AI agents call multi_url_crawl to retrieve information from Crawl-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and processes content from multiple URLs, consistent with the Read category. It extracts and analyzes web page data without modifying, deleting, or executing code. The empty description lowers confidence slightly, but the naming pattern and sibling tools clearly indicate read-only content retrieval functionality.
From the tool's definition Tool name 'multi_url_crawl' and sibling tools 'crawl_url', 'crawl_url_with_fallback', 'deep_crawl_site', and 'batch_crawl' all perform web content extraction.
Documented attack patterns abuse exactly the kind of access multi_url_crawl gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crawl-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for multi_url_crawl:
{
"version": "1",
"default": "deny",
"tools": {
"multi_url_crawl": {}
}
}multi_url_crawl is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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multi_url_crawl. It is categorised as a Read tool in the Crawl-MCP MCP Server, which means it retrieves data without modifying state.
Register the Crawl- MCP server in PolicyLayer and add a rule for multi_url_crawl: 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 Crawl-MCP. Nothing to install.
multi_url_crawl 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 multi_url_crawl 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 multi_url_crawl. 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.
multi_url_crawl is provided by the Crawl- MCP server (walksoda/crawl-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Crawl-MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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19 Crawl-MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.