add_date_field

THE RISK

Medium Risk

Why add_date_field needs a policy

This tool creates or adds a new form field to a PDF, which is a reversible modification of document content. It does not delete data (not Destructive), execute arbitrary code (not Execute), move money (not Financial), or merely read data (not Read).

From the tool's definition Tool name 'add_date_field' and description 'Add a date field with format validation to PDF' indicate creation/modification of form fields in a PDF document.

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

POLICY

How to control add_date_field

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

policy.json

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

add_date_field 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 MCP PDF — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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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 →
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FAQ

Questions about add_date_field

What does the add_date_field tool do? +

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

How do I enforce a policy on add_date_field? +

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

What risk level is add_date_field? +

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

Can I rate-limit add_date_field? +

Yes. Add a rate_limit block to the add_date_field 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 add_date_field completely? +

Set action: deny in the PolicyLayer policy for add_date_field. 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 add_date_field? +

add_date_field is provided by the MCP PDF MCP server (rsp2k/mcp-pdf). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP PDF tool call.

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

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