crow_kavita_libraries

THE RISK

Low Risk

Why crow_kavita_libraries needs a policy

This tool retrieves and queries library information without modification, deletion, or execution. It has no side effects and returns only informational data about library structure. The blast radius of misuse is minimal—an attacker gains knowledge of library organization but cannot alter, delete, or execute operations.

From the tool's definition Tool name contains 'list' verb; description states 'List all Kavita libraries' with retrieval of metadata (type, folder info)

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

POLICY

How to control crow_kavita_libraries

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

policy.json

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

crow_kavita_libraries 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 Crow — 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 →
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FAQ

Questions about crow_kavita_libraries

What does the crow_kavita_libraries tool do? +

List all Kavita libraries with type and folder info. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on crow_kavita_libraries? +

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

What risk level is crow_kavita_libraries? +

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

Can I rate-limit crow_kavita_libraries? +

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

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

crow_kavita_libraries is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

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

CHECK YOUR STACK →