# Someone shipped an open source alternative to Claude in Slack. 1 day after An...
Canonical: https://social-archive.org/yena/RdH1zdsQvM
Original URL: https://x.com/techNmak/status/2071934268675412151
Author: Tech with Mak
Platform: x
## Content
Someone shipped an open source alternative to Claude in Slack. 1 day after Anthropic launched it. It's called OpenTag. What you get: → Generative UI - renders charts, tables, and components inline inside Slack → Streaming replies with full thread context → Human-in-the-loop approval gates - agent waits for you before acting → One codebase. Slack, MS Teams, Discord, Telegram, WhatsApp. → MIT license - fully hackable The entire agent behavior is controlled by one system prompt. Rewrite it, you have a completely different agent. Built on CopilotKit's open SDK. 35k+ GitHub stars. Created the AG-UI protocol. Clone it, point it at your model and tools, and you own the whole stack.