Slack API

The Slack API enables developers to build powerful apps and bots that automate tasks, integrate external services, and interact directly with Slack workspaces via the Web and Events APIs.

The Slack API is the core platform for extending Slack functionality: it lets you build custom applications, automations, and bots. It features the Web API (100+ HTTP methods for reading/writing data) and the Events API (for real-time responses to user activity). Developers use Block Kit to construct rich, interactive messages, modals, and App Home surfaces. Common use cases include posting automated alerts (e.g., a system monitoring bot flagging 80%+ CPU usage) or integrating third-party tools like CRMs and project management boards directly into the team's workflow. This is the engine for deep, custom workspace integration.

https://slack.dev/