Add Slack PDF Summarizer Bot

[charlieatchime]

Summary

Adds a Slack bot that automatically detects when a PDF is shared in a channel and replies in a thread with a concise bullet-point summary of the document's key insights.

How it works

1. A user drops a PDF into any channel the bot is a member of.
2. The bot detects the PDF attachment, downloads it, and extracts the text using pdf-parse.
3. The extracted text is sent to OpenAI (GPT-4o by default) with a prompt tuned to produce 3–7 bullet points of key insights.
4. The summary is posted as a threaded reply on the original message.
5. If multiple PDFs are shared in one message, they are all summarized concurrently.

Stack

• @slack/bolt — Slack event handling via Socket Mode
• pdf-parse — text extraction from PDF buffers
• openai — GPT-4o-powered summarization

Files added

File	Purpose
slack-pdf-summarizer/src/app.js	Main Slack Bolt app — listens for messages with PDF attachments
slack-pdf-summarizer/src/pdf-extractor.js	Extracts text from PDF buffers
slack-pdf-summarizer/src/summarizer.js	Sends extracted text to OpenAI for bullet-point summarization
slack-pdf-summarizer/README.md	Full setup instructions including Slack App configuration
slack-pdf-summarizer/.env.example	Environment variable template
slack-pdf-summarizer/package.json	Dependencies and scripts

Setup required

The README contains step-by-step instructions. In short:

1. Create a Slack App with Socket Mode and the required scopes (channels:history, chat:write, files:read, etc.)
2. Set environment variables (SLACK_BOT_TOKEN, SLACK_APP_TOKEN, SLACK_SIGNING_SECRET, OPENAI_API_KEY)
3. npm install && npm start
4. Invite the bot to channels where you want PDF summarization

Slack Thread