describe_supported_languages

THE RISK

Low Risk

Why describe_supported_languages needs a policy

The 'describe_*' pattern in AWS APIs typically denotes read-only operations that retrieve metadata or configuration information without modifying state. This tool appears to return a list of supported languages, which has no side effects and poses minimal risk if invoked by an AI agent. Confidence is lowered slightly due to absence of explicit description.

From the tool's definition Tool name 'describe_supported_languages' indicates a query/retrieval operation that lists supported languages. No description provided, but the naming convention strongly suggests this is a read-only informational query.

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

POLICY

How to control describe_supported_languages

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

policy.json

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

describe_supported_languages 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 EKS 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.

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EXPLORE

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FAQ

Questions about describe_supported_languages

What does the describe_supported_languages tool do? +

describe_supported_languages. It is categorised as a Read tool in the Amazon EKS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on describe_supported_languages? +

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

What risk level is describe_supported_languages? +

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

Can I rate-limit describe_supported_languages? +

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

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

describe_supported_languages is provided by the Amazon EKS MCP Server MCP server (awslabs.eks-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 EKS MCP Server tool call.

Start from Amazon EKS MCP 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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