browser_fill_form

Fill multiple form fields at once

SERVERClaude Mobile SOURCEalexgladkov/claude-in-mobile

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/alexgladkov-claude-in-mobile/browser-fill-form.md

WHAT IT DOES

What browser_fill_form does on Claude Mobile

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

RISK

Why browser_fill_form is rated Medium

This tool creates or modifies data by populating form fields with values. While reversible (forms can typically be cleared or re-edited), it represents a Write action that alters application state. It is not Destructive because form filling is not irreversible—data can be changed or cleared.

From the tool's definition Tool description states it 'Fill[s] multiple form fields at once' on a mobile device. The server context indicates this tool operates within mobile device automation via ADB (Android) and simctl (iOS), allowing direct UI interactions and text input to device…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_fill_form safely

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

browser_fill_form Rate-limited

browser_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": {
    "browser_fill_form": {
      "limits": [
        {
          "counter": "browser_fill_form_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 Claude Mobile, apply this rule, and every browser_fill_form call is checked against it from then on.

FAQ

Questions about browser_fill_form

What does the browser_fill_form tool do? +

Fill multiple form fields at once. It is categorised as a Write tool in the Claude Mobile MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on browser_fill_form? +

Register the Claude Mobile MCP server in PolicyLayer and add a rule for browser_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 Claude Mobile. Nothing to install.

What risk level is browser_fill_form? +

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

Can I rate-limit browser_fill_form? +

Yes. Add a rate_limit block to the browser_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 browser_fill_form completely? +

Set action: deny in the PolicyLayer policy for browser_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 browser_fill_form? +

browser_fill_form is provided by the Claude Mobile MCP server (alexgladkov/claude-in-mobile). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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