AI agents call get_pdf_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 PDF files with no side effects. Metadata extraction is a non-destructive read operation. The 'get_' prefix and parallel sibling tools confirm the read-only nature. Severity is low because metadata is typically non-sensitive information and retrieving it has no impact on system state.
From the tool's definition Tool name 'get_pdf_metadata' combined with server description stating it 'extracting metadata...from EPUB and PDF files' and sibling tools like 'get_epub_metadata' that follow the same retrieval pattern.
Documented attack patterns abuse exactly the kind of access get_pdf_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_pdf_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"get_pdf_metadata": {}
}
}get_pdf_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_pdf_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_pdf_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_pdf_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_pdf_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_pdf_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_pdf_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.