AI agents call list-live-regions to retrieve information from Aria without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns information from the W3C WAI-ARIA specification about live region roles and their properties. It is purely informational—it retrieves data about accessibility roles without creating, modifying, deleting, or executing any code. The low severity reflects minimal risk: misuse would only return incorrect or irrelevant ARIA documentation, with no impact on systems, data, or user actions.
From the tool's definition Tool name 'list-live-regions' and description 'List all ARIA live region roles and explain their politeness levels' indicate retrieval and presentation of specification data with no modification or side effects.
Attacks that exploit this kind of access
List all ARIA live region roles and explain their politeness levels. It is categorised as a Read tool in the Aria MCP Server, which means it retrieves data without modifying state.
Register the Aria MCP server in PolicyLayer and add a rule for list-live-regions: 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 Aria. Nothing to install.
list-live-regions 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 list-live-regions 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 list-live-regions. 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.
list-live-regions is provided by the Aria MCP server (joe-watkins/aria-mcp). 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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