Scan a URL for accessibility violations
AI agents call scan_url to retrieve information from aria51 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes accessibility data from a URL without modifying, deleting, or executing code on the target system. It is analogous to a linter or security scanner that reports findings. While it sends HTTP requests to retrieve page content, this is a standard read operation. No side effects, data modifications, or irreversible actions are performed.
From the tool's definition Tool description states 'Scan a URL for accessibility violations' — a scanning and detection operation with no modification or execution of external systems.
Attacks that exploit this kind of access
Scan a URL for accessibility violations. It is categorised as a Read tool in the aria51 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the aria51 MCP Server MCP server in PolicyLayer and add a rule for scan_url: 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 aria51 MCP Server. Nothing to install.
scan_url 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 scan_url 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 scan_url. 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.
scan_url is provided by the aria51 MCP Server MCP server (justinleeirizarry/aria51). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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