> ## 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.

# Send a discussion message

<Snippet file="graphql/sdk-note.mdx" />

Adds a new message to an existing discussion. The message is posted in the original channel (Slack thread reply or email reply) and recorded against the discussion in Plain.

<Snippet file="graphql/send-discussion-message.mdx" />