Lists all frames (including iframes) in the current page as a tree. Shows frame index, name, and URL. Use select_frame to switch execution context to a specific frame.
AI agents call list_frames to retrieve information from JS Reverse Strong MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only observation of the DOM frame hierarchy. It gathers information about page structure (frame index, name, URL) without executing code, modifying state, or triggering side effects. This is consistent with the server's stated purpose of 'browser observation' for reverse engineering workflows. No destructive, write, execute, or financial impact is possible from listing frames alone.
From the tool's definition Tool name 'list_frames' and description 'Lists all frames (including iframes) in the current page as a tree. Shows frame index, name, and URL' indicate retrieval of existing page structure metadata without modification or execution.
Documented attack patterns abuse exactly the kind of access list_frames gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and JS Reverse Strong MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_frames:
{
"version": "1",
"default": "deny",
"tools": {
"list_frames": {}
}
}list_frames is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists all frames (including iframes) in the current page as a tree. Shows frame index, name, and URL. Use select_frame to switch execution context to a specific frame. It is categorised as a Read tool in the JS Reverse Strong MCP MCP Server, which means it retrieves data without modifying state.
Register the JS Reverse Strong MCP server in PolicyLayer and add a rule for list_frames: 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 JS Reverse Strong MCP. Nothing to install.
list_frames is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_frames 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.
Set action: deny in the PolicyLayer policy for list_frames. 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.
list_frames is provided by the JS Reverse Strong MCP server (lwjjike/jsreverser-strong-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from JS Reverse Strong MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
85 JS Reverse Strong MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.