AI agents call list_rooms 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 retrieves and enumerates room configurations and their associated lighting devices. It performs a read-only discovery operation on local Philips Hue bridge data with no state changes, no code execution, and no destructive actions. The retrieved information (room IDs and member devices) is used by other tools like set_group but list_rooms itself only queries existing data.
From the tool's definition Tool name 'list_rooms' and description 'List rooms with their grouped_light_id...and member devices' indicate a query/retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List rooms with their grouped_light_id (use with set_group) and member devices. 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_rooms: 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_rooms 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_rooms 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_rooms. 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_rooms 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.
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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