Inspect SceneGraph node tree of the running app. Roku API: GET http://{host}:8060/query/sgnodes/{mode} Modes: - all: All existing nodes (osref + bscref counts) - roots: Un-parented nodes only (leak detection) - nodes: Specific node by ID (use nodeId param) Options: sizes=true (memory in KB), coun...
AI agents call roku_sg_nodes 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 is a diagnostic/debugging tool that queries internal application state without side effects. It returns information about the running app's node structure, memory usage, and object references. While it provides internal visibility into an app, this is essential for legitimate development and testing workflows on Roku devices.
From the tool's definition The tool performs inspection and querying of SceneGraph node trees via a GET HTTP request. It retrieves node data with optional parameters for filtering (all/roots/nodes modes) and metadata (sizes, count_only).
Attacks that exploit this kind of access
Inspect SceneGraph node tree of the running app. Roku API: GET http://{host}:8060/query/sgnodes/{mode} Modes: - all: All existing nodes (osref + bscref counts) - roots: Un-parented nodes only (leak detection) - nodes: Specific node by ID (use nodeId param) Options: sizes=true (memory in KB), count_only=true Ref: developer.roku.com/docs/developer-program/debugging/debugging-channels.md. 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_sg_nodes: 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_sg_nodes 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_sg_nodes 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_sg_nodes. 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_sg_nodes 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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