list_supported_languages

THE RISK

Low Risk

Why list_supported_languages needs a policy

This tool retrieves static metadata about the analyzer's capabilities without modifying, executing, or deleting any data. It is informational only, with no blast radius if misused by an agent.

From the tool's definition Tool name 'list_supported_languages' and description 'List all programming languages supported by the analyzer' indicate a retrieval operation with no side effects. The verb 'list' is a classic read operation that queries and returns supported language data.

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

POLICY

How to control list_supported_languages

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

policy.json

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

list_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 Tech Debt 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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Go deeper

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 →
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FAQ

Questions about list_supported_languages

What does the list_supported_languages tool do? +

List all programming languages supported by the analyzer. It is categorised as a Read tool in the Tech Debt MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_supported_languages? +

Register the Tech Debt MCP Server MCP server in PolicyLayer and add a rule for list_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 Tech Debt MCP Server. Nothing to install.

What risk level is list_supported_languages? +

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

Can I rate-limit list_supported_languages? +

Yes. Add a rate_limit block to the list_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 list_supported_languages completely? +

Set action: deny in the PolicyLayer policy for list_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 list_supported_languages? +

list_supported_languages is provided by the Tech Debt MCP Server MCP server (pierrejanineh/techdebtmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tech Debt MCP Server tool call.

Start from Tech Debt 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 →