Search for a UI element on screen (Roku WebDriver). Roku API: POST http://{host}:9000/v1/session/{id}/element Search strategies: - text: visible text content (e.g.,
AI agents call roku_element to retrieve information from Roku 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 UI element information from a Roku device without modifying state, executing code, or causing side effects. It is a query/search operation that inspects the device's current screen state, fitting the Read category. Low severity because misuse would only reveal visible UI information without enabling unauthorized actions on the device itself.
From the tool's definition Tool description states 'Search for a UI element on screen' with search strategies limited to identifying visual content. Uses Roku WebDriver POST endpoint for element querying without modification or execution capabilities.
Attacks that exploit this kind of access
Search for a UI element on screen (Roku WebDriver). Roku API: POST http://{host}:9000/v1/session/{id}/element Search strategies: - text: visible text content (e.g.,. It is categorised as a Read tool in the Roku MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Roku MCP Server MCP server in PolicyLayer and add a rule for roku_element: 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 Roku MCP Server. Nothing to install.
roku_element 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 roku_element 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 roku_element. 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.
roku_element is provided by the Roku MCP Server MCP server (maskelog/roku-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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