="columnCompressedSwitch"
+          label={i18n.KNOWLEDGE_BASE_LABEL}
+          css={css`
+            div {
+              min-width: 95px !important;
+            }
+          `}
+        >
+          {assistantLangChainSwitch}
+        </EuiFormRow>
+        <EuiSpacer size="s" />
+
+        <EuiFlexGroup
+          direction={'column'}
+          gutterSize={'s'}
+          css={css`
+            padding-left: 5px;
+          `}
+        >
+          <EuiFlexItem>
+            <div>
+              <EuiHealth color={elserHealth}>{i18n.KNOWLEDGE_BASE_ELSER_LABEL}</EuiHealth>
+              <EuiText
+                size={'xs'}
+                color={'subdued'}
+                css={css`
+                  padding-left: 20px;
+                `}
+              >
+                <FormattedMessage
+                  defaultMessage="Configure ELSER within {machineLearning} to get started. {seeDocs}"
+                  id="xpack.elasticAssistant.assistant.settings.knowledgeBasedSettings.knowledgeBaseDescription"
+                  values={{
+                    machineLearning: (
+                      <EuiLink
+                        external
+                        href={http.basePath.prepend('/app/ml/trained_models')}
+                        target="_blank"
+                      >
+                        {i18n.KNOWLEDGE_BASE_ELSER_MACHINE_LEARNING}
+                      </EuiLink>
+                    ),
+                    seeDocs: (
+                      <EuiLink
+                        external
+                        href={
+                          'https://www.elastic.co/guide/en/machine-learning/current/ml-nlp-elser.html#download-deploy-elser'
+                        }
+                        target="_blank"
+                      >
+                        {i18n.KNOWLEDGE_BASE_ELSER_SEE_DOCS}
+                      </EuiLink>
+                    ),
+                  }}
+                />
+              </EuiText>
+            </div>
+          </EuiFlexItem>
+          <EuiFlexItem>
+            <div>
+              <EuiHealth color={knowledgeBaseHealth}>{i18n.KNOWLEDGE_BASE_LABEL}</EuiHealth>
+              <EuiText
+                size={'xs'}
+                color={'subdued'}
+                css={css`
+                  padding-left: 20px;
+                `}
+              >
+                {knowledgeBaseDescription}
+              </EuiText>
+            </div>
+          </EuiFlexItem>
+          <EuiFlexItem grow={false}>
+            <span>
+              <EuiHealth color={esqlHealth}>{i18n.ESQL_LABEL}</EuiHealth>
+              <EuiText
+                size={'xs'}
+                color={'subdued'}
+                css={css`
+                  padding-left: 20px;
+                `}
+              >
+                {esqlDescription}
+              </EuiText>
+            </span>
+          </EuiFlexItem>
+        </EuiFlexGroup>
+      </>
+    );
+  }
+);
+
+KnowledgeBaseSettings.displayName = 'KnowledgeBaseSettings';
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/translations.ts b/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/translations.ts
new file mode 100644
index 0000000000000..95417ddf6a889
--- /dev/null
+++ b/x-pack/packages/kbn-elastic-assistant/impl/knowledge_base/knowledge_base_settings/translations.ts
@@ -0,0 +1,109 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { i18n } from '@kbn/i18n';
+
+export const SETTINGS_TITLE = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.settingsTitle',
+  {
+    defaultMessage: 'Knowledge Base',
+  }
+);
+
+export const SETTINGS_BADGE = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.settingsBadgeTitle',
+  {
+    defaultMessage: 'Experimental',
+  }
+);
+
+export const SETTINGS_DESCRIPTION = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.settingsDescription',
+  {
+    defaultMessage:
+      'Powered by ELSER, the Knowledge Base enables the ability to recall documents and other relevant context within your conversation.',
+  }
+);
+
+export const KNOWLEDGE_BASE_LABEL = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.knowledgeBaseLabel',
+  {
+    defaultMessage: 'Knowledge Base',
+  }
+);
+
+export const KNOWLEDGE_BASE_DESCRIPTION = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.knowledgeBaseDescription',
+  {
+    defaultMessage: 'Index where Knowledge Base docs are stored',
+  }
+);
+
+export const KNOWLEDGE_BASE_DESCRIPTION_INSTALLED = (kbIndexPattern: string) =>
+  i18n.translate(
+    'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.knowledgeBaseInstalledDescription',
+    {
+      defaultMessage: 'Initialized to `{kbIndexPattern}`',
+      values: { kbIndexPattern },
+    }
+  );
+
+export const KNOWLEDGE_BASE_INIT_BUTTON = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.initializeKnowledgeBaseButton',
+  {
+    defaultMessage: 'Initialize',
+  }
+);
+
+export const KNOWLEDGE_BASE_DELETE_BUTTON = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.deleteKnowledgeBaseButton',
