Discord only downloaded audio attachments before passing them to the agent. Non-audio attachments (images, videos, files) were passed as raw Discord CDN URLs, which do not flow through resolveMediaRefs and are not serialized as vision inputs.
Download every attachment, store it in the MediaStore with Discord's filename and content type metadata, and emit a media placeholder tag that matches the attachment kind. This lets resolveMediaRefs replace the placeholder with the local path-bearing tag and encode supported images for vision-capable providers. If a download fails, keep the previous raw URL fallback.
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