Fetches fully rendered HTML content using a headless browser, including JavaScript-generated content. Essential for modern web applications, single-page applications (SPAs), or any content that requires client-side rendering to be complete.
AI agents call get_rendered_html to retrieve information from MCP Server Fetch TypeScript without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though get_rendered_html only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
Fetches fully rendered HTML content using a headless browser, including JavaScript-generated content. Essential for modern web applications, single-page applications (SPAs), or any content that requires client-side rendering to be complete. It is categorised as a Read tool in the MCP Server Fetch TypeScript MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Fetch TypeScript MCP server in PolicyLayer and add a rule for get_rendered_html: 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 MCP Server Fetch TypeScript. Nothing to install.
get_rendered_html 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 get_rendered_html 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 get_rendered_html. 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.
get_rendered_html is provided by the MCP Server Fetch TypeScript MCP server (tatn/mcp-server-fetch-typescript). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.