Extracts and converts the main content area of a web page to Markdown format, automatically removing navigation menus, headers, footers, and other peripheral content. Perfect for capturing the core content of articles, blog posts, or documentation pages.
AI agents call get_markdown_summary 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_markdown_summary 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
Extracts and converts the main content area of a web page to Markdown format, automatically removing navigation menus, headers, footers, and other peripheral content. Perfect for capturing the core content of articles, blog posts, or documentation pages. 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_markdown_summary: 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_markdown_summary 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_markdown_summary 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_markdown_summary. 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_markdown_summary 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.