Check indexer health and response times
AI agents call health-check to retrieve information from Yarr Media Stack without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves status information about indexers (likely Prowlarr indexers in this media stack context). It performs read-only diagnostics without side effects, making it a Read category tool. The severity is low because health checks cannot cause harm—they simply query existing system state. Confidence is high given the clear, unambiguous description.
From the tool's definition Tool name 'health-check' and description 'Check indexer health and response times' indicate a monitoring/query operation with no data modification or execution of arbitrary code.
Attacks that exploit this kind of access
Check indexer health and response times. It is categorised as a Read tool in the Yarr Media Stack MCP Server, which means it retrieves data without modifying state.
Register the Yarr Media Stack MCP server in PolicyLayer and add a rule for health-check: 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 Yarr Media Stack. Nothing to install.
health-check 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 health-check 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 health-check. 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.
health-check is provided by the Yarr Media Stack MCP server (mcpnexus-registry/yarr). 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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