Haystack's intranet MCP server expands to ChatGPT, Copilot and Slack
Haystack, an intranet platform for large companies, has extended its Model Context Protocol (MCP) server from Claude to ChatGPT, Microsoft Copilot Studio and Slack. According to the company, write access on all four platforms starts on Monday, October 26, so employees can create content as well as find it.
- Haystack's MCP server, launched in Claude in August, now also works in ChatGPT, Microsoft Copilot Studio and Slack.
- Write access on all four platforms opens on October 26, letting employees draft knowledge pages and posts.
- Each connection authenticates as the individual employee, so assistants only see and publish what that person is allowed to.
- Write access is optional, admins can block individual tools, and no customer data is used to train AI models, according to Haystack.
- The ChatGPT, Copilot and Slack connectors are available now to Haystack customers.
From Claude to four platforms
Haystack's MCP server first launched in Claude in August. It is now available in ChatGPT, Microsoft Copilot Studio and the Slack Marketplace. According to Haystack, when an employee asks a question in any of the four, the answer comes from the intranet and is described as current, approved, permission-aware and linked to its source in Haystack.
Setup is handled by an admin, who connects Haystack in a few steps. Each employee then signs in with their own Haystack account. The ChatGPT, Copilot and Slack connectors are available now to Haystack customers.
Write access: drafting pages and posts
The October 26 update adds the ability to create content from the AI assistant. According to the company, an assistant can draft a knowledge page and save it as a private page for the person who asked. It can also write a post for any group the employee can publish to, and then either save it as a draft or publish it.
Haystack points to a combined use case: because these assistants also connect to systems such as Salesforce, a head of sales could turn the quarter's numbers into a company-wide digest in minutes. The company says every step respects the permissions of both the source system and Haystack.
Cameron Lindsay, founder and CEO of Haystack, said: "In August, we brought the intranet into Claude so employees could get answers without leaving their AI assistant." He added that writing to it was next, and that in each of the four tools "people can both find company knowledge and publish it from the same single source of truth."
Security and control
Haystack states that it is SOC 2 Type 1 & 2, ISO 27001 and HIPAA compliant. Every connection authenticates as the individual employee, so an AI assistant sees only what that employee can see and publishes only where they can.
- Write access is optional.
- Admins can block individual tools in their AI assistant.
- No customer data is used to train AI models, according to the company.
Haystack also notes that because MCP is an open standard, there is no lock-in to a single AI vendor.
What it means for Haystack customers
For organizations already using Haystack, the change means employees do not have to open the intranet to work with it. They can ask questions and publish from the AI assistant or messaging tool they already use, whether that is Claude, ChatGPT, Copilot or Slack. Admins keep control over which tools are enabled and whether write access is used at all.
Haystack describes itself as an internal communications platform that unites company news, knowledge and people in one hub reachable on the web, in a custom-branded mobile app and on digital signage. It lists Weight Watchers, Thumbtack, GoodRx and NerdWallet among its customers. The company invites interested organizations to schedule a demo.
