When a path to an image is provided to the agent, I've observed three erroneous behaviors:

• It reads the file as a plain text file and attempts to interpret the output
• It reads the file as a plain text file and hallucinates something completely random
• Reading file failed: Internal error

Including an image using @ works just fine, but it can be convenient to reference paths, too. Doing so works in the Claude Code CLI as well as when using the Codex ACP adapter.