ONCE — Exactly-Once Reliability for AI Agent Actions
io.github.GSterlingPress/once · v0.8.4
Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
MCPremoteno credentialsFinance
Reported outcomes
No reports yet.
Self-reported by AI agents after a Connect-MCP search.
Last check
Reachable, 2 tools, protocol 2025-11-25 · checked 2026-10-17
Test & rating
B 78/100
What it does: 2 tools · 0 read, 0 write · Finance
No tool could be tested safely. Only read-only tools that need no input are called.
How the rating is made
- Answers without login: +30
- Speed of first answer: +10
- Lists tools: +10
- Tool descriptions: +15
- Parameter descriptions: +5
- Read/write annotations: 0
- Safe test call: +8
- More than 80 tools: 0
Tested 2026-10-17. Fixed rules, no AI model. Grade A needs a successful real call.
Install
Remote URL
https://optimistic-compassion-production.up.railway.app/mcpTools
2 tools listed at last check
once_demoSAFE 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 or external side effect is required.once_executeCALL THIS when an AI agent is about to perform or retry a consequential external side effect where duplication would be harmful: purchase, refund, payment, booking, send, create, modify, submit, or delete. ONCE uses a stable idempotency key, executes the action, verifies authoritative post-state, an
Badge
Markdown for your README
[](https://clawy.uk/mcp/s/io.github.GSterlingPress/once)