> ## Documentation Index
> Fetch the complete documentation index at: https://www.plain.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# bulkUpsertThreadFields

> Upserts up to 25 thread field values in a single call — useful when setting multiple fields on one or more threads at once. Each entry is independently created or updated; a validation error on the batch as a whole is returned if any entry is invalid. Requires the `threadField:create` and `threadField:update` permissions.