Skills/PyPI/mcpguard

mcpguard@0.1.0

CAUTION· not started

Publisher claims: "Security scanner and runtime protection for MCP (Model Context Protocol) servers" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher aryanjp1 · publishing for 280 daysInstalls 14Last detonated 4d ago
What would fix thisWatchDispute verdict

Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

What this means for the label: Caution here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
no vendor host named in the codeAlso owasp.org, nist.gov, oasis-open.org, githubusercontent.com — not the publisher's domain; check what for before connecting.
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Connect it under the guard. Not started: dependency install failed; the server itself was not observed. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- uvx mcpguard

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; not started: dependency install failed; the server itself was not observed) on 2026-11-11 and scored it 76/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Access to sensitive file paths; Access to sensitive file paths; Access to sensitive file paths. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.1sprocessscript backend runs setup only
0.1sprocessno install scripts to re-run

Static findings

HIGH
Access to sensitive file pathssrc/mcpshield/cli.py:284 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files- "~/.aws/**"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcpshield/cli.py:283 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files- "~/.ssh/**"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcpshield/cli.py:285 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files- "~/.gnupg/**"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/supply_chain.py:169 · npx invocation of non-well-known package — may execute untrusted code"""Detect use of npx -y for automatic package installation without verification.Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathssrc/mcpshield/utils/patterns.py:94 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"~/.ssh",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/excessive_permissions.py:167 · npx invocation of non-well-known package — may execute untrusted code# Skip package names in npx invocationsFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST06
MEDIUM
Destructive command against a filesystem root or devicetests/test_utils.py:118 · Destructive command against a filesystem root or deviceresult = detect_shell_injection("arg; rm -rf /")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
References a credential file in the home directorysrc/mcpshield/utils/patterns.py:99 · References a credential file in the home directory"~/.npmrc",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST03
MEDIUM
Access to sensitive file pathstests/test_runtime_guard.py:64 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesawait guard.check("read_file", {"path": "/etc/passwd"})Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Access to sensitive file pathstests/test_utils.py:123 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesresult = detect_shell_injection("data | cat /etc/passwd")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Access to sensitive file pathstests/test_policy.py:71 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesallowed, reason = policy.check_path_allowed("read_file", "/etc/passwd")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcpshield/utils/patterns.py:98 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"~/.netrc",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/supply_chain.py:5 · npx invocation of non-well-known package — may execute untrusted codeMCPS-003: Unverified NPX Package ExecutionFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
URL to the cloud instance metadata addresstests/test_runtime_guard.py:75 · URL to the cloud instance metadata address — reads the VM's credentialsawait guard.check("http_request", {"url": "http://169.254.169.254/latest/meta-data/"})Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/supply_chain.py:6 · npx invocation of non-well-known package — may execute untrusted codeDetects use of npx -y which auto-installs and runs npm packagesFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
GitHub token pattern detectedtests/test_scanner_engine.py:68 · GitHub token pattern detected — possible hardcoded or harvested token"env": {"GITHUB_TOKEN": "ghp_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghij"}Fix: Never read or enumerate credential locations; accept a documented environment variable instead.
AST03
HIGH
Access to sensitive file pathssrc/mcpshield/utils/patterns.py:95 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"~/.aws",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
GitHub token pattern detectedtests/test_utils.py:61 · GitHub token pattern detected — possible hardcoded or harvested tokenhits = scan_for_secrets("ghp_ABCDEFGHIJKLMNOPQRSTUVWXYZabcd12345678")Fix: Never read or enumerate credential locations; accept a documented environment variable instead.
AST03
HIGH
Access to sensitive file pathssrc/mcpshield/utils/patterns.py:102 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"/etc/passwd",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Destructive file system command detectedtests/test_utils.py:118 · Destructive file system command detectedresult = detect_shell_injection("arg; rm -rf /")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
References a credential file in the home directorysrc/mcpshield/utils/patterns.py:98 · References a credential file in the home directory"~/.netrc",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST03
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/supply_chain.py:64 · npx invocation of non-well-known package — may execute untrusted code"""Check if npx arguments include the auto-install yes flag.Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagesrc/mcpshield/scanner/rules/supply_chain.py:35 · npx invocation of non-well-known package — may execute untrusted code"""Extract the npm package name from npx command arguments.Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathssrc/mcpshield/runtime/policy.py:202 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesblocked_paths=["~/.ssh/**", "~/.aws/**", "~/.gnupg/**", "/etc/**"]Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Access to sensitive file pathstests/test_runtime_guard.py:28 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"blocked_paths": ["~/.ssh/**"],Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcpshield/utils/patterns.py:96 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"~/.gnupg",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05

Cost to the agent

Instructions loaded
≈54 tok
1 file · 51 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 mcpguard@0.1.0 as of 4d ago. This is the package itself, not its dependencies.

What would make this Verified

4 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim aryanjp1: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  3. References a credential file in the home directory≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  4. npx invocation of non-well-known package≈ +2 on the totalPin versions and sources; vendor anything fetched at install time.
  5. Destructive command against a filesystem root or device≈ +2 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  6. URL to the cloud instance metadata address≈ +2 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
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