set_viewport_size

A execute tool on the Playwright MCP server.

SERVERPlaywright MCP Server SOURCEalexrwilliam/playwright-mcp-server

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/alexrwilliam-playwright-mcp-server/set-viewport-size.md

WHAT IT DOES

What set_viewport_size does on Playwright MCP Server

AI agents invoke set_viewport_size to trigger actions in Playwright 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 set_viewport_size is rated High

Based on the tool name and server context (Playwright browser automation), this tool likely sets the viewport dimensions of a browser page. This is a browser action that modifies the state of an active browser session. No description is provided, which lowers confidence. It fits best under Execute as it triggers an external browser operation, though the blast radius is low since it only affects display dimensions.

From the tool's definition Tool name 'set_viewport_size' on a Playwright browser automation server; description is empty and uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_viewport_size safely

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

set_viewport_size Rate-limited

set_viewport_size 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": {
    "set_viewport_size": {
      "limits": [
        {
          "counter": "set_viewport_size_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 Playwright MCP Server, apply this rule, and every set_viewport_size call is checked against it from then on.

FAQ

Questions about set_viewport_size

What does the set_viewport_size tool do? +

set_viewport_size is a execute tool on the Playwright MCP Server MCP server. It is categorised as a Execute tool in the Playwright 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 set_viewport_size? +

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

What risk level is set_viewport_size? +

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

Can I rate-limit set_viewport_size? +

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

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

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

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