Slack

Connects to Slack's API to give Claude full read and write access to your workspace. You get the obvious stuff like sending messages, searching conversations, and fetching thread history, but also deeper operations like managing user profiles, scheduling messages, uploading files, and handling reactions. Usage data shows fetch_conversation_history and fetch_message_thread dominating the call volume, which tracks with how most people actually use it: pulling context into Claude before taking action. Useful when you need Claude to monitor channels, summarize threads, or post updates without switching windows. Handles OAuth through Smithery so you don't have to manage tokens yourself.