Is rules-mcp safe to use?

rules-mcp scores 16/100 (grade F) on the Canopii Trust Index, and carries 1 confirmed security failure that caps its score: No command-injection sinks. It passes 12 of the 24 controls that apply to it.

What security issues does rules-mcp have?

rules-mcp fails 1 control: No command-injection sinks. Each failure on this page carries the evidence behind it — the file and line, dependency, or CVE that decided it.

How reliable is the security score for rules-mcp?

We could evaluate 89% of the controls that apply to rules-mcp. Scores are deterministic — the same source always produces the same score — and a partially-scannable server cannot present a high one, because confidence caps the result. The scanner is open source, so this score can be reproduced independently.

How was rules-mcp scored?

Its published source was scanned against a fixed catalog of weighted security controls covering code safety, committed secrets, dependency vulnerabilities, tool-description integrity, authentication and transport, and maintenance. A confirmed flaw caps the score outright regardless of what else passes. The full rubric is published.

rules-mcp MCP Server Security Report

io.github.AKR1166/rules-mcp

MCP for rules/skills/knowledge evaluation for Cursor, Claude, VS Code, and Antigravity.

16F

Security Trust Score

Grade F · Serious issues

Tier 1 · Public sourceHigh confidence · 89%latest v0.3.1 Repository

Declared MCP capabilities

Prompts

Run it securely

This server scored F. Run it behind runtime policy enforcement so one bad tool call can't become an incident.

Are you the maintainer?

Verify with GitHub to get alerted whenever AKR1166/Rules-MCP changes score — and claim the badge for your README.

Claim this server

1 issue capping this score

criticalNo command-injection sinks — 1 occurrence

The short answer

Is rules-mcp safe to use?: rules-mcp scores 16/100 (grade F) on the Canopii Trust Index, and carries 1 confirmed security failure that caps its score: No command-injection sinks. It passes 12 of the 24 controls that apply to it.
What security issues does rules-mcp have?: rules-mcp fails 1 control: No command-injection sinks. Each failure on this page carries the evidence behind it — the file and line, dependency, or CVE that decided it.
How reliable is the security score for rules-mcp?: We could evaluate 89% of the controls that apply to rules-mcp. Scores are deterministic — the same source always produces the same score — and a partially-scannable server cannot present a high one, because confidence caps the result. The scanner is open source, so this score can be reproduced independently.
How was rules-mcp scored?: Its published source was scanned against a fixed catalog of weighted security controls covering code safety, committed secrets, dependency vulnerabilities, tool-description integrity, authentication and transport, and maintenance. A confirmed flaw caps the score outright regardless of what else passes. The full rubric is published.

Security controlslatest scored version v0.3.1

Each control is evaluated deterministically with evidence. The score is earned from passing controls; a failed guard caps it.

Model–MCP Runtime Guardrails

Warn
Strict JSON Schema Enforcementschemas not strict
Tool inputs are constrained (additionalProperties:false), so unexpected arguments can't be smuggled in.
Fix: Set additionalProperties:false and require explicit parameters on every tool.
Pass
Indirect Prompt Injection (IPI) Defensesguardno injection markers
Tool/prompt/resource text is free of hidden instructions that could hijack the agent.
Pass
User-in-the-Loop / Approval Scopeguardno destructive tool scope
No over-broad or destructive tools (arbitrary shell, bulk-delete) that warrant human approval.
N/A
Tool Definition Integrityguardno prior version to diff
Every consecutive version pair is diffed for new injection markers or destructive scope — a risky diff anywhere in history is a rug-pull (fail, durable); benign description drift warns.

