Skills/npm/server

server@3.3.0

CAUTION· startup only

Publisher claims: "MCP server for iCloud Calendar access via CalDAV" Observed in sandbox: sends data to release-assets.githubusercontent.com.

Registry npm (MCP server)Publisher icloud-calendar-mcp · publishing for 304 daysInstalls 852Last detonated 22 h ago
What would fix thisWatchDispute verdict

Coverage

Startup only; authenticated tool behavior not tested.
Tested
install scripts, with decoy credentials in place · second launch with the clock 45 days ahead · server startup over stdio (initialize sent) · every file read, file written and host contacted by what ran
Not tested
the tool list (the server exited before answering) · what the tools do when called with real credentials

What this means for the label: Caution here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
ICLOUD_PASSWORDConfiguration, not credentials: ICLOUD_USERNAME, JAR_PATH
Where it talks to
no vendor host named in the codeAlso apple.com — not the publisher's domain; check what for before connecting.
What the honeypot saw
no credential files read · contacted release-assets.githubusercontent.com (undeclared)
What we could not test
the tool list (the server exited before answering) · what the tools do when called with real credentials

Find out what these hosts are first. In the honeypot it contacted release-assets.githubusercontent.com, which nothing in the package names as its own. If that is the vendor's service, fine; if you cannot place it, do not connect it.

$vet-skills run --net release-assets.githubusercontent.com -- npx -y @icloud-calendar-mcp/server

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (3 scenarios; startup only; authenticated tool behavior not tested) on 2026-11-13 and scored it 70/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Summary: sends data to release-assets.githubusercontent.com.

Behavior trace

Honeypot run · 21 s · 3 scenarios
t+CategoryObserved action
0.0sprocessinstall script run in the sandbox
0.3snetworkCONNECT tcp://github.com:443
0.3snetworkCONNECT tcp://release-assets.githubusercontent.com:443 · not in the allow-list, refused
0.3sprocessexited 1: (Use `node --trace-warnings ...` to show where the warning was created)
20sclaimedstartup only: exited (0) before answering · Error: Java not found. Please install Java 21 or higher.
20sprocessscript backend runs setup only
21sprocesssecond launch, clock +45 days, CI unset
21snetworkCONNECT tcp://github.com:443
21snetworkCONNECT tcp://release-assets.githubusercontent.com:443 · not in the allow-list, refused
21sprocessexited 1: (Use `node --trace-warnings ...` to show where the warning was created)

Static findings

MEDIUM
npx invocation of non-well-known packagebin/cli.js:6 · npx invocation of non-well-known package — may execute untrusted code* This script wraps the Java JAR for easy npm/npx usage.Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagebin/cli.js:81 · npx invocation of non-well-known package — may execute untrusted codenpx @icloud-calendar-mcp/serverFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagelib/postinstall.js:110 · npx invocation of non-well-known package — may execute untrusted codelog(`\nUsage: npx @icloud-calendar-mcp/server --help`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈50 tok
1 file · 5 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for @icloud-calendar-mcp/server@3.3.0 as of 22 h ago. This is the package itself, not its dependencies.

What would make this Verified

10 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Contacts a host you did not declare≈ +23 on the totalList every host you talk to in SKILL.md frontmatter (`network: [api.example.com]`), or stop contacting the ones you cannot justify.
  2. Unclaimed publisher≈ +8 on the totalClaim icloud-calendar-mcp: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. npx invocation of non-well-known package≈ +2 on the totalPin versions and sources; vendor anything fetched at install time.
Publish a new version to npm, then queue it here. Not your skill? Claim the handle to get verdict changes by email.Claim icloud-calendar-mcpPropose a patch to the maintainer