> ## 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.

# createThreadLink

> Links a thread to an external entity such as a Linear issue, Jira ticket, another Plain thread, or a Plain task. Provide exactly one of `linearIssue`, `jiraIssue`, `plainThread`, `plainTask`, or `sourceId`/`sourceType` for generic issue trackers. Returns an error with code `thread_link_already_exists` if the same link already exists for the thread.