Haystack's MCP Server Now Works in Claude, ChatGPT, Copilot and Slack, With New Write Access Across All Four

Employees can now get intranet answers in ChatGPT, Microsoft Copilot and Slack, and starting October 26 can create pages and posts from all four. VENICE, Calif., Oct. 22, 2026 /PRNewswire/ -- Haystack, the modern intranet platform that makes big companies feel smaller, today announced expansions to its Model Context Protocol (MCP) server. It now works in OpenAI's ChatGPT, Microsoft Copilot Studio, and Slack, joining Anthropic's Claude. And starting Monday, October 26, it adds write access on all four, so employees can create content as well as find it. Haystack's MCP server launched in Claude in August. It is now available in ChatGPT, Microsoft Copilot Studio, and the Slack Marketplace.

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