List all proxy hosts configured in NPM
AI agents call list_proxy_hosts to retrieve information from Nginx Proxy Manager MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation that retrieves and displays existing proxy host configurations without modifying, deleting, or executing any actions. It is a read-only operation with minimal blast radius if misused by an AI agent—the only risk would be information disclosure of proxy configuration details, which is low severity.
From the tool's definition Tool name 'list_proxy_hosts' and description 'List all proxy hosts configured in NPM' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all proxy hosts configured in NPM. It is categorised as a Read tool in the Nginx Proxy Manager MCP MCP Server, which means it retrieves data without modifying state.
Register the Nginx Proxy Manager MCP server in PolicyLayer and add a rule for list_proxy_hosts: 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 Nginx Proxy Manager MCP. Nothing to install.
list_proxy_hosts 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 list_proxy_hosts 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 list_proxy_hosts. 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.
list_proxy_hosts is provided by the Nginx Proxy Manager MCP server (verybigsad/nginx-proxy-manager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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