AI agents call elgato_control to retrieve information from Yaver without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
ip | string | — | |
on | boolean | — | Turn on/off |
brightness | integer | — | Brightness 0-100 |
temperature | integer | — | Color temp 143-344 (warm to cool) |
Parameters from the server's own tool schema.
Even though elgato_control only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
Control Elgato Key Light — on/off, brightness, color temperature. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.
elgato_control accepts 4 parameters: ip, on, brightness, temperature. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for elgato_control: 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 Yaver. Nothing to install.
elgato_control 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 elgato_control 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 elgato_control. 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.
elgato_control is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.