AI agents call list_lights to retrieve information from HueMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only enumeration of lighting device status. It has no side effects, does not modify state, execute commands, or destroy data. The blast radius of misuse is minimal—an agent could discover which lights exist and their current state, but cannot control or harm them. Classified as Read with low severity.
From the tool's definition Tool description explicitly states 'List every light on the bridge' — a retrieval operation that queries state (on/off, brightness, colour, owner) without modifying or executing actions.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
List every light on the bridge with on/off state, brightness, colour, and owner. It is categorised as a Read tool in the HueMCP MCP Server, which means it retrieves data without modifying state.
Register the Hue MCP server in PolicyLayer and add a rule for list_lights: 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 HueMCP. Nothing to install.
list_lights 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 list_lights 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 list_lights. 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.
list_lights is provided by the Hue MCP server (mbruton/huemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_lights is one line of Hue's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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