Function createCachedSystemMessage

src/common/utils/ai/cacheStrategy.ts:122–136

(
  systemContent: string,
  modelString: string,
  cacheTtl?: AnthropicCacheTtl | null
)

 * System messages rarely change and should always be cached.
 */
export function createCachedSystemMessage(
  systemContent: string,
  modelString: string,
  cacheTtl?: AnthropicCacheTtl | null
): ModelMessage | null {
  if (!systemContent || !supportsAnthropicCache(modelString)) {
    return null;
  }

  return {
    role: "system" as const,
    content: systemContent,
    providerOptions: cacheTtl ? anthropicCacheControl(cacheTtl) : ANTHROPIC_CACHE_CONTROL,
  };
}

/**
 * Apply cache control to tool definitions for Anthropic models.