Skills/npm/verify-mcp

verify-mcp@0.1.0

VERIFIED

Publisher claims: "Free, no-account verification of KeyHalve-sealed documents. Read-only; never receives keys." Observed in sandbox: calls mcp.keyhalve.com only, touches nothing outside the project, writes no memory.

Registry npm (MCP server) · listed in the official MCP RegistryPublisher keyhalve · publishing for 104 daysInstalls 0Last detonated 4d ago
$claude mcp add verify-mcp -- npx -y @keyhalve/verify-mcp
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Coverage

Server started and answered tools/list.
Tested
MCP initialize and tools/list · every tool description, for hidden instructions · every file read, file written and host contacted by what ran
Not tested
what the tools do when called with real credentials

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
keyhalve.com (its own)
What the honeypot saw
no credential files read · reached only mcp.keyhalve.com (its own)
What we could not test
what the tools do when called with real credentials

Reasonable to connect. No credential asked for, no third-party host named, Server started and answered tools/list.

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 (2 scenarios) on 2026-11-10 and scored it 92/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: calls mcp.keyhalve.com only, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 22 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
1.5sprocessdependency install exit 0
21snetworkCONNECT tcp://mcp.keyhalve.com:443
21snetworkCONNECT tcp://mcp.keyhalve.com:443
21snetworkCONNECT tcp://mcp.keyhalve.com:443
21snetworkCONNECT tcp://mcp.keyhalve.com:443
21sclaimed3 tools: keyhalve_verify, keyhalve_status, keyhalve_explain
21sprocessscript backend runs setup only
21sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagebin/keyhalve-verify-mcp.mjs:9 · npx invocation of non-well-known package — may execute untrusted code* clients (`npx @keyhalve/verify-mcp`) get byte-identical behavior to theFix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Authorization escalation languageREADME.md:71 · Authorization escalation language · informational: not an instruction fileSettings → Connectors → Advanced → Developer mode → Add server →Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
LOW
Authorization escalation languageREADME.md:70 · Authorization escalation language · informational: not an instruction file### ChatGPT (Developer mode — Plus/Pro/Business/Enterprise/Edu)Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
LOW
Prompt injectionREADME.md:71 · Prompt injection — known jailbreak technique reference · informational: not an instruction fileSettings → Connectors → Advanced → Developer mode → Add server →Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST01
LOW
Prompt injectionREADME.md:70 · Prompt injection — known jailbreak technique reference · informational: not an instruction file### ChatGPT (Developer mode — Plus/Pro/Business/Enterprise/Edu)Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST01

Cost to the agent

Instructions loaded
≈85 tok
1 file · 9 in bundle
Tool list per prompt
≈416 tok
3 tools · 139 per tool
Handshake
255 ms
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 324

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 @keyhalve/verify-mcp@0.1.0 as of 4d ago. This is the package itself, not its dependencies.