Chạy Katana để crawl và lấy toàn bộ các URL file JavaScript (.js),
AI agents call katana_download_js to retrieve information from Katana MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool fetches and extracts JavaScript file references from websites through web crawling. While reconnaissance tools can inform malicious activity, the tool itself only performs discovery and retrieval operations. It reads and extracts data from target websites without creating, modifying, or deleting resources.
From the tool's definition Tool description states it crawls and retrieves ('lấy toàn bộ') JavaScript file URLs. The verb 'download' and 'retrieve' indicate data extraction without modification. No side effects, deletion, or code execution on the target system.
Attacks that exploit this kind of access
Chạy Katana để crawl và lấy toàn bộ các URL file JavaScript (.js),. It is categorised as a Read tool in the Katana MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Katana MCP Server MCP server in PolicyLayer and add a rule for katana_download_js: 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 Katana MCP Server. Nothing to install.
katana_download_js 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 katana_download_js 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 katana_download_js. 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.
katana_download_js is provided by the Katana MCP Server MCP server (ngothienan/katana-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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