feat(cli): undeprecate the --prompt flag (#13981)

Co-authored-by: Allen Hutchison <adh@google.com>

packages/cli/src/config/config.ts

@@ -242,11 +242,7 @@ export async function parseArguments(settings: Settings): Promise<CliArgs> {
           type: 'string',
           description: 'Path to a file to record model responses for testing.',
           hidden: true,
-        })
-        .deprecateOption(
-          'prompt',
-          'Use the positional prompt instead. This flag will be removed in a future version.',
-        ),
+        }),
     )
     // Register MCP subcommands
     .command(mcpCommand)

packages/cli/src/gemini.tsx

@@ -689,9 +689,6 @@ export async function main() {
       debugLogger.log('Session ID: %s', sessionId);
     }
 
-    const hasDeprecatedPromptArg = process.argv.some((arg) =>
-      arg.startsWith('--prompt'),
-    );
     initializeOutputListenersAndFlush();
 
     await runNonInteractive({
@@ -699,7 +696,6 @@ export async function main() {
       settings,
       input,
       prompt_id,
-      hasDeprecatedPromptArg,
       resumedSessionData,
     });
     // Call cleanup before process.exit, which causes cleanup to not run

packages/cli/src/nonInteractiveCli.test.ts

@@ -1418,58 +1418,6 @@ describe('runNonInteractive', () => {
     });
   });
 
-  it('should display a deprecation warning if hasDeprecatedPromptArg is true', async () => {
-    const events: ServerGeminiStreamEvent[] = [
-      { type: GeminiEventType.Content, value: 'Final Answer' },
-      {
-        type: GeminiEventType.Finished,
-        value: { reason: undefined, usageMetadata: { totalTokenCount: 10 } },
-      },
-    ];
-    mockGeminiClient.sendMessageStream.mockReturnValue(
-      createStreamFromEvents(events),
-    );
-
-    await runNonInteractive({
-      config: mockConfig,
-      settings: mockSettings,
-      input: 'Test input',
-      prompt_id: 'prompt-id-deprecated',
-      hasDeprecatedPromptArg: true,
-    });
-
-    expect(processStderrSpy).toHaveBeenCalledWith(
-      'The --prompt (-p) flag has been deprecated and will be removed in a future version. Please use a positional argument for your prompt. See gemini --help for more information.\n',
-    );
-    expect(processStdoutSpy).toHaveBeenCalledWith('Final Answer');
-  });
-
-  it('should display a deprecation warning for JSON format', async () => {
-    const events: ServerGeminiStreamEvent[] = [
-      { type: GeminiEventType.Content, value: 'Final Answer' },
-      {
-        type: GeminiEventType.Finished,
-        value: { reason: undefined, usageMetadata: { totalTokenCount: 10 } },
-      },
-    ];
-    mockGeminiClient.sendMessageStream.mockReturnValue(
-      createStreamFromEvents(events),
-    );
-    vi.mocked(mockConfig.getOutputFormat).mockReturnValue(OutputFormat.JSON);
-
-    await runNonInteractive({
-      config: mockConfig,
-      settings: mockSettings,
-      input: 'Test input',
-      prompt_id: 'prompt-id-deprecated-json',
-      hasDeprecatedPromptArg: true,
-    });
-
-    const deprecateText =
-      'The --prompt (-p) flag has been deprecated and will be removed in a future version. Please use a positional argument for your prompt. See gemini --help for more information.\n';
-    expect(processStderrSpy).toHaveBeenCalledWith(deprecateText);
-  });
-
   it('should emit appropriate events for streaming JSON output', async () => {
     vi.mocked(mockConfig.getOutputFormat).mockReturnValue(
       OutputFormat.STREAM_JSON,

packages/cli/src/nonInteractiveCli.ts

@@ -51,7 +51,6 @@ interface RunNonInteractiveParams {
   settings: LoadedSettings;
   input: string;
   prompt_id: string;
-  hasDeprecatedPromptArg?: boolean;
   resumedSessionData?: ResumedSessionData;
 }
 
@@ -60,7 +59,6 @@ export async function runNonInteractive({
   settings,
   input,
   prompt_id,
-  hasDeprecatedPromptArg,
   resumedSessionData,
 }: RunNonInteractiveParams): Promise<void> {
   return promptIdContext.run(prompt_id, async () => {
@@ -264,21 +262,6 @@ export async function runNonInteractive({
       let currentMessages: Content[] = [{ role: 'user', parts: query }];
 
       let turnCount = 0;
-      const deprecateText =
-        'The --prompt (-p) flag has been deprecated and will be removed in a future version. Please use a positional argument for your prompt. See gemini --help for more information.\n';
-      if (hasDeprecatedPromptArg) {
-        if (streamFormatter) {
-          streamFormatter.emitEvent({
-            type: JsonStreamEventType.MESSAGE,
-            timestamp: new Date().toISOString(),
-            role: 'assistant',
-            content: deprecateText,
-            delta: true,
-          });
-        } else {
-          process.stderr.write(deprecateText);
-        }
-      }
       while (true) {
         turnCount++;
         if (