explain_rule

THE RISK

Low Risk

Why explain_rule needs a policy

This tool retrieves and presents documentation about Magento coding standards. It is purely informational—it reads rule definitions and returns explanatory content without modifying any data, executing code, or triggering side effects.

From the tool's definition Tool provides 'detailed explanation' and 'examples' of coding standards rules; performs information retrieval with no data modification, deletion, or code execution capabilities.

Documented attack patterns abuse exactly the kind of access explain_rule gives an agent:

POLICY

How to control explain_rule

PolicyLayer is an MCP gateway — it sits between your AI agents and Magento 2 Coding Standards MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for explain_rule:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "explain_rule": {}
  }
}

explain_rule is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Magento 2 Coding Standards MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Magento 2 Coding Standards MCP Server tools

Write manage_theme Manage theme-specific coding standards. Themes layer additional rules on top of base Magen Read check_security Perform security-focused validation on code. Checks for XSS vulnerabilities, SQL injection Read get_magento_pattern Get the correct Magento 2 way to accomplish a task. Returns the proper pattern, code examp Read get_rules_summary Get a summary of all Magento coding standard rules grouped by category, showing counts of Read list_rules List all Magento coding standard rules. Can filter by category (Security, Legacy, PHP, Fun Read validate_code Validate code against Magento 2 coding standards. Returns violations with severity, line n

All 7 Magento 2 Coding Standards MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about explain_rule

What does the explain_rule tool do? +

Get detailed explanation of a Magento coding standard rule including reasoning, bad/good examples, and fix suggestions. It is categorised as a Read tool in the Magento 2 Coding Standards MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on explain_rule? +

Register the Magento 2 Coding Standards MCP Server MCP server in PolicyLayer and add a rule for explain_rule: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Magento 2 Coding Standards MCP Server. Nothing to install.

What risk level is explain_rule? +

explain_rule is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit explain_rule? +

Yes. Add a rate_limit block to the explain_rule rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block explain_rule completely? +

Set action: deny in the PolicyLayer policy for explain_rule. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides explain_rule? +

explain_rule is provided by the Magento 2 Coding Standards MCP Server MCP server (midhun-edv/magento-coding-standard-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Magento 2 Coding Standards MCP Server tool call.

Start from Magento 2 Coding Standards MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →