crow_calibreweb_add_to_shelf

Add a book to a shelf in Calibre-Web

SERVERCrow SOURCEkh0pper/crow

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/crow-calibreweb-add-to-shelf.md

WHAT IT DOES

What crow_calibreweb_add_to_shelf does on Crow

AI agents use crow_calibreweb_add_to_shelf to create or update resources in Crow, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Crow environment.

RISK

Why crow_calibreweb_add_to_shelf is rated Medium

The tool creates or modifies data (shelf membership in Calibre-Web) without deleting or irreversibly changing state. Adding a book to a shelf can be undone by removing it. This is a straightforward Write category action with minimal blast radius, hence low severity.

From the tool's definition Tool name includes 'add' and description states 'Add a book to a shelf' — this modifies a collection by adding an item, which is a reversible write operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs crow_calibreweb_add_to_shelf 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_add_to_shelf, this is the rule to start with:

crow_calibreweb_add_to_shelf Rate-limited

crow_calibreweb_add_to_shelf stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_calibreweb_add_to_shelf": {
      "limits": [
        {
          "counter": "crow_calibreweb_add_to_shelf_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_add_to_shelf call is checked against it from then on.

FAQ

Questions about crow_calibreweb_add_to_shelf

What does the crow_calibreweb_add_to_shelf tool do? +

Add a book to a shelf in Calibre-Web. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_calibreweb_add_to_shelf? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_calibreweb_add_to_shelf: 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_add_to_shelf? +

crow_calibreweb_add_to_shelf is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit crow_calibreweb_add_to_shelf? +

Yes. Add a rate_limit block to the crow_calibreweb_add_to_shelf 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_add_to_shelf completely? +

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

crow_calibreweb_add_to_shelf 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.

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