Application Security Checks

Fail
No command-injection sinksguard1 occurrence
Untrusted tool input reaching a shell yields remote code execution. How many servers fail this?
cursor skills/typescript-expert/scripts/ts_diagnostic.py:16
Fix: Never pass tool arguments to a shell; use argv arrays with shell disabled.
Warn
No path traversalguard3 occurrences
Naive path checks let tools read/write outside intended directories (EscapeRoute-class).
cursor skills/nestjs-best-practices/scripts/build-agents.ts:89cursor skills/nestjs-best-practices/scripts/build-agents.ts:107cursor skills/nestjs-best-practices/scripts/build-agents.ts:122
Fix: Resolve to a canonical path and verify containment; reject ../ and symlinks.
Warn
Published with provenanceno provenance attestation
Build provenance attests the artifact was built from the claimed source by CI.
Fix: Publish with npm provenance (--provenance) from a trusted CI.
Warn
Established maintainersingle maintainer
Brand-new / single anonymous maintainers raise takeover and malware risk.
Fix: Publish under an established account/org; add multiple maintainers.
Warn
Has a security policyno security policy
A SECURITY.md gives a private path to report vulnerabilities.
Fix: Add SECURITY.md with a disclosure contact and process.
Pass
No dynamic code executionguardno sinks found
eval()/exec()/Function() on tool-derived strings allows arbitrary code execution.
Pass
No SSRF sinksguardno sinks found
Fetching tool-supplied URLs can pivot into internal networks and metadata services.
Pass
No unsafe deserializationguardno sinks found
pickle/yaml.load/etc. on untrusted data can execute code.
Pass
No committed secretsguardno secrets found
Hardcoded keys/tokens in published source are live credentials an attacker can use.
Pass
Credentials sourced from environmentreads credentials from environment
Reading secrets from env/secret stores avoids hardcoding them.
Pass
No known-vulnerable dependencies1 runtime deps, no known CVEs
Runtime dependencies (parsed from the lockfile) are scanned against OSV.dev for published CVEs. Advisory: flagged dependencies lower the score but don't hard-cap it, since transitive reachability is unproven.
Pass
Dependencies pinned (lockfile)lockfile present
A lockfile makes installs reproducible and resistant to silent dependency swaps.
Pass
No install/post-install scriptsguardno install scripts
install hooks run arbitrary code on every consumer at install time.
Pass
Package name not typosquattingguarddistinct package name
Names mimicking popular packages are a common malware delivery vector.
Not checked
Actively maintainedGitHub API unavailable
Unmaintained servers don't receive security fixes.
Not checked
Repository not archivedguardGitHub API unavailable
Archived repositories will never be patched.
Not checked
Declares a licenseGitHub API unavailable
A clear license is required for legal enterprise use.
Not checked
Signed releasesnot evaluated
Signed releases let consumers verify artifacts weren't tampered with.
Not checked
Adoption & popularityno adoption signal
A small, capped nudge from stars/downloads — widely-used servers get more eyes on bugs. It can never offset a real security failure.

Transport & Trust Model

Warn
Execution Sandboxingruns natively (no container image)
A container/sandbox image limits blast radius; a server that runs natively has full host access.
Fix: Ship a Dockerfile/Containerfile (or document a sandboxed run) so the server runs isolated.
Pass
Network Exposureno bind-all detected
Binding 0.0.0.0 or exposing debug inspectors widens the attack surface.
N/A
Transport Encryption (TLS)guardno remote endpoints
Plaintext HTTP exposes traffic and bearer tokens to interception.
N/A
IAM / Authentication Scopingno remote endpoints
OAuth 2.1 / Protected Resource Metadata gates who can invoke tools.
N/A
Live Endpoint Reachablenot dynamically scanned
A dynamic scan connected to the declared remote endpoint and it responded — verified live, not a dead URL.
N/A
Authentication Enforced (live)not dynamically scanned
If the server declares auth is required, it must actually reject anonymous clients. Serving tools to unauthenticated callers is a real exposure.

Embed this score

Add the live badge to your README — it updates automatically on every rescan.

markdown

[![Canopii Trust Score](https://index.canopii.dev/api/badge/io.github.AKR1166/rules-mcp)](https://index.canopii.dev/server/io.github.AKR1166/rules-mcp)

html

<a href="https://index.canopii.dev/server/io.github.AKR1166/rules-mcp"><img src="https://index.canopii.dev/api/badge/io.github.AKR1166/rules-mcp" alt="Canopii Trust Score" /></a>

Versions

Version	Score	Status	Published
v0.3.1latest	16F	scored	8/11/2026

Wondering how this compares? The MCP Security Index tracks grade distribution, committed secrets, and missing authentication across the whole ecosystem, refreshed monthly.