get_library_state

THE RISK

Low Risk

Why get_library_state needs a policy

This tool retrieves and aggregates status information about media across multiple services (Jellyfin, Sonarr, Radarr). It performs read-only queries to provide a unified view without modifying any state, creating side effects, or executing external operations. The ability for misuse is limited to information disclosure, making it low severity.

From the tool's definition Tool description states it 'Checks if a show/movie exists in Jellyfin, Sonarr/Radarr' - purely a query/status check operation with no modifications, deletions, or execution of commands.

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

POLICY

How to control get_library_state

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

policy.json

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

get_library_state 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 Mediabox 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 get_library_state

What does the get_library_state tool do? +

Unified view of media status. Checks if a show/movie exists in Jellyfin, Sonarr/Radarr, and if it. It is categorised as a Read tool in the Mediabox MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_library_state? +

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

What risk level is get_library_state? +

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

Can I rate-limit get_library_state? +

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

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

get_library_state is provided by the Mediabox MCP server (juancmpdev/mediabox-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mediabox MCP tool call.

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

CHECK YOUR STACK →