AI agents call list_systems to retrieve information from Beszel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns system information without side effects. It performs a simple enumeration of monitored systems, making it a Read operation with minimal blast radius. The low severity reflects that unauthorized access to monitoring metadata poses limited immediate harm compared to other categories.
From the tool's definition Tool name 'list_systems' and description 'List all monitored systems in Beszel with their status and metadata' indicate a retrieval operation with no modification or execution of external actions.
Attacks that exploit this kind of access
List all monitored systems in Beszel with their status and metadata. It is categorised as a Read tool in the Beszel MCP Server, which means it retrieves data without modifying state.
Register the Beszel MCP server in PolicyLayer and add a rule for list_systems: 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 Beszel. Nothing to install.
list_systems 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_systems 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_systems. 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_systems is provided by the Beszel MCP server (weeebdev/beszel-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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