fill_form · PageMap MCP: Risk & Policy

WHAT IT DOES

What fill_form does on PageMap

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

WHY IT NEEDS A POLICY

Why fill_form needs a policy

The name 'fill_form' strongly implies entering data into form fields on a web page, which is a Write/Execute action (modifying page state). However, depending on what the form does, it could trigger more severe actions (e.g., submitting a purchase or deleting data). With no description, confidence is reduced. Among sibling tools, 'execute_action' handles execution, so 'fill_form' likely just populates fields (Write).

From the tool's definition Tool name 'fill_form' — description is empty and uninformative

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_form Rate-limited

fill_form 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_form": {
      "limits": [
        {
          "counter": "fill_form_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about fill_form

What does the fill_form tool do? +

fill_form. It is categorised as a Write tool in the PageMap 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_form? +

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

What risk level is fill_form? +

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

Can I rate-limit fill_form? +

Yes. Add a rate_limit block to the fill_form 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_form completely? +

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

fill_form is provided by the PageMap MCP server (oci:docker.io/retio1001/pagemap:0.7.3). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.