Retrieves all unique values associated with a specific labelName within a Loki datasource and time range
AI agents call list_loki_label_values 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 query-only operation against Loki (a log aggregation system) to enumerate unique label values within a specified time range. It has no side effects, does not modify data, and does not execute arbitrary operations.
From the tool's definition Tool name is 'list_loki_label_values' and description states it 'Retrieves all unique values associated with a specific labelName within a Loki datasource and time range'.
Attacks that exploit this kind of access
Retrieves all unique values associated with a specific labelName within a Loki datasource and time range. 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 list_loki_label_values: 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.
list_loki_label_values 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 list_loki_label_values 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 list_loki_label_values. 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.
list_loki_label_values 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.
list_loki_label_values 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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