Once MCP Server

Once is an MCP integration. Developer assessment/setup MCP; admitted Once boundaries protect writes, not sibling connectors.

Packages and local setup

The published npm package is @once-agent/mcp, version 0.2.1. Its declared MCP transport is stdio.

The package declares ONCE_API_KEY: Optional key for Cloud checks. Without it once_verify_connection reports Cloud unconfigured/unverified and preserves local diagnostics..

Before connecting

Check the maintainer’s instructions for account access, authentication and the supported client configuration. Once connected, inspect the tools your client receives and try a small task that matches the server’s stated purpose. The registry description does not include a verified, complete tool list.

Project and source

View the publisher’s registry entry · Project repository. This profile uses version 0.2.1 from the registry. Registration identifies the publisher namespace; it does not establish that this is a first-party integration for every service it connects.

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