page_set_viewport

Set the browser viewport dimensions.

SERVERJshookmcp SOURCE@jshookmcp/jshook

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/io-github-vmoranv-jshookmcp/page-set-viewport.md

WHAT IT DOES

What page_set_viewport does on Jshookmcp

AI agents invoke page_set_viewport to trigger actions in Jshookmcp. 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 page_set_viewport is rated High

Modifies browser state by changing viewport; affects rendering of browser automation sessions.

From the tool's definition Set the browser viewport dimensions

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs page_set_viewport safely

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

page_set_viewport Rate-limited

page_set_viewport 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": {
    "page_set_viewport": {
      "limits": [
        {
          "counter": "page_set_viewport_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 Jshookmcp, apply this rule, and every page_set_viewport call is checked against it from then on.

FAQ

Questions about page_set_viewport

What does the page_set_viewport tool do? +

Set the browser viewport dimensions. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on page_set_viewport? +

Register the Jshook MCP server in PolicyLayer and add a rule for page_set_viewport: 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 Jshookmcp. Nothing to install.

What risk level is page_set_viewport? +

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

Can I rate-limit page_set_viewport? +

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

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

page_set_viewport is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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