AI agents call fetch_multiple_urls to retrieve information from Web Reader without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and parses web content from multiple URLs, returning Markdown output. It performs no mutations, deletions, code execution, or financial operations. The sibling tools (fetch_url variants) all follow the Read pattern of content retrieval. The mention of bypassing access restrictions in the server description does not elevate the category—the tool itself only reads content, not writes or destroys.
From the tool's definition Tool name 'fetch_multiple_urls' and description '批量获取多个URL的网页内容' (fetch web content from multiple URLs in batch) indicate data retrieval with no modification or deletion capability.
Documented attack patterns abuse exactly the kind of access fetch_multiple_urls gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Web Reader, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_multiple_urls:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_multiple_urls": {}
}
}fetch_multiple_urls is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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批量获取多个URL的网页内容. It is categorised as a Read tool in the Web Reader MCP Server, which means it retrieves data without modifying state.
Register the Web Reader MCP server in PolicyLayer and add a rule for fetch_multiple_urls: 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 Web Reader. Nothing to install.
fetch_multiple_urls 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 fetch_multiple_urls 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 fetch_multiple_urls. 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.
fetch_multiple_urls is provided by the Web Reader MCP server (zacfire/mcp-web-reader). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Web Reader tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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5 Web Reader tools catalogued and risk-classified — across an index of 42,500+ MCP servers.