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Head to head

ONCE — Exactly-Once Reliability for AI Agent Actions vs Protect

Same numbers we show everywhere else, lined up. Ratings come from users, the grade comes from our scanner, adoption comes from public registries.

ONCE — Exactly-Once Reliability for AI Agent Actionsio.github.GSterlingPress/once
B
No reviews yet

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

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Protectcom.scopeblind/protect-mcp
C
No reviews yet

Fail-closed Cedar policy gate + Ed25519 signed receipts for agent tool calls. Denies on any error.

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The short version

Neither has been reviewed yet, so the comparison rests on the scan and the public usage numbers. The safety scan favours ONCE — Exactly-Once Reliability for AI Agent Actions (79/100 against 65). ONCE — Exactly-Once Reliability for AI Agent Actions is hosted and callable through the gateway; Protect runs on your own machine. Protect has noticeably more public adoption.

 ONCE — Exactly-Once Reliability for AI Agent ActionsProtect
User ratingNo reviews yetNo reviews yet
Safety gradeB79/100C65/100
AdoptionGrowingGrowing
GitHub stars09
Downloads / week–1.6k
Runs whereHosted (remote)Your machine (local)
Gateway-readyYesNo
Tools212
Write actions15
Price per callFreeFree
Licence—MIT
Last release2026-09-132026-09-17
CategoryAI and agentsAI and agents

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