AI agents call prowlarr.indexer_list to retrieve information from Arr Stack without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The '_list' suffix conventionally denotes read-only operations that retrieve and return data without modification. Prowlarr indexers are configuration metadata, and listing them has no side effects. Despite the empty description lowering confidence slightly, the name alone is sufficient to categorize this as a Read operation with low blast radius.
From the tool's definition Tool name 'indexer_list' indicates a listing/query operation for indexers in Prowlarr (an indexer management service).
Attacks that exploit this kind of access
prowlarr.indexer_list. It is categorised as a Read tool in the Arr Stack MCP Server, which means it retrieves data without modifying state.
Register the Arr Stack MCP server in PolicyLayer and add a rule for prowlarr.indexer_list: 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 Arr Stack. Nothing to install.
prowlarr.indexer_list 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.indexer_list 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.indexer_list. 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.indexer_list is provided by the Arr Stack MCP server (new-usemame/arr-stack-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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