get_entity_state · Home Assistant MCP Server MCP

WHAT IT DOES

What get_entity_state does on Home Assistant MCP Server

AI agents call get_entity_state to retrieve information from Home Assistant MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why get_entity_state needs a policy

This tool queries the current state of a Home Assistant entity. There are no side effects, no data modification, no code execution, and no destructive or financial operations. Reading smart home device states is a low-severity information disclosure risk—exposure enables monitoring but not control.

From the tool's definition Tool name is 'get_entity_state'; prefix 'get_' and verb 'retrieve' (implied by French 'Récupère') indicate a read-only query operation. Description is incomplete ('Récupère l') but the name strongly suggests state retrieval without modification.

Attacks that exploit this kind of access

Questions about get_entity_state

What does the get_entity_state tool do? +

Récupère l. It is categorised as a Read tool in the Home Assistant MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_entity_state? +

Register the Home Assistant MCP Server MCP server in PolicyLayer and add a rule for get_entity_state: 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 Home Assistant MCP Server. Nothing to install.

What risk level is get_entity_state? +

get_entity_state is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_entity_state? +

Yes. Add a rate_limit block to the get_entity_state 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.

How do I block get_entity_state completely? +

Set action: deny in the PolicyLayer policy for get_entity_state. 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.

What MCP server provides get_entity_state? +

get_entity_state is provided by the Home Assistant MCP Server MCP server (jonathan97480/mcphomeassistant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.