Attachments

Capsules can include file attachments: screenshots, log files, config files, or any other supporting material.

Limits

• 25 MB per file
• 50 MB per capsule (total attachments)
• 200 MB total storage per user

Uploading

Attachments can be added when creating or updating a capsule:

• Web UI: drag and drop or use the file picker
• MCP Desktop: use create_capsule_with_attachments to attach local files directly from your AI conversation

Encryption

Attachments are not end-to-end encrypted, even on an encrypted capsule. The bytes are stored and served unencrypted, and anyone holding an attachment's URL can fetch them without a session, API key, or master key. This is deliberate — the server needs plaintext to generate thumbnails — so attachments sit outside the E2EE boundary that protects capsule content. Do not attach anything you would not store in plaintext. See End-to-End Encryption for exactly what is and isn't encrypted.

Expiration

Attachments expire after 30 days by default. A background job automatically cleans up expired files.

Supported Formats

Any file type is accepted within the size limits. Common use cases include:

• Screenshots of error messages or UI states
• Log files and stack traces
• Configuration files
• Data exports (CSV, JSON)