fill_form_skill · Playwright MCP HTTP Server MCP

WHAT IT DOES

What fill_form_skill does on Playwright MCP HTTP Server

AI agents invoke fill_form_skill to trigger actions in Playwright MCP HTTP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why fill_form_skill needs a policy

This tool executes browser actions to automatically detect and fill form fields. It triggers external operations (submitting data to web forms) whose effects depend on arguments. Given the sibling tool 'perform_checkout', this form-filling could be part of a financial or purchase flow, raising the blast radius.

From the tool's definition 'fill a form with provided data', 'Uses browser_fill_form internally with automatic field detection', 'browser automation capabilities'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_form_skill Rate-limited

fill_form_skill stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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_skill": {
      "limits": [
        {
          "counter": "fill_form_skill_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about fill_form_skill

What does the fill_form_skill tool do? +

High-level skill to intelligently fill a form with provided data. Uses browser_fill_form internally with automatic field detection. It is categorised as a Execute tool in the Playwright MCP HTTP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fill_form_skill? +

Register the Playwright MCP HTTP Server MCP server in PolicyLayer and add a rule for fill_form_skill: 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 Playwright MCP HTTP Server. Nothing to install.

What risk level is fill_form_skill? +

fill_form_skill is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit fill_form_skill? +

Yes. Add a rate_limit block to the fill_form_skill 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_skill completely? +

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

fill_form_skill is provided by the Playwright MCP HTTP Server MCP server (mcpmessenger/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.