Capture a screenshot of the current Roku screen. Roku API: POST http://{host}/plugin_inspect (Basic Auth) Returns: base64-encoded image (JPG/PNG). Only works for sideloaded (dev) apps, not published channels. Ref: developer.roku.com/docs/developer-program/getting-started/developer-setup.md
AI agents call roku_screenshot 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 data (visual state) with no side effects. It does not create, modify, delete, or execute operations. The restriction to sideloaded dev apps further limits its scope. While screenshot data could potentially reveal sensitive information on screen, the tool itself performs only a passive read operation.
From the tool's definition Tool captures a screenshot of the current Roku screen and returns a base64-encoded image. The description explicitly states it is read-only: 'Capture a screenshot' with no modification, deletion, or execution of commands.
Attacks that exploit this kind of access
Capture a screenshot of the current Roku screen. Roku API: POST http://{host}/plugin_inspect (Basic Auth) Returns: base64-encoded image (JPG/PNG). Only works for sideloaded (dev) apps, not published channels. Ref: developer.roku.com/docs/developer-program/getting-started/developer-setup.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_screenshot: 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_screenshot 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_screenshot 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_screenshot. 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_screenshot 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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