JustOnce is a Model Context Protocol (MCP) server: Persistent memory for AI assistants — one shared, OAuth-secured vault for every MCP client. In practice that means any MCP-compatible AI assistant can call JustOnce's tools directly — the model decides when to use them in a conversation or agent run.
It's a hosted (remote) server — point your client at https://mcp.justonce.ai and you're connected, with nothing to install locally. The current release is v1.0.0.
JustOnce is listed under Memory 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 JustOnce for justonce.ai, claim this listing to verify ownership, earn the Verified badge, and keep the details current.