hash_random_field_with_values

THE RISK

Low Risk

Why hash_random_field_with_values needs a policy

This tool retrieves random fields and their associated values from a hash data structure. It performs no mutations, side effects, or external operations—it only queries and returns data. This is consistent with the 'Read' category for tools that retrieve or query data without side effects.

From the tool's definition The tool name 'hash_random_field_with_values' and description 'Get random field(s) with their values from hash' both indicate a retrieval operation that fetches data from a hash structure.

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

POLICY

How to control hash_random_field_with_values

PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for hash_random_field_with_values:

policy.json

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

hash_random_field_with_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 Prometheus MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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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 hash_random_field_with_values

What does the hash_random_field_with_values tool do? +

Get random field(s) with their values from hash. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_random_field_with_values? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for hash_random_field_with_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 Prometheus MCP Server. Nothing to install.

What risk level is hash_random_field_with_values? +

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

Can I rate-limit hash_random_field_with_values? +

Yes. Add a rate_limit block to the hash_random_field_with_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 hash_random_field_with_values completely? +

Set action: deny in the PolicyLayer policy for hash_random_field_with_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 hash_random_field_with_values? +

hash_random_field_with_values is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Prometheus MCP Server tool call.

Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →