adguard_stats

THE RISK

Low Risk

Why adguard_stats needs a policy

This tool retrieves and queries statistical data from AdGuard with no side effects. It performs passive data retrieval operations (queries, counts, top lists) within a time window. There is no capability to modify settings, execute commands, delete data, or perform financial transactions. The default 24h window is a read-only parameter. This is a straightforward Read category tool with minimal risk.

From the tool's definition Tool description states 'Query stats' and lists only retrieval operations: 'queries, blocked counts, top clients, top domains, top blocked domains'. No modification, deletion, execution, or financial operations are mentioned.

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

POLICY

How to control adguard_stats

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for adguard_stats:

policy.json

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

adguard_stats 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 Crow — 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

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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 adguard_stats

What does the adguard_stats tool do? +

Query stats: queries, blocked counts, top clients, top domains, top blocked domains (defaults to last 24h window). It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on adguard_stats? +

Register the Crow MCP server in PolicyLayer and add a rule for adguard_stats: 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 Crow. Nothing to install.

What risk level is adguard_stats? +

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

Can I rate-limit adguard_stats? +

Yes. Add a rate_limit block to the adguard_stats 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 adguard_stats completely? +

Set action: deny in the PolicyLayer policy for adguard_stats. 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 adguard_stats? +

adguard_stats is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →