Slack Now Supports Custom MCP Servers, Enabling 1,000+ App Integrations via Composio

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Slack recently introduced native MCP (Model Context Protocol) support for Slackbot, but its built-in marketplace currently offers only around 20 app integrations. To overcome this limitation, users can connect Slackbot to third-party MCP servers such as Composio Connect, which provides access to over 1,000 applications. The setup involves obtaining a hosted MCP server URL from Composio, registering it within a Slack app via the developer dashboard using OAuth-based Dynamic Client Registration, and installing the app to the desired workspace. Once configured, Slackbot can execute tasks across tools like Gmail, Notion, and Google Calendar directly from a Slack DM. This feature is available to Slack users on Business+ and Enterprise plans who have permission to create or configure Slack apps.

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