fill_pdf · Pdf Filler Recursive Simple MCP: Risk & Policy

WHAT IT DOES

What fill_pdf does on Pdf Filler Recursive Simple

AI agents use fill_pdf to create or update resources in Pdf Filler Recursive Simple — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pdf Filler Recursive Simple environment.

WHY IT NEEDS A POLICY

Why fill_pdf needs a policy

This tool modifies PDF documents by populating form fields with data and persisting those changes. While reversible (the original can be recovered), it alters files in place and has significant blast radius if an agent fills forms with incorrect, fraudulent, or sensitive data without authorization. The 'save it' component confirms persistent write intent.

From the tool's definition Tool description states it will 'Fill a PDF form with provided data and save it' — a create/modify operation that writes changes to a file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_pdf Rate-limited

fill_pdf 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pdf Filler Recursive Simple, so you can run agents against it safely.

FAQ

Questions about fill_pdf

What does the fill_pdf tool do? +

Fill a PDF form with provided data and save it. It is categorised as a Write tool in the Pdf Filler Recursive Simple MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on fill_pdf? +

Register the Pdf Filler Recursive Simple MCP server in PolicyLayer and add a rule for fill_pdf: 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 Filler Recursive Simple. Nothing to install.

What risk level is fill_pdf? +

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

Can I rate-limit fill_pdf? +

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

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

fill_pdf is provided by the Pdf Filler Recursive Simple MCP server (songminkyu/pdf-filler-recursive-simple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.