Retrieve historical Prometheus metrics for a specific Kubernetes pod or service over a time range.
AI agents call get_metrics_range to retrieve information from K8s Observability MCP 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 for monitoring purposes. It has no side effects, does not modify or delete data, does not execute code or commands, and does not move money. It is a straightforward observability query operation that fits the Read category with low severity due to minimal blast radius — accessing metrics data poses no direct operational risk.
From the tool's definition Tool name includes 'get_' prefix and description states 'Retrieve historical Prometheus metrics' — both indicate data retrieval. The tool queries existing observability data without modification, deletion, or external execution.
Attacks that exploit this kind of access
Retrieve historical Prometheus metrics for a specific Kubernetes pod or service over a time range. It is categorised as a Read tool in the K8s Observability MCP MCP Server, which means it retrieves data without modifying state.
Register the K8s Observability MCP server in PolicyLayer and add a rule for get_metrics_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 K8s Observability MCP. Nothing to install.
get_metrics_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 get_metrics_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 get_metrics_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.
get_metrics_range is provided by the K8s Observability MCP server (martinimarcello00/k8s-observability-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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