Function REPL

src/screens/REPL.tsx:572–5005

({
  commands: initialCommands,
  debug,
  initialTools,
  initialMessages,
  pendingHookMessages,
  initialFileHistorySnapshots,
  initialContentReplacements,
  initialAgentName,
  initialAgentColor,
  mcpClients: initialMcpClients,
  dynamicMcpConfig: initialDynamicMcpConfig,
  autoConnectIdeFlag,
  strictMcpConfig = false,
  systemPrompt: customSystemPrompt,
  appendSystemPrompt,
  onBeforeQuery,
  onTurnComplete,
  disabled = false,
  mainThreadAgentDefinition: initialMainThreadAgentDefinition,
  disableSlashCommands = false,
  taskListId,
  remoteSessionConfig,
  directConnectConfig,
  sshSession,
  thinkingConfig
}: Props)

};
export type Screen = 'prompt' | 'transcript';
export function REPL({
  commands: initialCommands,
  debug,
  initialTools,
  initialMessages,
  pendingHookMessages,
  initialFileHistorySnapshots,
  initialContentReplacements,
  initialAgentName,
  initialAgentColor,
  mcpClients: initialMcpClients,
  dynamicMcpConfig: initialDynamicMcpConfig,
  autoConnectIdeFlag,
  strictMcpConfig = false,
  systemPrompt: customSystemPrompt,
  appendSystemPrompt,
  onBeforeQuery,
  onTurnComplete,
  disabled = false,
  mainThreadAgentDefinition: initialMainThreadAgentDefinition,
  disableSlashCommands = false,
  taskListId,
  remoteSessionConfig,
  directConnectConfig,
  sshSession,
  thinkingConfig
}: Props): React.ReactNode {
  const isRemoteSession = !!remoteSessionConfig;

  // Env-var gates hoisted to mount-time — isEnvTruthy does toLowerCase+trim+
  // includes, and these were on the render path (hot during PageUp spam).
  const titleDisabled = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_TERMINAL_TITLE), []);
  const moreRightEnabled = useMemo(() => "external" === 'ant' && isEnvTruthy(process.env.CLAUDE_MORERIGHT), []);
  const disableVirtualScroll = useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL), []);
  const disableMessageActions = feature('MESSAGE_ACTIONS') ?
  // biome-ignore lint/correctness/useHookAtTopLevel: feature() is a compile-time constant
  useMemo(() => isEnvTruthy(process.env.CLAUDE_CODE_DISABLE_MESSAGE_ACTIONS), []) : false;

  // Log REPL mount/unmount lifecycle
  useEffect(() => {
    logForDebugging(`[REPL:mount] REPL mounted, disabled=${disabled}`);
    return () => logForDebugging(`[REPL:unmount] REPL unmounting`);
  }, [disabled]);

  // Agent definition is state so /resume can update it mid-session
  const [mainThreadAgentDefinition, setMainThreadAgentDefinition] = useState(initialMainThreadAgentDefinition);
  const toolPermissionContext = useAppState(s => s.toolPermissionContext);
  const verbose = useAppState(s => s.verbose);
  const mcp = useAppState(s => s.mcp);
  const plugins = useAppState(s => s.plugins);
  const agentDefinitions = useAppState(s => s.agentDefinitions);
  const fileHistory = useAppState(s => s.fileHistory);
  const initialMessage = useAppState(s => s.initialMessage);
  const queuedCommands = useCommandQueue();
  // feature() is a build-time constant — dead code elimination removes the hook
  // call entirely in external builds, so this is safe despite looking conditional.
  // These fields contain excluded strings that must not appear in external builds.
  const spinnerTip = useAppState(s => s.spinnerTip);