AI agents call book_source_list to retrieve information from Legado without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'list' is a strong signal of a read-only operation that retrieves or enumerates existing book sources without modification. No side effects are implied. The low severity reflects that listing sources exposes metadata only, with minimal blast radius if misused by an agent.
From the tool's definition Tool name 'book_source_list' suggests retrieval/listing of book sources. The empty description limits certainty, but the naming convention and context (alongside tools like 'book_search', 'book_get_chapters') indicates a query operation.
Documented attack patterns abuse exactly the kind of access book_source_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Legado, and nothing reaches the server without passing your rules. This is the rule we recommend for book_source_list:
{
"version": "1",
"default": "deny",
"tools": {
"book_source_list": {}
}
}book_source_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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book_source_list. It is categorised as a Read tool in the Legado MCP Server, which means it retrieves data without modifying state.
Register the Legado MCP server in PolicyLayer and add a rule for book_source_list: 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 Legado. Nothing to install.
book_source_list 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 book_source_list 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 book_source_list. 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.
book_source_list is provided by the Legado MCP server (joestar817/legado-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Legado, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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31 Legado tools catalogued and risk-classified — across an index of 43,000+ MCP servers.