crow_calibreweb_shelves

List available shelves (bookshelves/collections) in Calibre-Web

SERVERCrow SOURCEkh0pper/crow

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/crow-calibreweb-shelves.md

WHAT IT DOES

What crow_calibreweb_shelves does on Crow

AI agents call crow_calibreweb_shelves to retrieve information from Crow without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why crow_calibreweb_shelves is rated Low

This tool performs a read-only query operation that retrieves and displays available bookshelves or collections from a Calibre-Web instance. It has no side effects, cannot modify data, and poses minimal security risk. The operation is equivalent to a simple list/fetch action, which falls squarely into the Read category.

From the tool's definition Tool name contains 'list' behavior ('List available shelves') and description explicitly states it retrieves shelf/collection data with no modification or deletion capability.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crow_calibreweb_shelves safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For crow_calibreweb_shelves, this is the rule to start with:

crow_calibreweb_shelves Allowed

crow_calibreweb_shelves is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every crow_calibreweb_shelves call is checked against it from then on.

FAQ

Questions about crow_calibreweb_shelves

What does the crow_calibreweb_shelves tool do? +

List available shelves (bookshelves/collections) in Calibre-Web. 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_calibreweb_shelves? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_calibreweb_shelves: 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_calibreweb_shelves? +

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

Can I rate-limit crow_calibreweb_shelves? +

Yes. Add a rate_limit block to the crow_calibreweb_shelves 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_calibreweb_shelves completely? +

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

crow_calibreweb_shelves 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.

KEEP EXPLORING

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