Hi @David_Picknell!
Right now Grok Bot resizes every image an MCP tool returns so its longest side is at most 1024 px, before the bot sees it. The copy it saves to disk is that resized one, so the original bytes never reach the bot’s computer. Changing the connector instructions can’t get around that.
As a workaround, have the tool also return the full-resolution JPEG as a download link (or a file path the bot can reach) in its text output. The bot can then download the original with a shell command instead of decoding the image block.
I’ve passed this to the team.