AI agents call list-pdf-metadata to retrieve information from Mcp Pdf Reader without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata information from an already-open PDF file. It performs a read-only operation that queries document properties without creating, modifying, deleting, or executing anything. The metadata returned (such as title, author, creation date, etc.) poses minimal risk even if accessed by an AI agent, as it cannot affect data integrity or trigger external operations.
From the tool's definition Tool name 'list-pdf-metadata' and description 'List metadata of an open PDF' indicate data retrieval with no modification or execution capabilities.
Documented attack patterns abuse exactly the kind of access list-pdf-metadata gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Pdf Reader, and nothing reaches the server without passing your rules. This is the rule we recommend for list-pdf-metadata:
{
"version": "1",
"default": "deny",
"tools": {
"list-pdf-metadata": {}
}
}list-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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List metadata of an open PDF. It is categorised as a Read tool in the Mcp Pdf Reader MCP Server, which means it retrieves data without modifying state.
Register the Mcp Pdf Reader MCP server in PolicyLayer and add a rule for list-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 Mcp Pdf Reader. Nothing to install.
list-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 list-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 list-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.
list-pdf-metadata is provided by the Mcp Pdf Reader MCP server (pietermyb/mcp-pdf-reader). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Pdf Reader, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Mcp Pdf Reader tools catalogued and risk-classified — across an index of 43,000+ MCP servers.