Verify accessibility compliance (Audio Guide / Captions). Checks: 1. Device settings: captions-mode, audio-guide-enabled (via GET :8060/query/device-info) 2. SceneGraph nodes: checks interactive nodes (Button, Label, etc.) for
AI agents call roku_check_accessibility 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 and inspects accessibility configuration and node properties without modifying state, executing commands, or triggering external operations. It is purely informational, examining existing device settings and application structure to assess compliance. The read-only nature and lack of side effects place it in the Read category with low severity.
From the tool's definition Tool performs verification checks by querying device settings (GET :8060/query/device-info) and inspecting SceneGraph nodes for accessibility properties.
Attacks that exploit this kind of access
Verify accessibility compliance (Audio Guide / Captions). Checks: 1. Device settings: captions-mode, audio-guide-enabled (via GET :8060/query/device-info) 2. SceneGraph nodes: checks interactive nodes (Button, Label, etc.) for. 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_check_accessibility: 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_check_accessibility 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_check_accessibility 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_check_accessibility. 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_check_accessibility 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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