Function getMergedBetas

src/utils/betas.ts:397–428

(
  model: string,
  options?: { isAgenticQuery?: boolean },
)

 *   non-agentic calls (compaction, classifiers, token estimation) don't need them.
 */
export function getMergedBetas(
  model: string,
  options?: { isAgenticQuery?: boolean },
): string[] {
  const baseBetas = [...getModelBetas(model)]

  // Agentic queries always need claude-code and cli-internal beta headers.
  // For non-Haiku models these are already in baseBetas; for Haiku they're
  // excluded by getAllModelBetas() since non-agentic Haiku calls don't need them.
  if (options?.isAgenticQuery) {
    if (!baseBetas.includes(CLAUDE_CODE_20250219_BETA_HEADER)) {
      baseBetas.push(CLAUDE_CODE_20250219_BETA_HEADER)
    }
    if (
      process.env.USER_TYPE === 'ant' &&
      process.env.CLAUDE_CODE_ENTRYPOINT === 'cli' &&
      CLI_INTERNAL_BETA_HEADER &&
      !baseBetas.includes(CLI_INTERNAL_BETA_HEADER)
    ) {
      baseBetas.push(CLI_INTERNAL_BETA_HEADER)
    }
  }

  const sdkBetas = getSdkBetas()

  if (!sdkBetas || sdkBetas.length === 0) {
    return baseBetas
  }

  // Merge SDK betas without duplicates (already filtered by filterAllowedSdkBetas)
  return [...baseBetas, ...sdkBetas.filter(b => !baseBetas.includes(b))]
}

export function clearBetasCaches(): void {
  getAllModelBetas.cache?.clear?.()