AI agents call list_ups_devices to retrieve information from Homelab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a simple inventory query that retrieves information about UPS (Uninterruptible Power Supply) devices. It does not create, modify, delete, execute code, or trigger external operations—it merely reads and returns existing data. The low severity reflects minimal risk: querying device inventory could expose device names or configuration details, but cannot cause infrastructure damage or unauthorized changes.
From the tool's definition Tool name 'list_ups_devices' and description 'List all UPS devices configured in the inventory' indicate a retrieval/query operation with no modification or side effects.
Attacks that exploit this kind of access
List all UPS devices configured in the inventory. It is categorised as a Read tool in the Homelab MCP Server, which means it retrieves data without modifying state.
Register the Homelab MCP server in PolicyLayer and add a rule for list_ups_devices: 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 Homelab. Nothing to install.
list_ups_devices 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_ups_devices 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_ups_devices. 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_ups_devices is provided by the Homelab MCP server (myraffy/homelab-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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