Mmcp.market

Is ONCE — Exactly-Once Reliability for AI Agent Actions MCP server safe?

Yes, with the usual care.

B79/100grade B

Safe to use. Minor gaps such as a missing repository or slower maintenance.

What to know before installing
  • highWrite-action tools reachable without authentication

Public scan report

scanner v0.1.5 · 2026-09-19 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 291ms20/20
  • Tool poisoning2 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 6 days ago15/15
  • Maintainer identityregistry namespace matches repository owner6/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 79/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Other servers that do what ONCE — Exactly-Once Reliability for AI Agent Actions does

  • Agent-Native Chat
    Minimal chat-first app with durable threads, actions, and the app-agent loop
    A
  • MCP
    Authorize consequential AI agent actions before execution
    A
  • Ausca
    Pay-per-call APIs and MCP services for agents, no accounts or keys, with verifiable receipts.
    B

ONCE — Exactly-Once Reliability for AI Agent Actions reviews, tools and install