browser_fill

Fill a form field in the browser

SERVERPercepta MCP Server SOURCE0x-hewm/percepta-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0x-hewm-percepta-mcp/browser-fill.md

WHAT IT DOES

What browser_fill does on Percepta MCP Server

AI agents invoke browser_fill to trigger actions in Percepta MCP 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.

RISK

Why browser_fill is rated High

Filling a form field is a browser action that interacts with external web pages. It triggers side effects depending on what form is being filled (e.g., credentials, data submission). This is an Execute-category action as it performs browser automation whose impact depends on arguments. It could be misused to submit sensitive data or interact with forms in unintended ways.

From the tool's definition Fill a form field in the browser

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_fill safely

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

browser_fill Rate-limited

browser_fill 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": {
    "browser_fill": {
      "limits": [
        {
          "counter": "browser_fill_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about browser_fill

What does the browser_fill tool do? +

Fill a form field in the browser. It is categorised as a Execute tool in the Percepta MCP 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 browser_fill? +

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

What risk level is browser_fill? +

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

Can I rate-limit browser_fill? +

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

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

browser_fill is provided by the Percepta MCP Server MCP server (0x-hewm/percepta-mcp). 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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