Documentation Index
Fetch the complete documentation index at: /llms.txt
Use this file to discover all available pages before exploring further.
Look up Attachment MIME types, metadata, size limits, and download safety headers.
| Rule | Value |
|---|---|
| MIME shape | type/subtype using MIME token characters, without parameters |
| Length | Up to 255 characters |
| Case | Normalized to lowercase |
| Public URL import | Keeps a valid declared type; otherwise uses application/octet-stream |
| Header | Value |
|---|---|
Content-Type | The stored type |
X-Content-Type-Options | nosniff |
Content-Security-Policy | sandbox; default-src 'none' |
Referrer-Policy | no-referrer |
Cache-Control | private, no-store |
Content-Disposition | inline for image/*, audio/*, video/*, and application/pdf; attachment for every other type |
| Field | Requirement |
|---|---|
filename | Required, 1 to 255 characters with no surrounding whitespace |
content_type | Required MIME type |
size_bytes | Required exact integer byte length |
duration_ms | Optional nonnegative integer, accepted for audio or video |
width, height | Optional positive integer pixels, supplied together, accepted for images or video |
| Boundary | Value |
|---|---|
| Allocation size | 1 byte to 100 MiB (104,857,600 bytes) |
| Public HTTPS media import | 1 byte to 10 MiB (10,485,760 bytes) |
| Public URL media parts per message | 40 |
| Total parts per message | 100 |
| Upload URL lifetime | 15 minutes |
| Download URL lifetime | 60 minutes from issuance |
image/* Attachment.