bots.st/once-exactly-once-reliability-for-ai-agent-actio
ONCE — Exactly-Once Reliability for AI Agent Actions
Durable receipts and idempotent side effects
1940 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-11-25
- Tools listed
- 2
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://optimistic-compassion-production.up.railway.app/mcp
What it can do
| Tool | What it says it does |
|---|---|
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 or external side effect is required. |
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, booking, send, create, modify, submit, or delete. ONCE uses a stable idempotency key, executes the action, verifies authoritative post-state… |
In its maker's words
Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.
- Website
- github.com/GSterlingPress/once-api
- Source
- github.com/GSterlingPress/once-api
- Publisher
- GSterlingPress (6 listings in the registry)
- Listed from
- the official MCP Registry as
io.github.GSterlingPress/once - Version
- 0.8.4, updated 13 Sep 2026
- Kinds of work
- ai-models-and-agents, security-and-trust, cloud-and-devops
The domain it lives on
- github.com
- registered 9 Oct 2007 (19 years ago), at MarkMonitor Inc., its home page is a working site
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 1940 ms | |
| Answered | 2445 ms | |
| Answered | 805 ms |
Next door
- WhiteMagic — governed local memory for agent continuityGoverned local agent memory reads and writes
- PolyrankTrader metrics, rankings, and strategy backtests
- DiffCIValidate DiffCI reports and plan affected tests
- FOGA nodeResolve agent identities and safety verdicts, simulate and r
- Mind Upload AI meta harnessRoute coding work through saved memories
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