diff --git a/src/auth/commands/resources-command.ts b/src/auth/commands/resources-command.ts
index f3269457..cf6666c3 100644
--- a/src/auth/commands/resources-command.ts
+++ b/src/auth/commands/resources-command.ts
@@ -46,6 +46,13 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
 
   const currentPolicy = resolveSharedResourcePolicy(currentProfile);
 
+  if (mode === '') {
+    exitWithError(
+      'Missing value for --mode: expected shared|profile-local',
+      ExitCode.PROFILE_ERROR
+    );
+  }
+
   if (mode !== undefined && !isSharedResourceMode(mode)) {
     exitWithError(
       'Invalid shared resource mode: expected shared|profile-local',
@@ -53,7 +60,7 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
     );
   }
 
-  if (!mode) {
+  if (mode === undefined) {
     if (json) {
       console.log(
         JSON.stringify(
@@ -92,7 +99,8 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
     : undefined;
   const previousLegacy = existsLegacy ? ctx.registry.getProfile(profileName) : undefined;
   const contextPolicy = resolveAccountContextPolicy(currentProfile);
-  const metadata = sharedResourceModeToMetadata(mode);
+  const selectedMode: SharedResourceMode = mode;
+  const metadata = sharedResourceModeToMetadata(selectedMode);
 
   try {
     if (existsUnified) {
@@ -103,7 +111,7 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
     }
 
     await ctx.instanceMgr.ensureInstance(profileName, contextPolicy, {
-      bare: mode === 'profile-local',
+      bare: selectedMode === 'profile-local',
     });
   } catch (error) {
     if (existsUnified && previousUnified) {
@@ -128,9 +136,9 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
       JSON.stringify(
         {
           name: profileName,
-          shared_resource_mode: mode,
+          shared_resource_mode: selectedMode,
           shared_resource_inferred: false,
-          bare: mode === 'profile-local' ? true : undefined,
+          bare: selectedMode === 'profile-local' ? true : undefined,
         },
         null,
         2
@@ -139,8 +147,8 @@ export async function handleResources(ctx: CommandContext, args: string[]): Prom
     return;
   }
 
-  console.log(ok(`Shared resources for "${profileName}" set to ${formatMode(mode)}`));
+  console.log(ok(`Shared resources for "${profileName}" set to ${formatMode(selectedMode)}`));
   console.log('');
-  console.log(modeDescription(mode));
+  console.log(modeDescription(selectedMode));
   console.log('');
 }
diff --git a/tests/unit/auth-command-args.test.ts b/tests/unit/auth-command-args.test.ts
index 9badc1f2..f7404ab0 100644
--- a/tests/unit/auth-command-args.test.ts
+++ b/tests/unit/auth-command-args.test.ts
@@ -77,6 +77,13 @@ describe('auth command args parsing', () => {
     expect(parsed.mode).toBe('shared');
   });
 
+  it('flags missing shared resource mode value as empty string', () => {
+    const parsed = parseArgs(['work', '--mode'], { allowMode: true });
+
+    expect(parsed.profileName).toBe('work');
+    expect(parsed.mode).toBe('');
+  });
+
   it('treats shared resource mode as unknown unless the command opts in', () => {
     const parsed = parseArgs(['work', '--mode', 'shared']);
 
diff --git a/tests/unit/auth-resources-command.test.ts b/tests/unit/auth-resources-command.test.ts
index 88379cfe..2264ed3d 100644
--- a/tests/unit/auth-resources-command.test.ts
+++ b/tests/unit/auth-resources-command.test.ts
@@ -172,6 +172,43 @@ describe('auth resources command', () => {
     expect(account.bare).toBeUndefined();
   });
 
+  it('rejects resources --mode without a value instead of showing current mode', async () => {
+    const ccsDir = path.join(tempRoot, '.ccs');
+    fs.mkdirSync(ccsDir, { recursive: true });
+    fs.writeFileSync(
+      path.join(ccsDir, 'config.yaml'),
+      [
+        'version: 8',
+        'accounts:',
+        '  work:',
+        '    created: "2026-02-01T00:00:00.000Z"',
+        '    last_used: null',
+        'profiles: {}',
+        'cliproxy:',
+        '  oauth_accounts: {}',
+        '  providers: {}',
+        '  variants: {}',
+      ].join('\n'),
+      'utf8'
+    );
+
+    const registry = new ProfileRegistry();
+    const instanceMgr = new InstanceManager();
+
+    const output = await expectProfileExit(() =>
+      handleResources(
+        {
+          registry,
+          instanceMgr,
+          version: 'test',
+        },
+        ['work', '--mode']
+      )
+    );
+
+    expect(output).toContain('Missing value for --mode: expected shared|profile-local');
+  });
+
   it('rejects --mode on auth create instead of silently ignoring it', async () => {
     const registry = new ProfileRegistry();
     const instanceMgr = new InstanceManager();