AI agents call list_elements to retrieve information from Openowl without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to query or enumerate UI elements (likely from the accessibility tree or DOM), which is a read-only operation with no side effects. The empty description lowers confidence slightly, but the name and server context strongly suggest it retrieves element data rather than modifying or executing actions.
From the tool's definition Tool name 'list_elements' indicates retrieval/enumeration of UI elements; server context shows accessibility-tree queries and element inspection capabilities; no modification, deletion, or execution of operations.
Documented attack patterns abuse exactly the kind of access list_elements gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Openowl, and nothing reaches the server without passing your rules. This is the rule we recommend for list_elements:
{
"version": "1",
"default": "deny",
"tools": {
"list_elements": {}
}
}list_elements is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_elements. It is categorised as a Read tool in the Openowl MCP Server, which means it retrieves data without modifying state.
Register the Openowl MCP server in PolicyLayer and add a rule for list_elements: 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 Openowl. Nothing to install.
list_elements 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_elements 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_elements. 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_elements is provided by the Openowl MCP server (mihir-kanzariya/openowl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Openowl, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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40 Openowl tools catalogued and risk-classified — across an index of 43,000+ MCP servers.