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 Mcp Grafana without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries Loki (a log aggregation system) to fetch metadata about available label values within a specified time range. It performs a read-only operation that retrieves information without modifying, deleting, or executing any code. The blast radius of misuse is minimal—an attacker could only discover what label values exist, which is informational and non-destructive.
From the tool's definition Tool description: 'Retrieves all unique values associated with a specific labelName within a Loki datasource and time range'. The verb 'Retrieves' and the read-only nature of querying label values indicate a data retrieval operation with no side effects.
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 Mcp Grafana MCP Server, which means it retrieves data without modifying state.
Register the Mcp Grafana 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 Mcp Grafana. 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 Mcp Grafana MCP server (@leval/mcp-grafana). 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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