update_pdf_metadata

THE RISK

Medium Risk

Why update_pdf_metadata needs a policy

Updating metadata modifies PDF properties reversibly without deleting data or executing arbitrary code. This falls under Write category. Severity is medium because metadata modifications could alter document provenance, timestamps, or embedded information in ways that affect integrity or compliance, but the operation is reversible and does not destroy data or execute commands.

From the tool's definition Tool name 'update_pdf_metadata' indicates modification of PDF metadata fields. Server description confirms the MCP enables 'PDF manipulation' operations including reversible modifications.

Documented attack patterns abuse exactly the kind of access update_pdf_metadata gives an agent:

POLICY

How to control update_pdf_metadata

PolicyLayer is an MCP gateway — it sits between your AI agents and PDF MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_pdf_metadata:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_pdf_metadata": {
      "limits": [
        {
          "counter": "update_pdf_metadata_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

update_pdf_metadata stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register PDF MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 22 PDF MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_pdf_metadata

What does the update_pdf_metadata tool do? +

update_pdf_metadata. It is categorised as a Write tool in the PDF MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_pdf_metadata? +

Register the PDF MCP Server MCP server in PolicyLayer and add a rule for update_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 PDF MCP Server. Nothing to install.

What risk level is update_pdf_metadata? +

update_pdf_metadata is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_pdf_metadata? +

Yes. Add a rate_limit block to the update_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.

How do I block update_pdf_metadata completely? +

Set action: deny in the PolicyLayer policy for update_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.

What MCP server provides update_pdf_metadata? +

update_pdf_metadata is provided by the PDF MCP Server MCP server (sohaib-2/pdf-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PDF MCP Server tool call.

Start from PDF MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →