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diff --git a/packages/cli/src/ui/hooks/useReactToolScheduler.ts b/packages/cli/src/ui/hooks/useReactToolScheduler.ts
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+++ b/packages/cli/src/ui/hooks/useReactToolScheduler.ts
@@ -0,0 +1,301 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {
+  Config,
+  ToolCallRequestInfo,
+  ExecutingToolCall,
+  ScheduledToolCall,
+  ValidatingToolCall,
+  WaitingToolCall,
+  CompletedToolCall,
+  CancelledToolCall,
+  CoreToolScheduler,
+  OutputUpdateHandler,
+  AllToolCallsCompleteHandler,
+  ToolCallsUpdateHandler,
+  Tool,
+  ToolCall,
+  Status as CoreStatus,
+} from '@gemini-code/core';
+import { useCallback, useEffect, useState, useRef } from 'react';
+import {
+  HistoryItemToolGroup,
+  IndividualToolCallDisplay,
+  ToolCallStatus,
+  HistoryItemWithoutId,
+} from '../types.js';
+
+export type ScheduleFn = (
+  request: ToolCallRequestInfo | ToolCallRequestInfo[],
+) => void;
+export type CancelFn = (reason?: string) => void;
+export type MarkToolsAsSubmittedFn = (callIds: string[]) => void;
+
+export type TrackedScheduledToolCall = ScheduledToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+export type TrackedValidatingToolCall = ValidatingToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+export type TrackedWaitingToolCall = WaitingToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+export type TrackedExecutingToolCall = ExecutingToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+export type TrackedCompletedToolCall = CompletedToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+export type TrackedCancelledToolCall = CancelledToolCall & {
+  responseSubmittedToGemini?: boolean;
+};
+
+export type TrackedToolCall =
+  | TrackedScheduledToolCall
+  | TrackedValidatingToolCall
+  | TrackedWaitingToolCall
+  | TrackedExecutingToolCall
+  | TrackedCompletedToolCall
+  | TrackedCancelledToolCall;
+
+export function useReactToolScheduler(
+  onComplete: (tools: CompletedToolCall[]) => void,
+  config: Config,
+  setPendingHistoryItem: React.Dispatch<
+    React.SetStateAction<HistoryItemWithoutId | null>
+  >,
+): [TrackedToolCall[], ScheduleFn, CancelFn, MarkToolsAsSubmittedFn] {
+  const [toolCallsForDisplay, setToolCallsForDisplay] = useState<
+    TrackedToolCall[]
+  >([]);
+  const schedulerRef = useRef<CoreToolScheduler | null>(null);
+
+  useEffect(() => {
+    const outputUpdateHandler: OutputUpdateHandler = (
+      toolCallId,
+      outputChunk,
+    ) => {
+      setPendingHistoryItem((prevItem) => {
+        if (prevItem?.type === 'tool_group') {
+          return {
+            ...prevItem,
+            tools: prevItem.tools.map((toolDisplay) =>
+              toolDisplay.callId === toolCallId &&
+              toolDisplay.status === ToolCallStatus.Executing
+                ? { ...toolDisplay, resultDisplay: outputChunk }
+                : toolDisplay,
+            ),
+          };
+        }
+        return prevItem;
+      });
+
+      setToolCallsForDisplay((prevCalls) =>
+        prevCalls.map((tc) => {
+          if (tc.request.callId === toolCallId && tc.status === 'executing') {
+            const executingTc = tc as TrackedExecutingToolCall;
+            return { ...executingTc, liveOutput: outputChunk };
+          }
+          return tc;
+        }),
+      );
+    };
+
+    const allToolCallsCompleteHandler: AllToolCallsCompleteHandler = (
+      completedToolCalls,
+    ) => {
+      onComplete(completedToolCalls);
+    };
+
+    const toolCallsUpdateHandler: ToolCallsUpdateHandler = (
+      updatedCoreToolCalls: ToolCall[],
+    ) => {
+      setToolCallsForDisplay((prevTrackedCalls) =>
+        updatedCoreToolCalls.map((coreTc) => {
+          const existingTrackedCall = prevTrackedCalls.find(
+            (ptc) => ptc.request.callId === coreTc.request.callId,
+          );
+          const newTrackedCall: TrackedToolCall = {
+            ...coreTc,
+            responseSubmittedToGemini:
+              existingTrackedCall?.responseSubmittedToGemini ?? false,
+          } as TrackedToolCall;
+          return newTrackedCall;
+        }),
+      );
+    };
+
+    schedulerRef.current = new CoreToolScheduler({
+      toolRegistry: config.getToolRegistry(),
+      outputUpdateHandler,
+      onAllToolCallsComplete: allToolCallsCompleteHandler,
+      onToolCallsUpdate: toolCallsUpdateHandler,
+    });
+  }, [config, onComplete, setPendingHistoryItem]);
+
+  const schedule: ScheduleFn = useCallback(
+    async (request: ToolCallRequestInfo | ToolCallRequestInfo[]) => {
+      schedulerRef.current?.schedule(request);
+    },
+    [],
+  );
+
+  const cancel: CancelFn = useCallback((reason: string = 'unspecified') => {
+    schedulerRef.current?.cancelAll(reason);
+  }, []);
+
+  const markToolsAsSubmitted: MarkToolsAsSubmittedFn = useCallback(
+    (callIdsToMark: string[]) => {
+      setToolCallsForDisplay((prevCalls) =>
+        prevCalls.map((tc) =>
+          callIdsToMark.includes(tc.request.callId)
+            ? { ...tc, responseSubmittedToGemini: true }
+            : tc,
+        ),
+      );
+    },
+    [],
+  );
+
+  return [toolCallsForDisplay, schedule, cancel, markToolsAsSubmitted];
+}
+
+/**
+ * Maps a CoreToolScheduler status to the UI's ToolCallStatus enum.
