hash_random_field

THE RISK

Low Risk

Why hash_random_field needs a policy

This is a read operation that queries data from a hash structure. No data is created, modified, deleted, or executed. The operation is purely informational with no side effects. Low severity because misuse would only expose potentially sensitive hash contents, not cause irreversible harm or external effects.

From the tool's definition Tool returns random field(s) from a hash with no modification capability. Description states 'Get random field(s)' indicating a retrieval operation. Arguments are read-only (key name and count), with no destructive or mutating operations possible.

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

POLICY

How to control hash_random_field

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

policy.json

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

hash_random_field 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 AWS — 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

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about hash_random_field

What does the hash_random_field tool do? +

Get random field(s) from hash. Args: key: The name of the key count: Number of fields to return (optional) Returns: Random field(s) or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_random_field? +

Register the AWS MCP server in PolicyLayer and add a rule for hash_random_field: 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 AWS. Nothing to install.

What risk level is hash_random_field? +

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

Can I rate-limit hash_random_field? +

Yes. Add a rate_limit block to the hash_random_field 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 completely? +

Set action: deny in the PolicyLayer policy for hash_random_field. 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? +

hash_random_field is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AWS tool call.

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

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