    servers/
        development/
        once
  

ONCE

Unverified Claim & verify → Development

Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.

View on GitHub ↗ Try Remote Server

Overview Installation

Overview

ONCE is a Model Context Protocol (MCP) server: Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts. As an MCP server it plugs straight into AI assistants, exposing its functionality as tools the model can invoke on your behalf.

It's a hosted (remote) server — point your client at https://optimistic-compassion-production.up.railway.app/mcp and you're connected, with nothing to install locally. The current release is v0.8.0, with source at GSterlingPress/once-api on GitHub.

You'll find ONCE in the Development category here on mcp.site; it connects to Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and any other MCP client — see the install snippets below. If you maintain ONCE for GSterlingPress, claim this listing to verify ownership, earn the Verified badge, and keep the details current.

▸Hosted endpoint — Streamable HTTP · https://optimistic-compassion-production.up.railway.app/mcp

Installation

Settings → Connectors → Add custom connector
Name: ONCE
URL:  https://optimistic-compassion-production.up.railway.app/mcp

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