list_persistent_scripts

THE RISK

Low Risk

Why list_persistent_scripts needs a policy

This tool retrieves and displays information about existing persistent scripts without creating, modifying, deleting, or executing anything. It is a read-only inspection capability, making it a Read category tool with low severity. The confidence is high because the name and description clearly indicate a listing/query operation.

From the tool's definition Tool name 'list_persistent_scripts' and description 'List all registered persistent scripts for the current page. Shows each script' indicate a query/retrieval operation with no modification or side effects.

Documented attack patterns abuse exactly the kind of access list_persistent_scripts gives an agent:

POLICY

How to control list_persistent_scripts

PolicyLayer is an MCP gateway — it sits between your AI agents and ReverseCraft DevTools MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_persistent_scripts:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_persistent_scripts": {}
  }
}

list_persistent_scripts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register ReverseCraft DevTools MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More ReverseCraft DevTools MCP tools

Destructive clear_cookies Clear browser cookies for all sites or a specific domain. Destructive clear_persistent_scripts Remove all registered persistent scripts for the current page at once. This is useful for Destructive clear_script_replacements Remove all script replacement rules for the current page. Destructive remove_persistent_script Remove a previously registered persistent script by its identifier. After removal, the sc Destructive remove_script_replacement Remove a script replacement rule by its ID. Destructive remove_xhr_breakpoint Remove a previously set XHR/Fetch breakpoint by its URL pattern, or remove all XHR breakpo Destructive close_page Closes the page by its index. The last open page cannot be closed. Execute navigate_page Navigates the currently selected page to a URL.

All 46 ReverseCraft DevTools MCP tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_persistent_scripts

What does the list_persistent_scripts tool do? +

List all registered persistent scripts for the current page. Shows each script. It is categorised as a Read tool in the ReverseCraft DevTools MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_persistent_scripts? +

Register the ReverseCraft DevTools MCP server in PolicyLayer and add a rule for list_persistent_scripts: 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 ReverseCraft DevTools MCP. Nothing to install.

What risk level is list_persistent_scripts? +

list_persistent_scripts is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_persistent_scripts? +

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

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

list_persistent_scripts is provided by the ReverseCraft DevTools MCP server (reverse-craft/rc-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every ReverseCraft DevTools MCP tool call.

Start from ReverseCraft DevTools MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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