Function stripExcessMediaItems

src/services/api/claude.ts:956–1015

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

 * Strips oldest media first to preserve the most recent.
 */
export function stripExcessMediaItems(
  messages: (UserMessage | AssistantMessage)[],
  limit: number,
): (UserMessage | AssistantMessage)[] {
  let toRemove = 0
  for (const msg of messages) {
    if (!Array.isArray(msg.message.content)) continue
    for (const block of msg.message.content) {
      if (isMedia(block)) toRemove++
      if (isToolResult(block) && Array.isArray(block.content)) {
        for (const nested of block.content) {
          if (isMedia(nested)) toRemove++
        }
      }
    }
  }
  toRemove -= limit
  if (toRemove <= 0) return messages

  return messages.map(msg => {
    if (toRemove <= 0) return msg
    const content = msg.message.content
    if (!Array.isArray(content)) return msg

    const before = toRemove
    const stripped = content
      .map(block => {
        if (
          toRemove <= 0 ||
          !isToolResult(block) ||
          !Array.isArray(block.content)
        )
          return block
        const filtered = block.content.filter(n => {
          if (toRemove > 0 && isMedia(n)) {
            toRemove--
            return false
          }
          return true
        })
        return filtered.length === block.content.length
          ? block
          : { ...block, content: filtered }
      })
      .filter(block => {
        if (toRemove > 0 && isMedia(block)) {
          toRemove--
          return false
        }
        return true
      })

    return before === toRemove
      ? msg
      : {
          ...msg,
          message: { ...msg.message, content: stripped },
        }