hash_keys

THE RISK

Low Risk

Why hash_keys needs a policy

This tool performs a read-only operation to enumerate field names from a hash object. There are no side effects, data modifications, code execution, deletions, or financial implications. The blast radius of misuse is minimal—an attacker could learn the structure of hash data but cannot alter or access sensitive values without separate tools. This is a classic Read category operation.

From the tool's definition Tool name 'hash_keys' and description 'Get all field names from hash' indicate a retrieval operation that queries the structure of a hash data structure without modifying it.

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

POLICY

How to control hash_keys

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

policy.json

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

hash_keys 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 Amazon ECS 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 805 Amazon ECS MCP Server 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_keys

What does the hash_keys tool do? +

Get all field names from hash. It is categorised as a Read tool in the Amazon ECS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_keys? +

Register the Amazon ECS MCP Server MCP server in PolicyLayer and add a rule for hash_keys: 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 Amazon ECS MCP Server. Nothing to install.

What risk level is hash_keys? +

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

Can I rate-limit hash_keys? +

Yes. Add a rate_limit block to the hash_keys 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_keys completely? +

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

hash_keys is provided by the Amazon ECS MCP Server MCP server (awslabs.ecs-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 Amazon ECS MCP Server tool call.

Start from Amazon ECS 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 →