Submit a URL for asynchronous security analysis. Returns immediately with a task_id. Poll with url_scanner_async_task_status to check progress, then url_scanner_async_task_result to get the scan result. Async counterpart of url_scanner_scan for clients without native MCP Tasks support.
Risk signalsAccepts URL/endpoint input (url)
Part of the PreClick — An MCP Native URL preflight scanning service for autonomous agents server.
Free to start. No card required.
AI agents call url_scanner_async_scan to retrieve information from PreClick — An MCP Native URL preflight scanning service for autonomous agents without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though url_scanner_async_scan only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"url_scanner_async_scan": {}
}
}See the full PreClick — An MCP Native URL preflight scanning service for autonomous agents policy for all 6 tools.
These attack patterns abuse exactly the kind of access url_scanner_async_scan gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Submit a URL for asynchronous security analysis. Returns immediately with a task_id. Poll with url_scanner_async_task_status to check progress, then url_scanner_async_task_result to get the scan result. Async counterpart of url_scanner_scan for clients without native MCP Tasks support.. It is categorised as a Read tool in the PreClick — An MCP Native URL preflight scanning service for autonomous agents MCP Server, which means it retrieves data without modifying state.
Register the PreClick — An MCP Native URL preflight scanning service for autonomous agents MCP server in PolicyLayer and add a rule for url_scanner_async_scan: 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 PreClick — An MCP Native URL preflight scanning service for autonomous agents. Nothing to install.
url_scanner_async_scan 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 url_scanner_async_scan 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 url_scanner_async_scan. 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.
url_scanner_async_scan is provided by the PreClick — An MCP Native URL preflight scanning service for autonomous agents MCP server (https://urlcheck.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 PreClick — An MCP Native URL preflight scanning service for autonomous agents tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.