Refine execution lifecycle facade follow-ups

packages/cli/src/ui/hooks/shellCommandProcessor.ts

@@ -80,7 +80,7 @@ export const useShellCommandProcessor = (
   setShellInputFocused: (value: boolean) => void,
   terminalWidth?: number,
   terminalHeight?: number,
-  activeToolPtyId?: number,
+  activeBackgroundExecutionId?: number,
   isWaitingForConfirmation?: boolean,
 ) => {
   const [state, dispatch] = useReducer(shellReducer, initialState);
@@ -103,7 +103,8 @@ export const useShellCommandProcessor = (
   }
   const m = manager.current;
 
-  const activePtyId = state.activeShellPtyId || activeToolPtyId;
+  const activePtyId =
+    state.activeShellPtyId ?? activeBackgroundExecutionId ?? undefined;
 
   useEffect(() => {
     const isForegroundActive = !!activePtyId || !!isWaitingForConfirmation;
@@ -191,7 +192,8 @@ export const useShellCommandProcessor = (
   ]);
 
   const backgroundCurrentShell = useCallback(() => {
-    const pidToBackground = state.activeShellPtyId || activeToolPtyId;
+    const pidToBackground =
+      state.activeShellPtyId ?? activeBackgroundExecutionId;
     if (pidToBackground) {
       ShellExecutionService.background(pidToBackground);
       m.backgroundedPids.add(pidToBackground);
@@ -202,7 +204,7 @@ export const useShellCommandProcessor = (
         m.restoreTimeout = null;
       }
     }
-  }, [state.activeShellPtyId, activeToolPtyId, m]);
+  }, [state.activeShellPtyId, activeBackgroundExecutionId, m]);
 
   const dismissBackgroundShell = useCallback(
     (pid: number) => {

packages/cli/src/ui/hooks/useGeminiStream.test.tsx

@@ -96,6 +96,31 @@ const MockedUserPromptEvent = vi.hoisted(() =>
   vi.fn().mockImplementation(() => {}),
 );
 const mockParseAndFormatApiError = vi.hoisted(() => vi.fn());
+const mockIsBackgroundExecutionData = vi.hoisted(
+  () => (data: unknown): data is { executionId?: number; pid?: number } => {
+    if (typeof data !== 'object' || data === null) {
+      return false;
+    }
+    const value = data as {
+      executionId?: unknown;
+      pid?: unknown;
+      command?: unknown;
+      initialOutput?: unknown;
+    };
+    return (
+      (value.executionId === undefined || typeof value.executionId === 'number') &&
+      (value.pid === undefined || typeof value.pid === 'number') &&
+      (value.command === undefined || typeof value.command === 'string') &&
+      (value.initialOutput === undefined ||
+        typeof value.initialOutput === 'string')
+    );
+  },
+);
+const mockGetBackgroundExecutionId = vi.hoisted(
+  () =>
+    (data: { executionId?: number; pid?: number }): number | undefined =>
+      data.executionId ?? data.pid,
+);
 
 const MockValidationRequiredError = vi.hoisted(
   () =>
@@ -121,6 +146,11 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
   const actualCoreModule = (await importOriginal()) as any;
   return {
     ...actualCoreModule,
+    isBackgroundExecutionData:
+      actualCoreModule.isBackgroundExecutionData ??
+      mockIsBackgroundExecutionData,
+    getBackgroundExecutionId:
+      actualCoreModule.getBackgroundExecutionId ?? mockGetBackgroundExecutionId,
     GitService: vi.fn(),
     GeminiClient: MockedGeminiClientClass,
     UserPromptEvent: MockedUserPromptEvent,

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -37,6 +37,8 @@ import {
   buildUserSteeringHintPrompt,
   GeminiCliOperation,
   getPlanModeExitMessage,
+  getBackgroundExecutionId,
+  isBackgroundExecutionData,
 } from '@google/gemini-cli-core';
 import type {
   Config,
@@ -100,12 +102,12 @@ interface BackgroundedToolInfo {
   initialOutput: string;
 }
 
-interface BackgroundExecutionData {
+type BackgroundExecutionDataLike = {
   executionId?: number;
   pid?: number;
   command?: string;
   initialOutput?: string;
-}
+} & Record<string, unknown>;
 
 enum StreamProcessingStatus {
   Completed,
@@ -118,55 +120,58 @@ const SUPPRESSED_TOOL_ERRORS_NOTE =
 const LOW_VERBOSITY_FAILURE_NOTE =
   'This request failed. Press F12 for diagnostics, or run /settings and change "Error Verbosity" to full for full details.';
 
