fill

Type text into a input, text area or select an option from a <select> element.

SERVERChrome DevTools MCP SOURCEanirbandz/chrome_mcp_devtool

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/anirbandz-chrome-mcp-devtool/fill.md

WHAT IT DOES

What fill does on Chrome DevTools MCP

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

RISK

Why fill is rated Medium

The tool modifies data in form fields (write operation) but the changes are reversible and limited to a single page session. Severity is medium because misuse could lead to unintended form submissions or injection of malicious input into web applications, but the blast radius is contained to the current browser tab's interaction.

From the tool's definition Tool description states it 'Type text into a input, text area or select an option from a <select> element' — this modifies form state and input fields in the live browser, creating reversible changes to DOM elements.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fill safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Chrome DevTools MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For fill, this is the rule to start with:

fill Rate-limited

fill 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": {
      "limits": [
        {
          "counter": "fill_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Chrome DevTools MCP, apply this rule, and every fill call is checked against it from then on.

FAQ

Questions about fill

What does the fill tool do? +

Type text into a input, text area or select an option from a <select> element. It is categorised as a Write tool in the Chrome DevTools MCP 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? +

Register the Chrome DevTools MCP server in PolicyLayer and add a rule for fill: 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 Chrome DevTools MCP. Nothing to install.

What risk level is fill? +

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

Can I rate-limit fill? +

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

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

fill is provided by the Chrome DevTools MCP server (anirbandz/chrome_mcp_devtool). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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Guides

Govern customer-ops agents →Argument validation →Scoped token →