mcp@3.0.0

VERIFIED

Publisher claims: "MCP (Model Context Protocol) server for Claude integration with MailDev" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher maildev · joined 0 days agoInstalls 19,740Last detonated 2 h ago
$claude mcp add mcp -- npx -y @maildev/mcp
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Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-10-26 and scored it 93/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 1 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.6sprocessdependency install exit 1
0.7sprocessexec /usr/bin/timeout
0.7sprocessexited 1: Node.js v22.23.4
0.7sclaimedno tools/list reply (exit 1)
0.7sprocessscript backend runs setup only

Static findings

CRITICAL
Prompt injectionpackage.json:27 · Prompt injection — known jailbreak technique referenceFix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST01

No other findings across 1,260 lines in 16 files.

mcp@3.0.0 safety verdict: Verified 93/100 — KillerSkills