netdata_query

THE RISK

Low Risk

Why netdata_query needs a policy

Querying a chart is a read-only operation that retrieves monitoring or metrics data without causing side effects, modifying state, executing code, or deleting anything. Even if misused by an AI agent, the worst outcome would be information disclosure about system metrics, which has minimal blast radius.

From the tool's definition Tool description states "Query a single chart" - this is a retrieval/querying operation with no modification or execution capabilities. The verb "query" combined with read-only access to chart data indicates data retrieval only.

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

POLICY

How to control netdata_query

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 netdata_query:

policy.json

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

netdata_query 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 netdata_query

What does the netdata_query tool do? +

Query a single chart. 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 netdata_query? +

Register the Crow MCP server in PolicyLayer and add a rule for netdata_query: 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 netdata_query? +

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

Can I rate-limit netdata_query? +

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

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

netdata_query 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 →