Search the Calibre-Web library by title, author, or keyword. Returns matching books.
AI agents call crow_calibreweb_search 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 data from a library management system without side effects. It performs a search query across book metadata (title, author, keyword) and returns results. This is a straightforward Read operation with minimal security risk, as it only exposes existing library data without the ability to modify, delete, or execute operations.
From the tool's definition Tool name and description indicate it 'Search[es] the Calibre-Web library' and 'Returns matching books' — a pure query operation with no modification, deletion, or execution of external code.
Documented attack patterns abuse exactly the kind of access crow_calibreweb_search 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_calibreweb_search:
{
"version": "1",
"default": "deny",
"tools": {
"crow_calibreweb_search": {}
}
}crow_calibreweb_search is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search the Calibre-Web library by title, author, or keyword. Returns matching books. 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_calibreweb_search: 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_calibreweb_search 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_calibreweb_search 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_calibreweb_search. 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_calibreweb_search 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.
Free to start. No card required.
576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.