AI agents call search_documents to retrieve information from Ai Books without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The search_documents tool is purely a retrieval operation. It queries a knowledge library and returns results (document chunks with relevance scores) without creating, modifying, deleting, or executing anything. This is characteristic of Read category tools. The low severity reflects that misuse would only expose information already in the knowledge library, with no destructive or harmful side effects possible.
From the tool's definition Tool performs search operations that retrieve and return data ('Searches for relevant chunks in a knowledge library and returns previews') with no ability to modify, delete, or execute operations.
Attacks that exploit this kind of access
Searches for relevant chunks in a knowledge library and returns previews with relevance scores. It is categorised as a Read tool in the Ai Books MCP Server, which means it retrieves data without modifying state.
Register the Ai Books MCP server in PolicyLayer and add a rule for search_documents: 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 Ai Books. Nothing to install.
search_documents 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 search_documents 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 search_documents. 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.
search_documents is provided by the Ai Books MCP server (nvmtoxic/ai-books-mcp-server). 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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