bookstack_get_metrics

THE RISK

Low Risk

Why bookstack_get_metrics needs a policy

Retrieving runtime metrics is a read-only operation that queries the current state of the server without creating, modifying, or deleting any data. It poses minimal security risk and falls squarely within the Read category.

From the tool's definition Tool name 'bookstack_get_metrics' with description 'Expose runtime metrics for the BookStack MCP server' indicates retrieval of server performance/health data with no data modification or side effects.

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

POLICY

How to control bookstack_get_metrics

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

policy.json

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

bookstack_get_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 BookStack 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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All 11 BookStack MCP Server tools →

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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 bookstack_get_metrics

What does the bookstack_get_metrics tool do? +

Expose runtime metrics for the BookStack MCP server. It is categorised as a Read tool in the BookStack MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on bookstack_get_metrics? +

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

What risk level is bookstack_get_metrics? +

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

Can I rate-limit bookstack_get_metrics? +

Yes. Add a rate_limit block to the bookstack_get_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 bookstack_get_metrics completely? +

Set action: deny in the PolicyLayer policy for bookstack_get_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 bookstack_get_metrics? +

bookstack_get_metrics is provided by the BookStack MCP Server MCP server (oculairmedia/bookstack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BookStack MCP Server tool call.

Start from BookStack 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 →