duolingo/slack-mcp ? reverse-engineered prompt

Build me a read only Slack MCP server that I can connect to my AI client over HTTP. It should let a user sign in with Slack using OAuth, then expose a few simple tools for browsing Slack safely, like getting channel messages, reading thread replies, searching messages, listing users, and listing channels. I want it to work for multiple users, so each person can authenticate with their own Slack workspace access.

Make it easy to run locally, with clear environment variables for the Slack app credentials and the public URL needed for the OAuth callback. If needed, include the setup for using an HTTPS tunnel during local development, since Slack requires that for login. I also want it to be easy to deploy in Docker for production. Keep the server simple and reliable, and make sure it only reads data, not posts anything back to Slack.