Function getLastPeerDmSummary

src/utils/teammateMailbox.ts:1149–1183

(messages: Message[])

 * Returns undefined when the turn didn't end with a peer DM.
 */
export function getLastPeerDmSummary(messages: Message[]): string | undefined {
  for (let i = messages.length - 1; i >= 0; i--) {
    const msg = messages[i]
    if (!msg) continue

    // Stop at wake-up boundary: a user prompt (string content), not tool results (array content)
    if (msg.type === 'user' && typeof msg.message.content === 'string') {
      break
    }

    if (msg.type !== 'assistant') continue
    for (const block of msg.message.content) {
      if (
        block.type === 'tool_use' &&
        block.name === SEND_MESSAGE_TOOL_NAME &&
        typeof block.input === 'object' &&
        block.input !== null &&
        'to' in block.input &&
        typeof block.input.to === 'string' &&
        block.input.to !== '*' &&
        block.input.to.toLowerCase() !== TEAM_LEAD_NAME.toLowerCase() &&
        'message' in block.input &&
        typeof block.input.message === 'string'
      ) {
        const to = block.input.to
        const summary =
          'summary' in block.input && typeof block.input.summary === 'string'
            ? block.input.summary
            : block.input.message.slice(0, 80)
        return `[to ${to}] ${summary}`
      }
    }
  }
  return undefined
}