Function hasOnlyWhitespaceTextContent

src/utils/messages.ts:4835–4855

* Check if an assistant message has only whitespace-only text content blocks. * Returns true if all content blocks are text blocks with only whitespace. * Returns false if there are any non-text blocks (like tool_use) or text with actual content.

(
  content: Array<{ type: string; text?: string }>,
)

 * Returns false if there are any non-text blocks (like tool_use) or text with actual content.
 */
function hasOnlyWhitespaceTextContent(
  content: Array<{ type: string; text?: string }>,
): boolean {
  if (content.length === 0) {
    return false
  }

  for (const block of content) {
    // If there's any non-text block (tool_use, thinking, etc.), the message is valid
    if (block.type !== 'text') {
      return false
    }
    // If there's a text block with non-whitespace content, the message is valid
    if (block.text !== undefined && block.text.trim() !== '') {
      return false
    }
  }

  // All blocks are text blocks with only whitespace
  return true
}

/**
 * Filter out assistant messages with only whitespace-only text content.