TL;DR
ONCE is a Model Context Protocol (MCP) server. Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts. Install with: Remote MCP: https://optimistic-compassion-production.up.railway.app/mcp. Source: https://github.com/GSterlingPress/once-api. It speaks the Model Context Protocol and works with any compatible client (Claude, Cursor, Cline, Windsurf, Warp and more).
ONCE
Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
Install Command
Remote MCP: https://optimistic-compassion-production.up.railway.app/mcpFrequently Asked Questions
ONCE is a Model Context Protocol server that Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
You can install it by running the install command: `Remote MCP: https://optimistic-compassion-production.up.railway.app/mcp`. It then becomes available to any MCP-compatible client such as Claude, Cursor, Cline, Windsurf, Warp.
The ONCE MCP Server is compatible with any client that speaks the Model Context Protocol — including Claude, Cursor, Cline, Windsurf, Warp.
Check the project license on its repository before use.
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- Last Updated
- Aug 12, 2026
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Client Compatibility
Speaks the Model Context Protocol — works with any compatible client.