Query Prometheus using a PromQL expression. Supports both instant and range queries.
AI agents call query_prometheus 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 retrieves monitoring data from Prometheus through standard query operations. It has no side effects, does not create, modify, or delete data, and does not execute arbitrary code or trigger external operations with unpredictable outcomes. The blast radius of misuse is limited to information disclosure of metrics data.
From the tool's definition Tool name 'query_prometheus' and description 'Query Prometheus using a PromQL expression. Supports both instant and range queries.' indicate data retrieval only. PromQL queries are read-only operations that fetch metrics without modifying state.
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 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 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 Grafana MCP Server. 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 Grafana MCP Server MCP server (0xteamhq/mcp-grafana). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
query_prometheus is one line of Grafana MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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