Function getPreviousRequestIdFromMessages

src/services/api/claude.ts:928–938

* Extracts the request ID from the most recent assistant message in the * conversation. Used to link consecutive API requests in analytics so we can * join them for cache-hit-rate analysis and incremental token tracking. * * Deriving this from the message array (rather than global state) ensures

(
  messages: Message[],
)

 * independently, and rollback/undo naturally updates the value.
 */
function getPreviousRequestIdFromMessages(
  messages: Message[],
): string | undefined {
  for (let i = messages.length - 1; i >= 0; i--) {
    const msg = messages[i]!
    if (msg.type === 'assistant' && msg.requestId) {
      return msg.requestId
    }
  }
  return undefined
}

function isMedia(
  block: BetaContentBlockParam,