Calliope MCP Server

Item: Calliope MCP Server
Rating: 74
Author: M8ven

Provides MCP tools to read, write, append, and edit prose sections of nodes, backed by an in-memory or substrate-direct (Urania) backend.

→ robfischer1/calliope · listed on glama

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// key findings

🚨

Known vulnerabilities in dependencies: 2 critical

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

// known CVEs in dependencies2 critical

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

criticalvitest@2.1.8GHSA-5xrq-8626-4rwp

When Vitest UI server is listening, arbitrary file can be read and executed

criticalvitest@2.1.8GHSA-9crc-q9x8-hgqq

Vitest allows Remote Code Execution when accessing a malicious website while Vitest API server is listening

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// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configCALLIOPE_MCP_BACKEND

configCALLIOPE_URANIA_WIRED— live transport is deferred, guarded behind and an

configHOST

configURANIA_URL— (UraniaBodyClient live by default — , internal-net

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 5 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/robfischer1-calliope-2lb7rk)](https://m8ven.ai/mcp/robfischer1-calliope-2lb7rk)

commit: dcfde812126db0789e315c148de0d2566c414b29

code hash: 35cb7f09bd926b04b15137cc2724e32dea3fea1dc194f6d6f706d5236b9f2f8d

verified: 6/19/2026, 10:52:18 AM

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