Return statistics about the log streams that match a LogQL selector in Loki.
AI agents call query_loki_stats to retrieve information from Grafana FastMCP 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 query against Loki logs to gather statistical information. While querying observability data could theoretically expose sensitive information in logs, the tool itself does not execute code, modify data, or cause irreversible changes. It falls squarely into the Read category as it retrieves and queries data.
From the tool's definition Tool returns statistics about log streams using a LogQL selector with no mutation capability. Description indicates 'return statistics' which is a retrieval operation without side effects.
Documented attack patterns abuse exactly the kind of access query_loki_stats gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Grafana FastMCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for query_loki_stats:
{
"version": "1",
"default": "deny",
"tools": {
"query_loki_stats": {}
}
}query_loki_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Return statistics about the log streams that match a LogQL selector in Loki. It is categorised as a Read tool in the Grafana FastMCP Server MCP Server, which means it retrieves data without modifying state.
Register the Grafana FastMCP Server MCP server in PolicyLayer and add a rule for query_loki_stats: 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 FastMCP Server. Nothing to install.
query_loki_stats 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_loki_stats 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_loki_stats. 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_loki_stats is provided by the Grafana FastMCP Server MCP server (sandersouza/grafanafastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Grafana FastMCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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45 Grafana FastMCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.