describe_supported_languages

THE RISK

Low Risk

Why describe_supported_languages needs a policy

The tool name indicates a descriptive/informational query pattern ('describe_*') that retrieves configuration or capability data. This is a read-only operation with no side effects. Confidence is moderate (0.6) due to the empty description, which prevents full verification of intent and actual behavior.

From the tool's definition Tool name 'describe_supported_languages' suggests a query operation that retrieves information about supported languages without modifying state. No description provided to confirm.

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 ECS 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 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.

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EXPLORE

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The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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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 ECS 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 ECS 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 ECS 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 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.

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