postals-mcp@1.1.0
VERIFIEDPublisher claims: "Postals — the agent skill that turns any AI into a direct mail machine. One MCP tool call mails a physical handwritten postcard (real pen-and-ink, USPS 3-5 day delivery, $4.99 per card). Works with Claude Desktop, Cursor, Claude Code, OpenClaw, n8n, LangC" Observed in sandbox: no network, touches nothing outside the project, writes no memory.
Registry npm (MCP server)Publisher coopergwrenn · joined 5 days agoInstalls 144Last detonated 5d ago
Is [email protected] safe to install?
KillerSkills ran it in the KillerSkills honeypot sandbox (1 scenario) on 2026-10-29 and scored it 90/100 (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 · 0 s · 1 scenarios · 0 deviationst+CategoryObserved action
0.0sprocessno install scripts in bundle
0.0sprocessscript backend runs setup only
0.0sprocessscript backend runs setup only
Static findings
MEDIUM
File type combined with upload actionSKILL.md:255 · 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
Context shift attemptSKILL.md:270 · Context shift attempt — trying to change operational modeFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01MEDIUM
File permission modification commandpackage.json:12 · File permission modification command — agent changes file ownership/permissionsFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05HIGH
Financial transfer languageREADME.md:691 · Financial transfer language — potential advance-fee scamFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01