piebald-ai--claude-code-system-prompts/system-prompts/tool-parameter-sendusermessage-attachments.md

Optional attachments for the user to see alongside your message. Each entry is either a file path (absolute or relative to cwd) for a file you can read locally, or a pre-resolved {file_uuid, file_name, size, is_image} object you obtained from a device tool such as attach_file.