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Head to head

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

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

MCPcom.decionis/mcp
A
No reviews yet

Authorize consequential AI agent actions before execution

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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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The short version

Neither has been reviewed yet, so the comparison rests on the scan and the public usage numbers. The safety scan favours MCP (99/100 against 79). MCP has noticeably more public adoption.

 MCPONCE — Exactly-Once Reliability for AI Agent Actions
User ratingNo reviews yetNo reviews yet
Safety gradeA99/100B79/100
AdoptionEstablishedGrowing
GitHub stars5330
Downloads / week297–
Runs whereHosted (remote)Hosted (remote)
Gateway-readyYesYes
Tools—2
Write actions—1
Price per callFreeFree
LicenceApache-2.0—
Last release2026-09-192026-09-13
CategoryAI and agentsAI and agents

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