test_tool · MCP Simple Server MCP: Risk & Policy

WHAT IT DOES

What test_tool does on MCP Simple Server

AI agents call test_tool as a supporting operation in MCP Simple Server workflows.

WHY IT NEEDS A POLICY

Why test_tool needs a policy

The description is essentially empty and provides no indication of what the tool does. Given the server's context as a minimal math reference implementation, this is likely a placeholder or stub. With no evidence of read, write, execute, destructive, or financial behavior, 'Other' is most appropriate, with low confidence due to the lack of information.

From the tool's definition Tool name is 'test_tool' and description is merely 'Test tool' — uninformative. Server context only describes math tools (add, multiply), and this tool is not described as performing any meaningful operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

test_tool Rate-limited

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

View as policy code

policy.json

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

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Simple Server, so you can run agents against it safely.

FAQ

Questions about test_tool

What does the test_tool tool do? +

Test tool. It is categorised as a Other tool in the MCP Simple Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on test_tool? +

Register the MCP Simple 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 MCP Simple 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 MCP Simple Server MCP server (oleksandrsirenko/mcp-simple-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.