Find series matching label matchers from a Prometheus datasource
AI agents call get_prometheus_series 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 performs a read-only lookup of Prometheus time-series data based on label matching criteria. It queries metrics metadata to help discover available series, which is a non-destructive retrieval operation. No data is created, modified, deleted, or code executed—only information is fetched. This is a standard observability/metrics exploration function with minimal risk profile.
From the tool's definition Tool name 'get_prometheus_series' and description 'Find series matching label matchers from a Prometheus datasource' indicate a query operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
Find series matching label matchers 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_series: 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_series 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_series 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_series. 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_series 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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