diff --git a/packages/cli/src/ui/hooks/useSessionResume.ts b/packages/cli/src/ui/hooks/useSessionResume.ts
index 055686773bd..d43cba8fecb 100644
--- a/packages/cli/src/ui/hooks/useSessionResume.ts
+++ b/packages/cli/src/ui/hooks/useSessionResume.ts
@@ -10,6 +10,7 @@ import {
   type Config,
   type ResumedSessionData,
   convertSessionToClientHistory,
+  uiTelemetryService,
 } from '@google/gemini-cli-core';
 import type { Part } from '@google/genai';
 import type { HistoryItemWithoutId } from '../types.js';
@@ -109,6 +110,8 @@ export function useSessionResume({
       !hasLoadedResumedSession.current
     ) {
       hasLoadedResumedSession.current = true;
+      // Hydrate telemetry service with the resumed conversation to restore session ID and metrics
+      uiTelemetryService.hydrate(resumedSessionData.conversation);
       const historyData = convertSessionToHistoryFormats(
         resumedSessionData.conversation.messages,
       );
diff --git a/packages/core/src/config/config.test.ts b/packages/core/src/config/config.test.ts
index a43921e1444..f000aea18d3 100644
--- a/packages/core/src/config/config.test.ts
+++ b/packages/core/src/config/config.test.ts
@@ -71,6 +71,7 @@ import {
 } from './models.js';
 import { Storage } from './storage.js';
 import type { AgentLoopContext } from './agent-loop-context.js';
+import type { ShellExecutionConfig } from '../services/shellExecutionService.js';
 
 vi.mock('fs', async (importOriginal) => {
   const actual = await importOriginal<typeof import('fs')>();
@@ -304,6 +305,42 @@ describe('Server Config (config.ts)', () => {
     });
   });
 
+  describe('shell execution config', () => {
+    it('should preserve existing sandbox and background fields when updated', () => {
+      const config = new Config({
+        ...baseParams,
+        shellBackgroundCompletionBehavior: 'notify',
+      });
+
+      const shellExecutionConfig = config.getShellExecutionConfig();
+
+      config.setShellExecutionConfig({
+        terminalWidth: 123,
+        terminalHeight: 45,
+        pager: 'less',
+        showColor: true,
+        sanitizationConfig: shellExecutionConfig.sanitizationConfig,
+        sandboxManager: shellExecutionConfig.sandboxManager,
+      } as ShellExecutionConfig);
+
+      const updatedShellExecutionConfig = config.getShellExecutionConfig();
+
+      expect(updatedShellExecutionConfig.terminalWidth).toBe(123);
+      expect(updatedShellExecutionConfig.terminalHeight).toBe(45);
+      expect(updatedShellExecutionConfig.pager).toBe('less');
+      expect(updatedShellExecutionConfig.showColor).toBe(true);
+      expect(updatedShellExecutionConfig.sandboxConfig).toMatchObject({
+        enabled: true,
+        command: 'docker',
+        image: 'gemini-cli-sandbox',
+        networkAccess: false,
+      });
+      expect(updatedShellExecutionConfig.backgroundCompletionBehavior).toBe(
+        'notify',
+      );
+    });
+  });
+
   beforeEach(() => {
     // Reset mocks if necessary
     vi.clearAllMocks();
diff --git a/packages/core/src/config/config.ts b/packages/core/src/config/config.ts
index 2ef6fc26a8f..9e0ccf85d16 100644
--- a/packages/core/src/config/config.ts
+++ b/packages/core/src/config/config.ts
@@ -3334,17 +3334,38 @@ export class Config implements McpContext, AgentLoopContext {
 
   setShellExecutionConfig(config: ShellExecutionConfig): void {
     this.shellExecutionConfig = {
+      ...this.shellExecutionConfig,
       terminalWidth:
         config.terminalWidth ?? this.shellExecutionConfig.terminalWidth,
       terminalHeight:
         config.terminalHeight ?? this.shellExecutionConfig.terminalHeight,
       showColor: config.showColor ?? this.shellExecutionConfig.showColor,
       pager: config.pager ?? this.shellExecutionConfig.pager,
+      defaultFg: config.defaultFg ?? this.shellExecutionConfig.defaultFg,
+      defaultBg: config.defaultBg ?? this.shellExecutionConfig.defaultBg,
       sanitizationConfig:
         config.sanitizationConfig ??
         this.shellExecutionConfig.sanitizationConfig,
       sandboxManager:
         config.sandboxManager ?? this.shellExecutionConfig.sandboxManager,
+      sandboxConfig:
+        config.sandboxConfig ?? this.shellExecutionConfig.sandboxConfig,
+      backgroundCompletionBehavior:
+        config.backgroundCompletionBehavior ??
+        this.shellExecutionConfig.backgroundCompletionBehavior,
+      additionalPermissions:
+        config.additionalPermissions ??
+        this.shellExecutionConfig.additionalPermissions,
+      disableDynamicLineTrimming:
+        config.disableDynamicLineTrimming ??
+        this.shellExecutionConfig.disableDynamicLineTrimming,
+      scrollback: config.scrollback ?? this.shellExecutionConfig.scrollback,
+      maxSerializedLines:
+        config.maxSerializedLines ??
+        this.shellExecutionConfig.maxSerializedLines,
+      originalCommand:
+        config.originalCommand ?? this.shellExecutionConfig.originalCommand,
+      sessionId: config.sessionId ?? this.shellExecutionConfig.sessionId,
     };
   }
   getScreenReader(): boolean {