Get all label names from a Prometheus datasource
AI agents call get_prometheus_labels to retrieve information from Grafana MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves Prometheus label metadata—a read-only operation with no side effects. It does not execute arbitrary code, modify data, delete data, or involve financial operations. The blast radius of misuse is minimal; an attacker could enumerate available metrics/labels but cannot access metric values, modify dashboards, or perform destructive actions.
From the tool's definition Tool name 'get_prometheus_labels' and description 'Get all label names from a Prometheus datasource' indicate a query operation that retrieves metadata without modifying or deleting data.
Attacks that exploit this kind of access
Get all label names from a Prometheus datasource. It is categorised as a Read tool in the Grafana MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Grafana MCP Server MCP server in PolicyLayer and add a rule for get_prometheus_labels: 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 Grafana MCP Server. Nothing to install.
get_prometheus_labels 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 get_prometheus_labels 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 get_prometheus_labels. 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.
get_prometheus_labels is provided by the Grafana MCP Server MCP server (quanticsoul4772/grafana-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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