AI agents call extract_js_files to retrieve information from Js Reverse Analyzer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs passive discovery and extraction of JavaScript file references from web pages—a read-only operation. While the broader server context involves anti-bot bypass and dynamic execution, this specific tool merely retrieves/lists JS files without executing them, modifying data, or triggering external actions.
From the tool's definition Tool name 'extract_js_files' and description '从网页中提取所有 JS 文件' (extract all JS files from webpage) indicates retrieval of static assets without modification or execution. No side effects implied.
Documented attack patterns abuse exactly the kind of access extract_js_files gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Js Reverse Analyzer, and nothing reaches the server without passing your rules. This is the rule we recommend for extract_js_files:
{
"version": "1",
"default": "deny",
"tools": {
"extract_js_files": {}
}
}extract_js_files is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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从网页中提取所有 JS 文件. It is categorised as a Read tool in the Js Reverse Analyzer MCP Server, which means it retrieves data without modifying state.
Register the Js Reverse Analyzer MCP server in PolicyLayer and add a rule for extract_js_files: 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 Analyzer. Nothing to install.
extract_js_files 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 extract_js_files 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 extract_js_files. 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.
extract_js_files is provided by the Js Reverse Analyzer MCP server (sjhhh024-cmyk/spider-js-mcp-skills). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Js Reverse Analyzer, 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.
13 Js Reverse Analyzer tools catalogued and risk-classified — across an index of 43,000+ MCP servers.