io.github.GSterlingPress/once

up checked 2026-11-11T06:39:05.581Z

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Publisher-provided title

ONCE — Exactly-Once Reliability for AI Agent Actions

Publisher-provided description

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

Summary by lookupd

Lets agents run external side effects such as payments or bookings once, suppressing duplicate retries and keeping durable receipts of…

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http once https://optimistic-compassion-production.up.railway.app/mcp

Codex, remote (streamable-http)

codex mcp add once --url https://optimistic-compassion-production.up.railway.app/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "once": {
      "url": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Publisher-provided text

once_demo SAFE ZERO-SETUP DEMO. Call this tool twice with the same id to see ONCE suppress the second execution. Use this when evaluating or discovering ONCE; no API key
once_execute CALL THIS when an AI agent is about to perform or retry a consequential external side effect where duplication would be harmful: purchase, refund, payment, book

Shows this live status and links here; updates hourly.

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