Function extractFirstMessageText

src/utils/fingerprint.ts:16–38

(
  messages: (UserMessage | AssistantMessage)[],
)

 * @returns First text content, or empty string if not found
 */
export function extractFirstMessageText(
  messages: (UserMessage | AssistantMessage)[],
): string {
  const firstUserMessage = messages.find(msg => msg.type === 'user')
  if (!firstUserMessage) {
    return ''
  }

  const content = firstUserMessage.message.content

  if (typeof content === 'string') {
    return content
  }

  if (Array.isArray(content)) {
    const textBlock = content.find(block => block.type === 'text')
    if (textBlock && textBlock.type === 'text') {
      return textBlock.text
    }
  }

  return ''
}

/**
 * Computes 3-character fingerprint for Claude Code attribution.