> ## 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.

# threadFieldSchemas

> Returns all thread field schemas defined in the workspace, paginated. Use this to discover which custom fields exist and their configuration before reading or writing thread field values. Selecting the `createdBy`/`updatedBy` actor down to its `user` additionally requires the `user:read` permission; a token without it can query an empty workspace but starts failing once a schema exists and that selection is present.