AI agents call get_epub_toc 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 the table of contents (TOC) from EPUB files, which is a read-only operation with no side effects. It extracts metadata without modifying, deleting, or executing anything. The low severity reflects minimal risk—misuse would only expose publicly available book structure information.
From the tool's definition Tool name 'get_epub_toc' and sibling tools like 'get_epub_metadata', 'get_epub_chapter_markdown', 'get_pdf_metadata', and 'get_pdf_toc' all follow a 'get_*' pattern indicating data retrieval operations.
Documented attack patterns abuse exactly the kind of access get_epub_toc 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_toc:
{
"version": "1",
"default": "deny",
"tools": {
"get_epub_toc": {}
}
}get_epub_toc 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_toc. 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_toc: 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_toc 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_toc 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_toc. 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_toc 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.