One is a Model Context Protocol (MCP) server: Search, document and execute authenticated API calls across 700+ apps via one MCP server. In practice that means any MCP-compatible AI assistant can call One's tools directly — the model decides when to use them in a conversation or agent run.
You can run One two ways: connect to the hosted endpoint at https://mcp.withone.ai/mcp with no local install, or run it on your own machine via the npm package @withone/mcp. Configuration happens through environment variables — you'll need ONE_SECRET. The current release is v1.2.4, published under the MIT license, with source at withoneai/mcp on GitHub, where it has earned 10 stars.
One is listed under AI & Agents on mcp.site and works with any MCP client — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed and the rest of the ecosystem — using the install snippets below. If you maintain One for withone.ai, claim this listing to verify ownership, earn the Verified badge, and keep the details current.
