cache_stats

THE RISK

Low Risk

Why cache_stats needs a policy

This tool performs a read-only query operation to retrieve cache performance metrics. It returns observational data (hit rate, size, entry count) without creating, modifying, deleting, or executing anything. The absence of verbs like 'set', 'clear', 'flush', or 'reset' confirms it is purely informational.

From the tool's definition Tool description states 'Get cache statistics' - a retrieval operation that 'monitor[s] cache performance' with no modification or side effects.

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

POLICY

How to control cache_stats

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

policy.json

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

cache_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 Kawaiidra MCP — 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

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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 cache_stats

What does the cache_stats tool do? +

Get cache statistics including hit rate, size, and entry count. Use this to monitor cache performance. It is categorised as a Read tool in the Kawaiidra MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on cache_stats? +

Register the Kawaiidra MCP server in PolicyLayer and add a rule for cache_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 Kawaiidra MCP. Nothing to install.

What risk level is cache_stats? +

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

Can I rate-limit cache_stats? +

Yes. Add a rate_limit block to the cache_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 cache_stats completely? +

Set action: deny in the PolicyLayer policy for cache_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 cache_stats? +

cache_stats is provided by the Kawaiidra MCP server (wagonbomb/kawaiidra-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Kawaiidra MCP tool call.

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

CHECK YOUR STACK →