io.github.GSterlingPress/once

repo:https://github.com/gsterlingpress/once-api

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

transport:: remote
credential class:: self-provisionable
repo:: https://github.com/GSterlingPress/once-api

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Tools

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.
shallow
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, and suppresses verified retries.
shallow

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