Function applySettingsChange

src/utils/settings/applySettingsChange.ts:33–92

(
  source: SettingSource,
  setAppState: (f: (prev: AppState) => AppState) => void,
)

 * `onChangeAppState` which fires when `settings` changes in state.
 */
export function applySettingsChange(
  source: SettingSource,
  setAppState: (f: (prev: AppState) => AppState) => void,
): void {
  const newSettings = getInitialSettings()

  logForDebugging(`Settings changed from ${source}, updating app state`)

  const updatedRules = loadAllPermissionRulesFromDisk()
  updateHooksConfigSnapshot()

  setAppState(prev => {
    let newContext = syncPermissionRulesFromDisk(
      prev.toolPermissionContext,
      updatedRules,
    )

    // Ant-only: re-strip overly broad Bash allow rules after settings sync
    if (
      process.env.USER_TYPE === 'ant' &&
      process.env.CLAUDE_CODE_ENTRYPOINT !== 'local-agent'
    ) {
      const overlyBroad = findOverlyBroadBashPermissions(updatedRules, [])
      if (overlyBroad.length > 0) {
        newContext = removeDangerousPermissions(newContext, overlyBroad)
      }
    }

    if (
      newContext.isBypassPermissionsModeAvailable &&
      isBypassPermissionsModeDisabled()
    ) {
      newContext = createDisabledBypassPermissionsContext(newContext)
    }

    newContext = transitionPlanAutoMode(newContext)

    // Sync effortLevel from settings to top-level AppState when it changes
    // (e.g. via applyFlagSettings from IDE). Only propagate if the setting
    // itself changed — otherwise unrelated settings churn (e.g. tips dismissal
    // on startup) would clobber a --effort CLI flag value held in AppState.
    const prevEffort = prev.settings.effortLevel
    const newEffort = newSettings.effortLevel
    const effortChanged = prevEffort !== newEffort

    return {
      ...prev,
      settings: newSettings,
      toolPermissionContext: newContext,
      // Only propagate a defined new value — when the disk key is absent
      // (e.g. /effort max for non-ants writes undefined; --effort CLI flag),
      // prev.settings.effortLevel can be stale (internal writes suppress the
      // watcher that would resync AppState.settings), so effortChanged would
      // be true and we'd wipe a session-scoped value held in effortValue.
      ...(effortChanged && newEffort !== undefined
        ? { effortValue: newEffort }
        : {}),
    }