Get the page's ARIA snapshot (accessibility tree as YAML). An
AI agents call get_accessibility_tree to retrieve information from WebControl without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns the accessibility tree (ARIA snapshot) in YAML format. It performs no mutations, does not execute code, does not interact with external systems, and does not delete data. It is purely a data retrieval operation, fitting the 'Read' category. Severity is low because misuse would only expose information about page structure, not enable harmful actions or data loss.
From the tool's definition Tool name 'get_accessibility_tree' and description 'Get the page's ARIA snapshot (accessibility tree as YAML)' indicate read-only retrieval of page structure data without modification or side effects.
Attacks that exploit this kind of access
Get the page's ARIA snapshot (accessibility tree as YAML). An. It is categorised as a Read tool in the WebControl MCP Server, which means it retrieves data without modifying state.
Register the WebControl MCP server in PolicyLayer and add a rule for get_accessibility_tree: 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 WebControl. Nothing to install.
get_accessibility_tree 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 get_accessibility_tree 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 get_accessibility_tree. 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.
get_accessibility_tree is provided by the WebControl MCP server (matansht/webcontrol). 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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