> ## 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.

# createThreadDiscussion

> Start a new discussion on a Plain thread. Supports Slack (posts a new thread in a connected Slack channel),
Email (sends an outbound email chain), and Cursor workspace background agent discussions.
The markdownContent field is sent as the opening message; for Slack discussions you may also supply
slackBlocks (JSON-encoded Block Kit array) for rich Slack formatting while markdownContent serves as the
Plain UI fallback. Prefer createDiscussion for new integrations.