Get a list of books in the user\
AI agents call get_user_library to retrieve information from MCP on Vercel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists books belonging to a user, which is a read-only operation with no side effects. It has a low blast radius as misuse would only expose existing user data rather than modify, delete, or execute operations.
From the tool's definition Tool name 'get_user_library' and description 'Get a list of books in the user' indicate a retrieval operation that queries user data without modification or deletion.
Attacks that exploit this kind of access
Get a list of books in the user\. It is categorised as a Read tool in the MCP on Vercel MCP Server, which means it retrieves data without modifying state.
Register the MCP on Vercel MCP server in PolicyLayer and add a rule for get_user_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 MCP on Vercel. Nothing to install.
get_user_library 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_user_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.
Set action: deny in the PolicyLayer policy for get_user_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.
get_user_library is provided by the MCP on Vercel MCP server (prncsclo-create/hardcover-mcp-on-vercel-main). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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