Query Prometheus using a PromQL expression. Supports both instant and range queries.
AI agents call query_prometheus 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 data from Prometheus without modifying, deleting, or executing arbitrary operations on the underlying system. PromQL queries are read-only operations that extract observability data. While the query could theoretically be malformed or resource-intensive, it does not create, modify, delete, or move data—it only retrieves it. This is a classic Read operation.
From the tool's definition Tool name is 'query_prometheus' and description states 'Query Prometheus using a PromQL expression. Supports both instant and range queries.' The term 'query' combined with 'Prometheus' (a metrics database) and explicit mention of 'query' indicates data…
Attacks that exploit this kind of access
Query Prometheus using a PromQL expression. Supports both instant and range queries. 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: 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 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 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. 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 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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