AI agents call query_system_stats 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 retrieves monitoring data from Beszel and presents statistics about system performance. It has no side effects, does not modify state, and does not execute commands or perform destructive operations. It is a straightforward read operation querying existing telemetry data.
From the tool's definition Tool description states it 'Query[s] time-series statistics' for 'CPU, memory, disk, and network' — purely data retrieval with no modification, creation, or execution capabilities.
Attacks that exploit this kind of access
Query time-series statistics for a specific system (CPU, memory, disk, network). 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 query_system_stats: 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.
query_system_stats 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 query_system_stats 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 query_system_stats. 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.
query_system_stats 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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