Run a range PromQL query through Grafana's Prometheus datasource proxy.
AI agents call query_prometheus_range 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 retrieves time-series metrics from Prometheus via a read-only query interface. PromQL range queries are diagnostic reads with no side effects on the system. The server is explicitly positioned as read-only with RBAC authentication controls. Misuse would be limited to information disclosure of metrics.
From the tool's definition Tool name 'query_prometheus_range' and description 'Run a range PromQL query through Grafana's Prometheus datasource proxy' indicate read-only metric querying. Server description explicitly states 'read-only diagnostics' and 'metric queries'.
Attacks that exploit this kind of access
Run a range PromQL query through Grafana's Prometheus datasource proxy. 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 query_prometheus_range: 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.
query_prometheus_range 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_prometheus_range 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_prometheus_range. 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_prometheus_range is provided by the Mcp Grafana MCP server (romaine-life/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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