hash_length

THE RISK

Low Risk

Why hash_length needs a policy

This tool retrieves information about a hash (likely a Redis hash or similar data structure) by returning a count of fields. It performs a non-destructive, read-only query with no side effects. The blast radius if misused is minimal—an agent could only enumerate hash structure information.

From the tool's definition Tool name 'hash_length' and description 'Get number of fields in hash' indicate a query operation that retrieves metadata about a data structure without modifying or executing operations.

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

POLICY

How to control hash_length

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

policy.json

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

hash_length 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 Awslabs Amazon Sns Sqs — 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

More Awslabs Amazon Sns Sqs tools

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All 805 Awslabs Amazon Sns Sqs tools →

Read tools on other servers

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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_length

What does the hash_length tool do? +

Get number of fields in hash. It is categorised as a Read tool in the Awslabs Amazon Sns Sqs MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_length? +

Register the Awslabs Amazon Sns Sqs MCP server in PolicyLayer and add a rule for hash_length: 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 Awslabs Amazon Sns Sqs. Nothing to install.

What risk level is hash_length? +

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

Can I rate-limit hash_length? +

Yes. Add a rate_limit block to the hash_length 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_length completely? +

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

hash_length is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-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 Awslabs Amazon Sns Sqs tool call.

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

CHECK YOUR STACK →