test_tool

THE RISK

Low Risk

Why test_tool needs a policy

The description provides no actionable information about what this tool does. Given the server context (HackerNews read-only operations), it is likely benign, but confidence is low due to the vague description. Defaulting to 'Other' with low severity as no side effects can be inferred.

From the tool's definition Tool name: 'test_tool', description: 'A simple test tool' — description is uninformative and does not describe any meaningful action.

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

POLICY

How to control test_tool

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "test_tool": {
      "limits": [
        {
          "counter": "test_tool_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

test_tool gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register HackerNews 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.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about test_tool

What does the test_tool tool do? +

A simple test tool. It is categorised as a Other tool in the HackerNews MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on test_tool? +

Register the HackerNews MCP Server MCP server in PolicyLayer and add a rule for test_tool: 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 HackerNews MCP Server. Nothing to install.

What risk level is test_tool? +

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

Can I rate-limit test_tool? +

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

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

test_tool is provided by the HackerNews MCP Server MCP server (traves-theberge/hackernews-mcp-typescript). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every HackerNews MCP Server tool call.

Start from HackerNews 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 →