list_script_replacements

THE RISK

Low Risk

Why list_script_replacements needs a policy

This tool queries and retrieves information about existing script replacement rules without modifying, creating, deleting, or executing any operations. It is a passive inspection capability that returns state information.

From the tool's definition Tool name 'list_script_replacements' and description 'List all active script replacement rules' indicates a retrieval/query operation with no side effects. The verb 'list' is a classic Read operation pattern.

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

POLICY

How to control list_script_replacements

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_script_replacements:

policy.json

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

list_script_replacements 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_script_replacements

What does the list_script_replacements tool do? +

List all active script replacement rules for the current page. 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_script_replacements? +

Register the ReverseCraft DevTools MCP server in PolicyLayer and add a rule for list_script_replacements: 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_script_replacements? +

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

Can I rate-limit list_script_replacements? +

Yes. Add a rate_limit block to the list_script_replacements 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_script_replacements completely? +

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

list_script_replacements 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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