Skills/npm/mcp-mailtrap

mcp-mailtrap@0.12.0

VERIFIED

Publisher claims: "Official MCP Server for Mailtrap" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher mailtrap · joined 10 days agoInstalls 2,706Last detonated 2 h ago
$claude mcp add mcp-mailtrap -- npx -y mcp-mailtrap
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Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-11-05 and scored it 84/100 (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
1.2sprocessdependency install exit 1
1.3sprocessexec /usr/bin/date
1.3sprocessexec /usr/bin/timeout
1.3sclaimedno tools/list reply (exit 0)
1.3sprocessscript backend runs setup only

Static findings

LOW
Authorization escalation languageREADME.md:1203 · Authorization escalation language · informational: not an instruction fileFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
File permission modification commandpackage.json:27 · File permission modification command — agent changes file ownership/permissionsFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05

Cost to the agent

Instructions loaded
≈44 tok
1 file · 81 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 mcp-mailtrap@0.12.0 as of 1 h ago. This is the package itself, not its dependencies.