list_db_query_stats

ServerMackerel MCP Server
CategoryRead

WHAT IT DOES

What list_db_query_stats does on Mackerel MCP Server

AI agents call list_db_query_stats to retrieve information from Mackerel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_db_query_stats needs a policy

This tool retrieves and inspects monitoring data from the Mackerel platform without creating, modifying, deleting, or executing operations. It is purely informational—analyzing query statistics, identifying patterns, and investigating performance are all read operations with no side effects or blast radius.

From the tool's definition Tool description states 'Retrieve database query statistics' with use cases of analyzing, identifying, and monitoring (analyze, identify, investigate, monitor) — all read-only operations. No modification, deletion, or execution capability mentioned.

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

POLICY

How to control list_db_query_stats

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

policy.json

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

list_db_query_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 Mackerel MCP Server — 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 list_db_query_stats

What does the list_db_query_stats tool do? +

Retrieve database query statistics from Mackerel. 🔍 USE THIS TOOL WHEN USERS: - Analyze slow database queries - Identify high-frequency queries - Investigate database performance issues - Monitor query execution patterns <examples> Get DB stats \. It is categorised as a Read tool in the Mackerel MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_db_query_stats? +

Register the Mackerel MCP Server MCP server in PolicyLayer and add a rule for list_db_query_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 Mackerel MCP Server. Nothing to install.

What risk level is list_db_query_stats? +

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

Can I rate-limit list_db_query_stats? +

Yes. Add a rate_limit block to the list_db_query_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 list_db_query_stats completely? +

Set action: deny in the PolicyLayer policy for list_db_query_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 list_db_query_stats? +

list_db_query_stats is provided by the Mackerel MCP Server MCP server (mackerelio-labs/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mackerel MCP Server tool call.

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

CHECK YOUR STACK →

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16 Mackerel MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.