Function stripImagesFromMessages

src/services/compact/compact.ts:145–200

(messages: Message[])

 * and thinking blocks but not images.
 */
export function stripImagesFromMessages(messages: Message[]): Message[] {
  return messages.map(message => {
    if (message.type !== 'user') {
      return message
    }

    const content = message.message.content
    if (!Array.isArray(content)) {
      return message
    }

    let hasMediaBlock = false
    const newContent = content.flatMap(block => {
      if (block.type === 'image') {
        hasMediaBlock = true
        return [{ type: 'text' as const, text: '[image]' }]
      }
      if (block.type === 'document') {
        hasMediaBlock = true
        return [{ type: 'text' as const, text: '[document]' }]
      }
      // Also strip images/documents nested inside tool_result content arrays
      if (block.type === 'tool_result' && Array.isArray(block.content)) {
        let toolHasMedia = false
        const newToolContent = block.content.map(item => {
          if (item.type === 'image') {
            toolHasMedia = true
            return { type: 'text' as const, text: '[image]' }
          }
          if (item.type === 'document') {
            toolHasMedia = true
            return { type: 'text' as const, text: '[document]' }
          }
          return item
        })
        if (toolHasMedia) {
          hasMediaBlock = true
          return [{ ...block, content: newToolContent }]
        }
      }
      return [block]
    })

    if (!hasMediaBlock) {
      return message
    }

    return {
      ...message,
      message: {
        ...message.message,
        content: newContent,
      },
    } as typeof message
  })
}

/**