list_pyroscope_label_values

THE RISK

Low Risk

Why list_pyroscope_label_values needs a policy

This tool retrieves or enumerates label values from Pyroscope (a profiling datasource in Grafana) without modifying or executing operations. It is a read-only data retrieval operation with no side effects. Severity is low because it only exposes observability metadata. Confidence is 0.85 rather than higher due to the empty description, which limits certainty about actual implementation details.

From the tool's definition Tool name 'list_pyroscope_label_values' indicates retrieval of label values from Pyroscope profiling data. The 'list' prefix and 'values' suffix suggest a query/enumeration operation.

Documented attack patterns abuse exactly the kind of access list_pyroscope_label_values gives an agent:

POLICY

How to control list_pyroscope_label_values

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 list_pyroscope_label_values:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_pyroscope_label_values": {}
  }
}

list_pyroscope_label_values is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Grafana FastMCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_pyroscope_label_values

What does the list_pyroscope_label_values tool do? +

list_pyroscope_label_values. It is categorised as a Read tool in the Grafana FastMCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_pyroscope_label_values? +

Register the Grafana FastMCP Server MCP server in PolicyLayer and add a rule for list_pyroscope_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 FastMCP Server. Nothing to install.

What risk level is list_pyroscope_label_values? +

list_pyroscope_label_values is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_pyroscope_label_values? +

Yes. Add a rate_limit block to the list_pyroscope_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.

How do I block list_pyroscope_label_values completely? +

Set action: deny in the PolicyLayer policy for list_pyroscope_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.

What MCP server provides list_pyroscope_label_values? +

list_pyroscope_label_values 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.

Enforce policy on every Grafana FastMCP Server tool call.

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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