AI agents call get_epub_metadata to retrieve information from Ebook without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata from EPUB files, which is a read-only operation with no side effects, data modification, or external execution. The blast radius is minimal—metadata extraction cannot cause harm to the system or data. Low severity reflects the benign nature of reading file metadata.
From the tool's definition Tool name 'get_epub_metadata' and server description indicate data retrieval from e-books; sibling tools like 'get_epub_toc', 'get_pdf_metadata', 'get_pdf_page_text' all perform read-only extraction operations.
Documented attack patterns abuse exactly the kind of access get_epub_metadata gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ebook, and nothing reaches the server without passing your rules. This is the rule we recommend for get_epub_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"get_epub_metadata": {}
}
}get_epub_metadata is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_epub_metadata. It is categorised as a Read tool in the Ebook MCP Server, which means it retrieves data without modifying state.
Register the Ebook MCP server in PolicyLayer and add a rule for get_epub_metadata: 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 Ebook. Nothing to install.
get_epub_metadata 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_epub_metadata 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_epub_metadata. 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_epub_metadata is provided by the Ebook MCP server (onebirdrocks/ebook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Ebook tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Ebook tools catalogued and risk-classified — across an index of 42,500+ MCP servers.