AI agents call get_hosts_by_group 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 tool queries and retrieves a list of hosts filtered by group membership from the Ansible inventory. It performs a read-only operation that retrieves data without side effects, making it a Read category tool. The severity is low because retrieving inventory information poses minimal risk—it does not execute commands, modify infrastructure, delete data, or move resources.
From the tool's definition Tool name 'get_hosts_by_group' and description 'Get all hosts that belong to a specific group' indicate a query/retrieval operation with no modification or destructive capability.
Attacks that exploit this kind of access
Get all hosts that belong to a specific group. 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 get_hosts_by_group: 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.
get_hosts_by_group 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 get_hosts_by_group 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 get_hosts_by_group. 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.
get_hosts_by_group 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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