Function logAPIPrefix

source code/utils/api.ts:283–296

(systemPrompt: SystemPrompt)

 * (see https://console.statsig.com/4aF3Ewatb6xPVpCwxb5nA3/dynamic_configs/claude_cli_system_prompt_prefixes)
 */
export function logAPIPrefix(systemPrompt: SystemPrompt): void {
  const [firstSyspromptBlock] = splitSysPromptPrefix(systemPrompt)
  const firstSystemPrompt = firstSyspromptBlock?.text
  logEvent('tengu_sysprompt_block', {
    snippet: firstSystemPrompt?.slice(
      0,
      20,
    ) as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    length: firstSystemPrompt?.length ?? 0,
    hash: (firstSystemPrompt
      ? createHash('sha256').update(firstSystemPrompt).digest('hex')
      : '') as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
  })
}

/**
 * Split system prompt blocks by content type for API matching and cache control.