Is Siren MCP server safe?
Yes, with the usual care.
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 1090ms20/20
- Tool poisoning36 tool descriptions checked15/15
- Auth qualityopen endpoint exposes 17 write-action tools with no auth3/15
- Maintenancelast push 7 days ago15/15
- Maintainer identitynamespace and repository owner differ4/10
Findings (1)
- highWrite-action tools reachable without authentication
auth.open-write
Overall 76/100. 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 Siren does
- Agent-Native PlanStructured visual plans and PR recaps with diagrams, prototypes, annotations, and sharingnot reviewedEstablishedA
- DvalincodeDeterministic security scanning, no model or API key, plus offline-verifiable proof a fix worked.not reviewedGrowingA
- adrkit decision memoryDeterministic, offline, read-only ADR decision memory for coding agents. No model or network calls.not reviewedGrowingA