-function isBackgroundExecutionData(
+function isBackgroundExecutionDataValidator(
-  data: unknown,
+  candidate: unknown,
-): data is BackgroundExecutionData {
+): candidate is (data: unknown) => data is BackgroundExecutionDataLike {
-  if (typeof data !== 'object' || data === null) {
+  return typeof candidate === 'function';
-    return false;
-  }
-
-  const executionId = 'executionId' in data ? data.executionId : undefined;
-  const pid = 'pid' in data ? data.pid : undefined;
-  const command = 'command' in data ? data.command : undefined;
-  const initialOutput =
-    'initialOutput' in data ? data.initialOutput : undefined;
-
-  return (
-    (executionId === undefined || typeof executionId === 'number') &&
-    (pid === undefined || typeof pid === 'number') &&
-    (command === undefined || typeof command === 'string') &&
-    (initialOutput === undefined || typeof initialOutput === 'string')
-  );
 }
 
-function getBackgroundExecutionId(
+function isBackgroundExecutionIdGetter(
-  data: BackgroundExecutionData,
+  candidate: unknown,
+): candidate is (data: BackgroundExecutionDataLike) => number | undefined {
+  return typeof candidate === 'function';
+}
+
+function isBackgroundExecutionDataFromCore(
+  data: unknown,
+): data is BackgroundExecutionDataLike {
+  const candidate: unknown = isBackgroundExecutionData;
+  if (isBackgroundExecutionDataValidator(candidate)) {
+    return candidate(data);
+  }
+
+  return false;
+}
+
+function getBackgroundExecutionIdFromCore(
+  data: BackgroundExecutionDataLike,
 ): number | undefined {
-  if (typeof data.executionId === 'number') {
+  const candidate: unknown = getBackgroundExecutionId;
-    return data.executionId;
+  if (isBackgroundExecutionIdGetter(candidate)) {
+    return candidate(data);
   }
-  if (typeof data.pid === 'number') {
+
-    return data.pid;
+  return data.executionId ?? data.pid;
-  }
-  return undefined;
 }
 
 function getBackgroundedToolInfo(
   toolCall: TrackedCompletedToolCall | TrackedCancelledToolCall,
 ): BackgroundedToolInfo | undefined {
   const response = toolCall.response as ToolResponseWithParts;
-  const rawData = response?.data;
+  const rawData: unknown = response?.data;
-  const data = isBackgroundExecutionData(rawData) ? rawData : undefined;
+  if (!isBackgroundExecutionDataFromCore(rawData)) {
-  const executionId = data ? getBackgroundExecutionId(data) : undefined;
+    return undefined;
+  }
 
+  const executionId = getBackgroundExecutionIdFromCore(rawData);
   if (executionId === undefined) {
     return undefined;
   }
 
   return {
     executionId,
-    command: data.command ?? toolCall.request.name,
+    command: rawData.command ?? toolCall.request.name,
-    initialOutput: data.initialOutput ?? '',
+    initialOutput: rawData.initialOutput ?? '',
   };
 }
 

packages/core/src/services/executionLifecycleService.test.ts

@@ -133,6 +133,21 @@ describe('ExecutionLifecycleService', () => {
     expect(result.error?.message).toContain('Operation cancelled by user');
   });
 
+  it('does not probe OS process state for completed non-process execution IDs', async () => {
+    const handle = ExecutionLifecycleService.createExecution();
+    if (handle.pid === undefined) {
+      throw new Error('Expected execution ID.');
+    }
+
+    ExecutionLifecycleService.completeExecution(handle.pid, { exitCode: 0 });
+    await handle.result;
+
+    const processKillSpy = vi.spyOn(process, 'kill');
+    expect(ExecutionLifecycleService.isActive(handle.pid)).toBe(false);
+    expect(processKillSpy).not.toHaveBeenCalled();
+    processKillSpy.mockRestore();
+  });
+
   it('manages external executions through registration hooks', async () => {
     const writeInput = vi.fn();
     const isActive = vi.fn().mockReturnValue(true);

packages/core/src/services/executionLifecycleService.ts

@@ -312,16 +312,6 @@ export class ExecutionLifecycleService {
     this.settleExecution(executionId, result);
   }
 
-  /**
-   * @deprecated Use completeWithResult() for new call sites.
-   */
-  static finalizeExecution(
-    executionId: number,
-    result: ExecutionResult,
-  ): void {
-    this.completeWithResult(executionId, result);
-  }
-
   static background(executionId: number): void {
     const resolve = this.activeResolvers.get(executionId);
     if (!resolve) {
@@ -423,6 +413,9 @@ export class ExecutionLifecycleService {
   static isActive(executionId: number): boolean {
     const execution = this.activeExecutions.get(executionId);
     if (!execution) {
+      if (executionId >= NON_PROCESS_EXECUTION_ID_START) {
+        return false;
+      }
       try {
         return process.kill(executionId, 0);
       } catch {