List metric names in a Prometheus datasource. Retrieves all metric names and filters them using regex.
AI agents call list_prometheus_metric_names to retrieve information from Mcp Grafana without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and lists data from a Prometheus datasource without creating, modifying, deleting, or executing anything. It is a straightforward data retrieval operation with filtering, presenting no risk of data modification, destruction, or code execution. The blast radius of misuse is minimal—an attacker gains visibility into available metrics only.
From the tool's definition Tool description states 'List metric names' and 'Retrieves all metric names', which are read-only query operations with no modification or side effects.
Attacks that exploit this kind of access
List metric names in a Prometheus datasource. Retrieves all metric names and filters them using regex. It is categorised as a Read tool in the Mcp Grafana MCP Server, which means it retrieves data without modifying state.
Register the Mcp Grafana MCP server in PolicyLayer and add a rule for list_prometheus_metric_names: 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 Mcp Grafana. Nothing to install.
list_prometheus_metric_names 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_prometheus_metric_names 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_prometheus_metric_names. 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_prometheus_metric_names is provided by the Mcp Grafana MCP server (@leval/mcp-grafana). 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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