Function isBriefEntitled

src/tools/BriefTool/BriefTool.ts:88–100

()

 * the env var alone also sets userMsgOptIn via maybeActivateBrief().
 */
export function isBriefEntitled(): boolean {
  // Positive ternary — see docs/feature-gating.md. Negative early-return
  // would not eliminate the GB gate string from external builds.
  return feature('KAIROS') || feature('KAIROS_BRIEF')
    ? getKairosActive() ||
        isEnvTruthy(process.env.CLAUDE_CODE_BRIEF) ||
        getFeatureValue_CACHED_WITH_REFRESH(
          'tengu_kairos_brief',
          false,
          KAIROS_BRIEF_REFRESH_MS,
        )
    : false
}

/**
 * Unified activation gate for the Brief tool. Governs model-facing behavior