AI agents call get_book to retrieve information from Lyceum without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays metadata about a book without modifying, deleting, or executing operations. It is a straightforward read operation on the Calibre library with no destructive, financial, or execution implications. The blast radius of misuse is minimal—an agent could only retrieve information already stored in the library.
From the tool's definition Tool name and description indicate retrieval only: 'Get full details for a specific book by ID, including authors, tags, series, formats, and description.' The verb 'Get' and the enumeration of retrieved fields (authors, tags, series, formats, description)…
Attacks that exploit this kind of access
Get full details for a specific book by ID, including authors, tags, series, formats, and description. It is categorised as a Read tool in the Lyceum MCP Server, which means it retrieves data without modifying state.
Register the Lyceum MCP server in PolicyLayer and add a rule for get_book: 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 Lyceum. Nothing to install.
get_book 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 get_book 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 get_book. 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.
get_book is provided by the Lyceum MCP server (matthewp/lyceum). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_book is one line of Lyceum's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →