AI agents call radarr_get_history 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 retrieves and displays past download events from Radarr (a movie download manager). It performs a read-only query with no side effects—it does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal, as an AI agent querying this data cannot cause harm beyond potentially viewing metadata about media downloads.
From the tool's definition Tool name 'radarr_get_history' and description 'Show recent Radarr download history (last 20 events)' indicate a retrieval operation that queries historical data without modifying or deleting anything.
Attacks that exploit this kind of access
Show recent Radarr download history (last 20 events). 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 radarr_get_history: 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.
radarr_get_history 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 radarr_get_history 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 radarr_get_history. 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.
radarr_get_history is provided by the Homelab MCP server (nainounen/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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