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File attachments

Pass files or directories as an array like the following.
Memorizing this format is hard, so helpers are provided for convenience.

Blob attachments

Use the blob type to attach Base64-encoded data inline. This lets you send binary data such as images directly, without any disk I/O.
selection is not yet documented in the official SDK, so the details are unclear. github_reference also lacks official documentation and is planned for future support.
For the latest updates, see the GitHub repository.
Last modified on August 2, 2026