mcp-u

Manufact (formerly known by its open-source SDK mcp-use) is a YC S25-backed developer tools company building cloud infrastructure for the Model Context Protocol (MCP). Founded in Zurich and now headquartered in San Francisco, the company created the mcp-use open-source SDK which crossed 10,000 GitHub stars and 50,000 weekly downloads. Manufact's cloud platform enables development teams to build, deploy, test, and monitor MCP servers and MCP Apps for AI agents — positioning itself as the Vercel of MCP. The platform supports submission to both the Claude Connector marketplace and the ChatGPT App Store, and includes automated testing that installs servers in AI clients to verify compliance. Manufact is listed as an official deployment option in OpenAI's documentation for ChatGPT Apps and raised a $6.3M seed round before YC Demo Day. The company's technology enables interactive UI to be returned from MCP tool calls, allowing AI chat interfaces to display charts, forms, and dashboards rather than plain text.