AIでカードに添付したファイルを読み込ませる方法をご教授ください

Hi @桝谷, :)
Hope you are doing well,
Welcome to the community!!

As @Tomislav Tobijas suggested, we don't have support to read card attachments on our MCP yet.

There are two ways to have AI read the files attached to your Trello cards right now.

Manual option: simply download the attachment from your Trello card and upload it directly to your AI tool of choice (Claude, ChatGPT, etc.). Trello's native AI (Atlassian Intelligence) works on text in card descriptions and comments, but reading attached files directly is not yet supported.

API option, you can use the Trello REST API to download the attachment and then pass it to your AI tool. First, retrieve the attachment list with GET https://api.trello.com/1/cards/{cardID}/attachments?key=APIKey&token=APIToken, then download the file using the /cards/{cardID}/attachments/{attachmentID}/download/{filename} endpoint with an Authorisation header (note: query parameter auth is not supported on the download endpoint).
Full details are in the API reference: The Trello REST API and https://community.developer.atlassian.com/t/update-authenticated-access-to-s3/43681/8

Thanks.