calculate_ck_metrics

THE RISK

Low Risk

Why calculate_ck_metrics needs a policy

The calculate_ck_metrics tool performs a read-only static analysis operation on code to extract well-known software metrics. It queries the codebase structure to compute complexity measurements but does not create, modify, execute, or delete any data. This is a classic Read operation: information retrieval with no side effects.

From the tool's definition Tool name contains 'calculate' and description indicates it computes metrics (WMC, DIT, NOC, CBO, RFC, LCOM) for a class.

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

POLICY

How to control calculate_ck_metrics

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

policy.json

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

calculate_ck_metrics 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 CodeRAG — 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 calculate_ck_metrics

What does the calculate_ck_metrics tool do? +

Calculate Chidamber & Kemerer metrics for a class (WMC, DIT, NOC, CBO, RFC, LCOM). It is categorised as a Read tool in the CodeRAG MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on calculate_ck_metrics? +

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

What risk level is calculate_ck_metrics? +

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

Can I rate-limit calculate_ck_metrics? +

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

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

calculate_ck_metrics is provided by the CodeRAG MCP server (jonnoc/coderag). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CodeRAG tool call.

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

CHECK YOUR STACK →