查询 Home Assistant 服务的参数信息。如果不确定某个服务需要什么参数，先用此工具查询。支持模糊搜索 domain
AI agents call ha_lookup_service 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.
This tool retrieves metadata about Home Assistant services and their required parameters. It is a read-only operation that queries information without modifying state, executing commands, or causing side effects. The lookup functionality is informational and supportive in nature, helping agents understand what parameters are needed before calling services. No data is modified, deleted, or executed.
From the tool's definition Tool description states '查询 Home Assistant 服务的参数信息' (query Home Assistant service parameter information) and 'supports fuzzy search domain'. The tool performs information lookup and retrieval only.
Attacks that exploit this kind of access
查询 Home Assistant 服务的参数信息。如果不确定某个服务需要什么参数，先用此工具查询。支持模糊搜索 domain. It is categorised as a Read tool in the Home Assistant MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Home Assistant MCP Server MCP server in PolicyLayer and add a rule for ha_lookup_service: 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.
ha_lookup_service 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 ha_lookup_service 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 ha_lookup_service. 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.
ha_lookup_service is provided by the Home Assistant MCP Server MCP server (weyand138-netizen/home-assistant-ai-agent-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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