Problem
All Gmail tools that accept file attachments (GMAIL_SEND_EMAIL, GMAIL_CREATE_EMAIL_DRAFT, GMAIL_REPLY_TO_THREAD) define the attachment parameter as a single object:
"attachment": {
"type": "object",
"properties": {
"name": { "type": "string" },
"mimetype": { "type": "string" },
"s3key": { "type": "string" }
}
}This means users can only attach one file per email. There is no way to send an email with multiple attachments — a very common real-world need.
The Gmail API itself has zero limitation here — RFC 2822 MIME multipart/mixed supports unlimited attachment parts (up to the 25MB total size limit).
Requested Change
Add an attachments field (array of file objects) to all Gmail tools that accept files:
"attachments": {
"type": "array",
"items": {
"type": "object",
"properties": {
"name": { "type": "string" },
"mimetype": { "type": "string" },
"s3key": { "type": "string" }
}
}
}Affected tools:
GMAIL_SEND_EMAILGMAIL_CREATE_EMAIL_DRAFTGMAIL_REPLY_TO_THREAD
Also missing:
GMAIL_UPDATE_DRAFT — there is no tool to update an existing draft. This would be useful for incrementally building emails with multiple attachments, or editing drafts before sending.
Context
Workaround Attempted
We considered creating a draft with attachment A, then updating with attachment B — but drafts.update in Gmail API is a full PUT (replaces entire message), so previous attachments are lost. And the singular attachment field means we can't pass [A, B] anyway.
The only current workaround is using the proxy tool to construct raw MIME messages, which defeats the purpose of having high-level tool abstractions.
Problem
All Gmail tools that accept file attachments (
GMAIL_SEND_EMAIL,GMAIL_CREATE_EMAIL_DRAFT,GMAIL_REPLY_TO_THREAD) define theattachmentparameter as a single object:This means users can only attach one file per email. There is no way to send an email with multiple attachments — a very common real-world need.
The Gmail API itself has zero limitation here — RFC 2822 MIME
multipart/mixedsupports unlimited attachment parts (up to the 25MB total size limit).Requested Change
Add an
attachmentsfield (array of file objects) to all Gmail tools that accept files:Affected tools:
GMAIL_SEND_EMAILGMAIL_CREATE_EMAIL_DRAFTGMAIL_REPLY_TO_THREADAlso missing:
GMAIL_UPDATE_DRAFT— there is no tool to update an existing draft. This would be useful for incrementally building emails with multiple attachments, or editing drafts before sending.Context
composio-clientREST API for Gmail/Drive/etc integrations. Multiple attachments is a frequently requested user need that we currently cannot fulfill.Workaround Attempted
We considered creating a draft with attachment A, then updating with attachment B — but
drafts.updatein Gmail API is a full PUT (replaces entire message), so previous attachments are lost. And the singularattachmentfield means we can't pass[A, B]anyway.The only current workaround is using the proxy tool to construct raw MIME messages, which defeats the purpose of having high-level tool abstractions.