n8n Reddit RSS → OpenAI Reply Drafts to Slack (Daily)

Get daily, AI-drafted Reddit replies in Slack—automatically

This n8n workflow runs every morning at 9am, pulls fresh posts from selected Reddit subreddits via Reddit RSS, uses OpenAI (via LangChain) to shortlist the most worth answering, drafts helpful replies, and posts the results directly to your Slack channel.

What this workflow does

• Scheduled monitoring: Executes daily at 9am.
• Reads Reddit RSS feeds: Builds /new/.rss feed URLs for your configured subreddits and fetches recent items.
• Lookback + cleanup: Filters posts to only those published within your configured lookbackHours, then trims each post to a clean, short text payload.
• OpenAI selection + reply drafting: Bundles recent posts into a single JSON input and asks an OpenAI chat model to select up to maxThreads threads and draft non-promotional replies.
• Slack publishing: If threads are selected, posts one Slack message per thread with the title, link, rationale, and the drafted reply.
• No results notice: If nothing is selected, posts a Slack message stating that nothing worth answering was found.

Use cases

• SaaS teams monitoring community discussions and responding quickly from Reddit to improve engagement.
• Automation engineers creating an n8n “AI triage + draft” pipeline for daily community support.
• Operators who want a consistent workflow: review drafts in Slack, approve, and post.

Technical details

• Integrations: Reddit RSS, OpenAI (via LangChain), and Slack.
• Workflow nodes: if, set, code, slack, filter, split out.
• Setup checklist: Add OpenAI credentials to the OpenAI chat model node, add a Slack credential and target channel for both Slack posting steps, and update the subreddit list, lookbackHours, and maxThreads in the configuration step.