health_check

THE RISK

Low Risk

Why health_check needs a policy

This tool queries the operational state of the server and its components, returning diagnostic information. It performs no modifications, deletions, code execution, or financial operations. It is a passive monitoring/diagnostic tool typical of production systems. Categorized as Read with low severity since misuse poses minimal risk—an agent cannot cause harm by repeatedly checking health status.

From the tool's definition Tool name 'health_check' and description 'Check MCP server health and component status' indicate retrieval of status information with no side effects.

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

POLICY

How to control health_check

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

policy.json

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

health_check 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 A-Modular-Kingdom — 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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All 14 A-Modular-Kingdom tools →

Read tools on other servers

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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 health_check

What does the health_check tool do? +

Check MCP server health and component status. It is categorised as a Read tool in the A-Modular-Kingdom MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on health_check? +

Register the A-Modular-Kingdom MCP server in PolicyLayer and add a rule for health_check: 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 A-Modular-Kingdom. Nothing to install.

What risk level is health_check? +

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

Can I rate-limit health_check? +

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

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

health_check is provided by the A-Modular-Kingdom MCP server (masihmoafi/a-modular-kingdom). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every A-Modular-Kingdom tool call.

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

CHECK YOUR STACK →