crow_bookstack_shelves

List all shelves in BookStack with book counts

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-bookstack-shelves.md

WHAT IT DOES

What crow_bookstack_shelves does on Crow

AI agents call crow_bookstack_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_bookstack_shelves is rated Low

This tool retrieves and lists existing shelves from BookStack along with their book counts. The verb 'List' and the absence of any language indicating modification, creation, deletion, or execution confirms this is a read-only operation. The blast radius of misuse is minimal since it only exposes organizational metadata about shelves.

From the tool's definition Tool name 'crow_bookstack_shelves' and description 'List all shelves in BookStack with book counts' indicate a query/retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crow_bookstack_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_bookstack_shelves, this is the rule to start with:

crow_bookstack_shelves Allowed

crow_bookstack_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_bookstack_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_bookstack_shelves call is checked against it from then on.

FAQ

Questions about crow_bookstack_shelves

What does the crow_bookstack_shelves tool do? +

List all shelves in BookStack with book counts. 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_bookstack_shelves? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_bookstack_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_bookstack_shelves? +

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

Can I rate-limit crow_bookstack_shelves? +

Yes. Add a rate_limit block to the crow_bookstack_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_bookstack_shelves completely? +

Set action: deny in the PolicyLayer policy for crow_bookstack_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_bookstack_shelves? +

crow_bookstack_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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