search_library

Search the Calibre ebook library. Supports metadata filters (author:Asimov, title:Foundation) and full-text content search. Returns results with epub:// URLs.

SERVERCalibre SOURCE2b3pro/calibre-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/2b3pro-calibre-mcp/search-library.md

WHAT IT DOES

What search_library does on Calibre

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

RISK

Why search_library is rated Low

This tool retrieves and queries data from a Calibre library without creating, modifying, or deleting any data. It supports metadata filtering and full-text search, both passive read operations. The blast radius of misuse is minimal—an agent could only over-search or return unwanted results, not harm the library or commit any irreversible actions.

From the tool's definition Tool description states "Search the Calibre ebook library" and "returns results with epub:// URLs". The function is explicitly a search operation with no modification capability mentioned.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs search_library safely

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

search_library Allowed

search_library 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": {
    "search_library": {}
  }
}

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

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

FAQ

Questions about search_library

What does the search_library tool do? +

Search the Calibre ebook library. Supports metadata filters (author:Asimov, title:Foundation) and full-text content search. Returns results with epub:// URLs. It is categorised as a Read tool in the Calibre MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_library? +

Register the Calibre MCP server in PolicyLayer and add a rule for search_library: 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 Calibre. Nothing to install.

What risk level is search_library? +

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

Can I rate-limit search_library? +

Yes. Add a rate_limit block to the search_library 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 search_library completely? +

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

search_library is provided by the Calibre MCP server (2b3pro/calibre-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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