n8n Workflow: Slack Thread to Traceable PowerPoint Briefs

Turn a Slack thread into a traceable PowerPoint brief—automatically

This n8n workflow converts a Slack thread (or a pasted conversation via an n8n form) into a downloadable .pptx brief generated with Anthropic Claude, then verifies every slide item against quoted source messages before posting the deck back to Slack.

What this workflow does

• Triggers when someone mentions the Slack app in a thread or submits the n8n form with a pasted conversation.
• Builds a clean transcript from the Slack thread replies (including participant name lookup via the Slack Web API), excluding bots and the original request message.
• Applies transcript formatting and purpose, using the Slack mention text or a form field to set the brief’s slide purpose.
• Generates a JSON brief with Claude (title, background, discussion points, decisions needed, next steps), with each item containing exact quotes and message numbers as sources.
• Validates traceability by checking that each quoted snippet exists in the transcript and that any numbers/dates/owners are supported by the cited messages—dropping any untraceable fields or items.
• Creates the .pptx file by writing Office Open XML slide parts, zipping them into a PowerPoint deck.
• Returns the output by uploading the deck back to the originating Slack thread (including a summary of included vs. dropped items) or returning it as the n8n form response.

Use cases

• Convert asynchronous design or product Slack discussions into a traceable PowerPoint brief for stakeholders.
• Generate meeting briefs from long Slack threads while ensuring every slide claim is sourced.
• Support SaaS ops and automation engineers by turning requests into consistent decks with audit-ready citations.

Technical details

• Integrations: Slack (Slack app + Slack Web API) and Anthropic Claude.
• n8n nodes used: if, set, code, form, slack, switch.
• Outputs: a generated .pptx deck via Office Open XML slide parts, posted to Slack or returned through the form.