Get all unique values for a specific label
AI agents call vm_label_values to retrieve information from Victoriametrics without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to retrieve unique label values from a time-series database. It has no side effects, does not execute code or commands, does not modify data, and does not involve financial operations. It is a straightforward data retrieval operation with minimal blast radius if misused by an agent.
From the tool's definition Tool name 'vm_label_values' and description 'Get all unique values for a specific label' indicate a query operation that retrieves label values from VictoriaMetrics without modifying any data.
Attacks that exploit this kind of access
Get all unique values for a specific label. It is categorised as a Read tool in the Victoriametrics MCP Server, which means it retrieves data without modifying state.
Register the Victoriametrics MCP server in PolicyLayer and add a rule for vm_label_values: 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 Victoriametrics. Nothing to install.
vm_label_values 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 vm_label_values 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 vm_label_values. 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.
vm_label_values is provided by the Victoriametrics MCP server (@yincongcyincong/victoriametrics-mcp-server). 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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