> ## 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.

# importThread

> Import a thread from an external system using its historical creation timestamp.
Unlike createThread, this mutation does not trigger SLAs or autoresponders, making it suitable for backfilling historical support data. The externalId is used for idempotency — re-importing the same ID returns NOOP. Requires the thread:import permission.