+  {
+    defaultMessage: 'Delete',
+  }
+);
+
+export const KNOWLEDGE_BASE_ELSER_LABEL = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.elserLabel',
+  {
+    defaultMessage: 'ELSER Configured',
+  }
+);
+
+export const KNOWLEDGE_BASE_ELSER_MACHINE_LEARNING = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.elserMachineLearningDescription',
+  {
+    defaultMessage: 'Machine Learning',
+  }
+);
+
+export const KNOWLEDGE_BASE_ELSER_SEE_DOCS = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.elserSeeDocsDescription',
+  {
+    defaultMessage: 'See docs',
+  }
+);
+
+export const ESQL_LABEL = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.esqlLabel',
+  {
+    defaultMessage: 'ES|QL Knowledge Base Documents',
+  }
+);
+
+export const ESQL_DESCRIPTION = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.esqlDescription',
+  {
+    defaultMessage: 'Knowledge Base docs for generating ES|QL queries',
+  }
+);
+
+export const ESQL_DESCRIPTION_INSTALLED = i18n.translate(
+  'xpack.elasticAssistant.assistant.settings.knowledgeBaseSettings.esqlInstalledDescription',
+  {
+    defaultMessage: 'ES|QL Knowledge Base docs loaded',
+  }
+);
diff --git a/x-pack/packages/kbn-elastic-assistant/impl/mock/test_providers/test_providers.tsx b/x-pack/packages/kbn-elastic-assistant/impl/mock/test_providers/test_providers.tsx
index 53a73ec16b661..024e39ac46c3c 100644
--- a/x-pack/packages/kbn-elastic-assistant/impl/mock/test_providers/test_providers.tsx
+++ b/x-pack/packages/kbn-elastic-assistant/impl/mock/test_providers/test_providers.tsx
@@ -72,7 +72,6 @@ export const TestProvidersComponent: React.FC<Props> = ({
           <AssistantProvider
             actionTypeRegistry={actionTypeRegistry}
             assistantAvailability={assistantAvailability}
-            assistantLangChain={false}
             augmentMessageCodeBlocks={jest.fn().mockReturnValue([])}
             baseAllow={[]}
             baseAllowReplacement={[]}
diff --git a/x-pack/packages/security-solution/ecs_data_quality_dashboard/impl/data_quality/mock/test_providers/test_providers.tsx b/x-pack/packages/security-solution/ecs_data_quality_dashboard/impl/data_quality/mock/test_providers/test_providers.tsx
index 56e33b008b29a..b2bd63f8101aa 100644
--- a/x-pack/packages/security-solution/ecs_data_quality_dashboard/impl/data_quality/mock/test_providers/test_providers.tsx
+++ b/x-pack/packages/security-solution/ecs_data_quality_dashboard/impl/data_quality/mock/test_providers/test_providers.tsx
@@ -46,7 +46,6 @@ export const TestProvidersComponent: React.FC<Props> = ({ children, isILMAvailab
         <AssistantProvider
           actionTypeRegistry={actionTypeRegistry}
           assistantAvailability={mockAssistantAvailability}
-          assistantLangChain={false}
           augmentMessageCodeBlocks={jest.fn()}
           baseAllow={[]}
           baseAllowReplacement={[]}
diff --git a/x-pack/plugins/security_solution/public/assistant/provider.tsx b/x-pack/plugins/security_solution/public/assistant/provider.tsx
index 794ed7e9e3f70..6d38b45914466 100644
--- a/x-pack/plugins/security_solution/public/assistant/provider.tsx
+++ b/x-pack/plugins/security_solution/public/assistant/provider.tsx
@@ -55,9 +55,6 @@ export const AssistantProvider: React.FC = ({ children }) => {
       actionTypeRegistry={actionTypeRegistry}
       augmentMessageCodeBlocks={augmentMessageCodeBlocks}
       assistantAvailability={assistantAvailability}
-      // NOTE: `assistantLangChain` and `assistantModelEvaluation` experimental feature will be coupled until upcoming
-      // Knowledge Base UI updates, which will remove the `assistantLangChain` feature flag in favor of a UI feature toggle
-      assistantLangChain={isModelEvaluationEnabled}
       assistantTelemetry={assistantTelemetry}
       defaultAllow={defaultAllow}
       defaultAllowReplacement={defaultAllowReplacement}
@@ -71,6 +68,7 @@ export const AssistantProvider: React.FC = ({ children }) => {
       getInitialConversations={getInitialConversation}
       getComments={getComments}
       http={http}
+      modelEvaluatorEnabled={isModelEvaluationEnabled}
       nameSpace={nameSpace}
       setConversations={setConversations}
       setDefaultAllow={setDefaultAllow}
diff --git a/x-pack/plugins/security_solution/public/common/mock/mock_assistant_provider.tsx b/x-pack/plugins/security_solution/public/common/mock/mock_assistant_provider.tsx
index 2954f47e0d1a8..4dc5f01b0ee7d 100644
--- a/x-pack/plugins/security_solution/public/common/mock/mock_assistant_provider.tsx
+++ b/x-pack/plugins/security_solution/public/common/mock/mock_assistant_provider.tsx
@@ -34,7 +34,6 @@ export const MockAssistantProviderComponent: React.FC<Props> = ({ children }) =>
     <AssistantProvider
       actionTypeRegistry={actionTypeRegistry}
       assistantAvailability={mockAssistantAvailability}
-      assistantLangChain={false}
       augmentMessageCodeBlocks={jest.fn(() => [])}
       baseAllow={[]}
       baseAllowReplacement={[]}