+ */
+function mapCoreStatusToDisplayStatus(coreStatus: CoreStatus): ToolCallStatus {
+  switch (coreStatus) {
+    case 'validating':
+      return ToolCallStatus.Executing;
+    case 'awaiting_approval':
+      return ToolCallStatus.Confirming;
+    case 'executing':
+      return ToolCallStatus.Executing;
+    case 'success':
+      return ToolCallStatus.Success;
+    case 'cancelled':
+      return ToolCallStatus.Canceled;
+    case 'error':
+      return ToolCallStatus.Error;
+    case 'scheduled':
+      return ToolCallStatus.Pending;
+    default: {
+      const exhaustiveCheck: never = coreStatus;
+      console.warn(`Unknown core status encountered: ${exhaustiveCheck}`);
+      return ToolCallStatus.Error;
+    }
+  }
+}
+
+/**
+ * Transforms `TrackedToolCall` objects into `HistoryItemToolGroup` objects for UI display.
+ */
+export function mapToDisplay(
+  toolOrTools: TrackedToolCall[] | TrackedToolCall,
+): HistoryItemToolGroup {
+  const toolCalls = Array.isArray(toolOrTools) ? toolOrTools : [toolOrTools];
+
+  const toolDisplays = toolCalls.map(
+    (trackedCall): IndividualToolCallDisplay => {
+      let displayName = trackedCall.request.name;
+      let description = '';
+      let renderOutputAsMarkdown = false;
+
+      const currentToolInstance =
+        'tool' in trackedCall && trackedCall.tool
+          ? (trackedCall as { tool: Tool }).tool
+          : undefined;
+
+      if (currentToolInstance) {
+        displayName = currentToolInstance.displayName;
+        description = currentToolInstance.getDescription(
+          trackedCall.request.args,
+        );
+        renderOutputAsMarkdown = currentToolInstance.isOutputMarkdown;
+      }
+
+      if (trackedCall.status === 'error') {
+        description = '';
+      }
+
+      const baseDisplayProperties: Omit<
+        IndividualToolCallDisplay,
+        'status' | 'resultDisplay' | 'confirmationDetails'
+      > = {
+        callId: trackedCall.request.callId,
+        name: displayName,
+        description,
+        renderOutputAsMarkdown,
+      };
+
+      switch (trackedCall.status) {
+        case 'success':
+          return {
+            ...baseDisplayProperties,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay: trackedCall.response.resultDisplay,
+            confirmationDetails: undefined,
+          };
+        case 'error':
+          return {
+            ...baseDisplayProperties,
+            name: currentToolInstance?.displayName ?? trackedCall.request.name,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay: trackedCall.response.resultDisplay,
+            confirmationDetails: undefined,
+          };
+        case 'cancelled':
+          return {
+            ...baseDisplayProperties,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay: trackedCall.response.resultDisplay,
+            confirmationDetails: undefined,
+          };
+        case 'awaiting_approval':
+          return {
+            ...baseDisplayProperties,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay: undefined,
+            confirmationDetails: trackedCall.confirmationDetails,
+          };
+        case 'executing':
+          return {
+            ...baseDisplayProperties,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay:
+              (trackedCall as TrackedExecutingToolCall).liveOutput ?? undefined,
+            confirmationDetails: undefined,
+          };
+        case 'validating': // Fallthrough
+        case 'scheduled':
+          return {
+            ...baseDisplayProperties,
+            status: mapCoreStatusToDisplayStatus(trackedCall.status),
+            resultDisplay: undefined,
+            confirmationDetails: undefined,
+          };
+        default: {
+          const exhaustiveCheck: never = trackedCall;
+          return {
+            callId: (exhaustiveCheck as TrackedToolCall).request.callId,
+            name: 'Unknown Tool',
+            description: 'Encountered an unknown tool call state.',
+            status: ToolCallStatus.Error,
+            resultDisplay: 'Unknown tool call state',
+            confirmationDetails: undefined,
+            renderOutputAsMarkdown: false,
+          };
+        }
+      }
+    },
+  );
+
+  return {
+    type: 'tool_group',
+    tools: toolDisplays,
+  };
+}