Function formatMessagesCompact

packages/mcp-server/src/format.ts:118–150

(messages: FormattableMessage[])

 * Filters out noise messages, merges same-sender runs, truncates long content.
 */
export function formatMessagesCompact(messages: FormattableMessage[]): string {
  if (messages.length === 0) return ''

  const valid = messages.filter((m) => m.content && isValidMessage(m.content))
  if (valid.length === 0) return ''

  const lines: string[] = []
  let prevSender = ''
  let pendingContents: string[] = []
  let pendingTs = 0

  const flush = () => {
    if (pendingContents.length === 0) return
    const combined = pendingContents.join('; ')
    const maxLen = pendingContents.length > 1 ? MAX_MERGED_CONTENT_LENGTH : MAX_CONTENT_LENGTH
    lines.push(`${formatTimestamp(pendingTs)} ${prevSender}: ${truncate(combined, maxLen)}`)
  }

  for (const msg of valid) {
    const content = msg.content!.trim()
    if (msg.senderName === prevSender) {
      pendingContents.push(content)
    } else {
      flush()
      prevSender = msg.senderName
      pendingContents = [content]
      pendingTs = msg.timestamp
    }
  }
  flush()

  return lines.join('\n')
}

/**
 * Try to parse a tool result's JSON content and convert to compact text.