List books in BookStack, optionally filtered or sorted
AI agents call crow_bookstack_books to retrieve information from Crow without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about BookStack books without any side effects. The description explicitly states it lists books and permits optional filtering or sorting—both read-only operations. There is no capability to modify, delete, execute, or create data. The blast radius is minimal; misuse would only expose existing book metadata.
From the tool's definition Tool name and description indicate 'List books' with optional filtering/sorting. No modification, deletion, or execution capability described. The verb 'List' is explicitly a Read operation.
Documented attack patterns abuse exactly the kind of access crow_bookstack_books gives an agent:
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_bookstack_books:
{
"version": "1",
"default": "deny",
"tools": {
"crow_bookstack_books": {}
}
}crow_bookstack_books is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List books in BookStack, optionally filtered or sorted. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.
Register the Crow MCP server in PolicyLayer and add a rule for crow_bookstack_books: 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.
crow_bookstack_books is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the crow_bookstack_books 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.
Set action: deny in the PolicyLayer policy for crow_bookstack_books. 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.
crow_bookstack_books 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.
Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.