AI agents call prowlarr_get_history to retrieve information from Nas 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 historical search data from Prowlarr (an indexer manager). It performs a read-only operation that does not modify, delete, or execute any actions. The worst-case misuse scenario would be an agent reviewing search history to understand system behavior, which poses minimal risk. Classified as Read with low severity.
From the tool's definition Tool name 'prowlarr_get_history' and description 'Récupère l'historique des recherches effectuées' (Retrieves the history of searches performed) indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Récupère l'historique des recherches effectuées. It is categorised as a Read tool in the Nas MCP Server, which means it retrieves data without modifying state.
Register the Nas MCP server in PolicyLayer and add a rule for prowlarr_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 Nas. Nothing to install.
prowlarr_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 prowlarr_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 prowlarr_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.
prowlarr_get_history is provided by the Nas MCP server (matthieurosset/nas-mcp-server). 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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