AI agents call list_structure to retrieve information from Mdbook without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about the mdbook project's structure (chapters, sections, hierarchy) without modifying any content or triggering external operations. It is a read-only query operation with minimal blast radius. Classified as Read/low severity.
From the tool's definition Tool name 'list_structure' and description 'Get the structure of the mdbook project' indicate retrieval of metadata about the book's organization. No modification, execution, or deletion occurs.
Attacks that exploit this kind of access
Get the structure of the mdbook project. It is categorised as a Read tool in the Mdbook MCP Server, which means it retrieves data without modifying state.
Register the Mdbook MCP server in PolicyLayer and add a rule for list_structure: 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 Mdbook. Nothing to install.
list_structure 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 list_structure 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 list_structure. 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.
list_structure is provided by the Mdbook MCP server (mdbook-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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