mcp-modelcontextprotocol@0.3.31
VERIFIEDPublisher claims: "Atomic Mail MCP server — local stdio proxy with PoW auth and JMAP, for AI agents. (modelcontextprotocol install channel)" Observed in sandbox: no network, touches nothing outside the project, writes no memory.
Registry npm (MCP server)Publisher atomicmail · joined 2 days agoInstalls 4,471Last detonated 47 h ago
$claude mcp add mcp-modelcontextprotocol -- npx -y @atomicmail/mcp-modelcontextprotocol
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KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-10-28 and scored it 80/100 (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 deviationst+CategoryObserved action
0.0sprocessno install scripts in bundle
0.7sprocessdependency install exit 1
0.8sprocessexec /usr/bin/timeout
0.8sprocessexited 1: Node.js v22.23.4
0.8sclaimedno tools/list reply (exit 1)
0.8sprocessscript backend runs setup only
Static findings
CRITICAL
Fake instruction boundary tagshared/help/topics/cron.md:44 · Fake instruction boundary tagFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01CRITICAL
Fake instruction boundary tagshared/help/topics/cron.md:45 · Fake instruction boundary tagFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01CRITICAL
Fake instruction boundary tagshared/help/topics/cron.md:50 · Fake instruction boundary tagFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01HIGH
Credential pass-through configurationshared/messages/errors.json:47 · Credential pass-through configuration — agent relays sensitive credentialsFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST02MEDIUM
File type combined with upload actionesm/lib/agent/jmap/agent-jmap-run.d.ts:4 · File type combined with upload action — agent may exfiltrate local data filesFix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07CRITICAL
Fake instruction boundary tagshared/help/topics/cron.md:43 · Fake instruction boundary tagFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01MEDIUM
File type combined with upload actionesm/lib/agent/jmap/agent-jmap.d.ts:6 · File type combined with upload action — agent may exfiltrate local data filesFix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07MEDIUM
File type combined with upload actionshared/skill/manifest.json:34 · File type combined with upload action — agent may exfiltrate local data filesFix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07MEDIUM
npx invocation of non-well-known packageshared/skill/manifest.json:12 · npx invocation of non-well-known package — may execute untrusted codeFix: Pin versions and sources; vendor anything fetched at install time.
AST06