select_page · Chrome Devtools MCP: Risk & Policy

WHAT IT DOES

What select_page does on Chrome Devtools

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

WHY IT NEEDS A POLICY

Why select_page needs a policy

An AI agent can call select_page faster than any human can review — one bad instruction and it creates or modifies resources in Chrome Devtools by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

select_page Rate-limited

select_page 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": {
    "select_page": {
      "limits": [
        {
          "counter": "select_page_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Chrome Devtools, so you can run agents against it safely.

FAQ

Questions about select_page

What does the select_page tool do? +

Select a page as a context for future tool calls. It is categorised as a Write tool in the Chrome Devtools MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on select_page? +

Register the Chrome Devtools MCP server in PolicyLayer and add a rule for select_page: 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 Chrome Devtools. Nothing to install.

What risk level is select_page? +

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

Can I rate-limit select_page? +

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

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

select_page is provided by the Chrome Devtools MCP server (shivamprasad99/chrome-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.