browser_emulate

Set the visible in-app browser viewport/device emulation for responsive testing.

SERVERCoWork OS SOURCECoWork-OS/CoWork-OS

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/cowork-os/browser-emulate.md

WHAT IT DOES

What browser_emulate does on CoWork OS

AI agents invoke browser_emulate to trigger actions in CoWork OS. 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_emulate is rated High

This tool executes a browser operation that changes viewport/device emulation state. While not destructive or financial, it performs a side-effecting action that modifies the browser's runtime behavior. The effect depends on the emulation parameters provided as arguments.

From the tool's definition Tool description states it 'Set the visible in-app browser viewport/device emulation for responsive testing.' The verb 'set' indicates a configuration change that triggers an action (emulation mode) with external effects on the browser environment.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_emulate safely

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

browser_emulate Rate-limited

browser_emulate 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_emulate": {
      "limits": [
        {
          "counter": "browser_emulate_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 CoWork OS, apply this rule, and every browser_emulate call is checked against it from then on.

FAQ

Questions about browser_emulate

What does the browser_emulate tool do? +

Set the visible in-app browser viewport/device emulation for responsive testing. It is categorised as a Execute tool in the CoWork OS 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_emulate? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for browser_emulate: 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 CoWork OS. Nothing to install.

What risk level is browser_emulate? +

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

Can I rate-limit browser_emulate? +

Yes. Add a rate_limit block to the browser_emulate 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_emulate completely? +

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

browser_emulate is provided by the CoWork OS MCP server (CoWork-OS/CoWork-OS). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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