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Google Chat: Get attachment metadata — MCP tool

Google Chat MCP tool: Fetches metadata of one message attachment — filename, MIME type, source and download references.

Technical name: get_attachment

What task it solves

I want to know what file is attached to a Google Chat message.

Returns contentName, contentType, source (DRIVE_FILE or UPLOADED_CONTENT), downloadUri/thumbnailUri and attachmentDataRef for one attachment.

When to use it

Use it with app (service-account) credentials to inspect an attachment by its resource name. With user credentials, read the same metadata from get_message's attachment[] field instead.

What to provide

  • attachment — required. The full name spaces/<space>/messages/<message>/attachments/<attachment> from a message's attachment[].name.

What it returns

One attachment metadata object. No file bytes — metadata only.

What changes in Google Chat

The tool reads Google Chat data and does not change it.

Example request

What file is attached to the last message in the reports space? Show its name and type.

Errors and limitations

The dedicated attachment endpoint accepts only APP (service-account) authentication — with user credentials it errors, but get_message already embeds the same metadata. downloadUri/thumbnailUri are short-lived links for a signed-in browser user, not for server-side download. Uploading and downloading raw bytes use the media/upload endpoints, which are outside this server's tools.

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Technical details