AI agents call bookstack_list_content to retrieve information from BookStack MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'list' verb unambiguously indicates a retrieval operation with no side effects. In the context of a BookStack management server, listing content fetches existing data without creating, modifying, or deleting anything. Severity is low because reading content poses minimal risk—the blast radius is confined to information disclosure of data the user already has access to.
From the tool's definition Tool name 'bookstack_list_content' uses the verb 'list', which is a read-only retrieval operation. The server description confirms it provides 'full-text search capabilities across all content entities' and CRUD operations, indicating this tool…
Documented attack patterns abuse exactly the kind of access bookstack_list_content gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BookStack MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for bookstack_list_content:
{
"version": "1",
"default": "deny",
"tools": {
"bookstack_list_content": {}
}
}bookstack_list_content is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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bookstack_list_content. It is categorised as a Read tool in the BookStack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the BookStack MCP Server MCP server in PolicyLayer and add a rule for bookstack_list_content: 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 BookStack MCP Server. Nothing to install.
bookstack_list_content 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 bookstack_list_content 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 bookstack_list_content. 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.
bookstack_list_content is provided by the BookStack MCP Server MCP server (oculairmedia/bookstack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from BookStack MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 BookStack MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.